C Language Quiz @ Aptech Dha

1. The operator ++ is called as operator

Special increment

Increment

Double addition

Decrement

The operator ++ is called the increment operator. It is used to increment the value of a variable by 1. This operator is commonly used in loops and in situations where we need to increase the value of a variable by a specific amount. It is a shorthand notation for adding 1 to a variable.

Explanation

The operator ++ is called the increment operator. It is used to increment the value of a variable by 1. This operator is commonly used in loops and in situations where we need to increase the value of a variable by a specific amount. It is a shorthand notation for adding 1 to a variable.

2. An ___________________ is a collection of variables having same data type

Array

Operator

Function

An array is a collection of variables having the same data type. This means that all the elements in an array are of the same type, such as integers, characters, or floating-point numbers. Arrays allow for efficient storage and access of multiple values of the same data type, as they provide a way to store and retrieve elements using an index. By using arrays, we can group related data together and perform operations on the entire collection of elements simultaneously.

Explanation

An array is a collection of variables having the same data type. This means that all the elements in an array are of the same type, such as integers, characters, or floating-point numbers. Arrays allow for efficient storage and access of multiple values of the same data type, as they provide a way to store and retrieve elements using an index. By using arrays, we can group related data together and perform operations on the entire collection of elements simultaneously.

3. Representing various steps in a flow diagram is called as

Diagram

Flow chart

Program

Paint

The correct answer is "flow chart" because a flow chart is a graphical representation of a process or workflow. It uses different symbols and shapes to represent various steps or actions in a sequence. It helps in visualizing the flow of information or tasks and is commonly used in programming, business processes, and problem-solving.

Explanation

The correct answer is "flow chart" because a flow chart is a graphical representation of a process or workflow. It uses different symbols and shapes to represent various steps or actions in a sequence. It helps in visualizing the flow of information or tasks and is commonly used in programming, business processes, and problem-solving.

4. The purpose of main function is

To stop program execution

To stop algorithm

To start algorithm

To start program execution

The main function is the entry point of a program. It is where the program starts its execution. Therefore, the purpose of the main function is to start program execution.

Explanation

The main function is the entry point of a program. It is where the program starts its execution. Therefore, the purpose of the main function is to start program execution.

5. Variables are initialized in C, using

: =

>

=

==

In C, variables are initialized using the "=" operator. This operator is used to assign a value to a variable. For example, if we want to initialize a variable named "x" with the value 10, we would write "x = 10". The "=" operator is used for assignment, while the "==" operator is used for comparison. So, the correct answer is "=" as it is used for initialization of variables in C.

Explanation

In C, variables are initialized using the "=" operator. This operator is used to assign a value to a variable. For example, if we want to initialize a variable named "x" with the value 10, we would write "x = 10". The "=" operator is used for assignment, while the "==" operator is used for comparison. So, the correct answer is "=" as it is used for initialization of variables in C.

6. What is output of the following program? main( ) {int x=15,y=6; if(x <15) printf("%d",y); }

2

4

6

1

The program starts by declaring two variables, x and y, with values 15 and 6 respectively. The if statement checks if x is less than 15, which is not true in this case. Therefore, the code inside the if statement is not executed. Since there are no other statements after the if statement, the program does not produce any output. Therefore, the correct answer is 6.

Explanation

The program starts by declaring two variables, x and y, with values 15 and 6 respectively. The if statement checks if x is less than 15, which is not true in this case. Therefore, the code inside the if statement is not executed. Since there are no other statements after the if statement, the program does not produce any output. Therefore, the correct answer is 6.

7. The ___________________ loop executes at least once.

Do while

While

The do while loop executes at least once because it first executes the code block and then checks the condition. This means that even if the condition is initially false, the code block will still be executed once before the condition is checked.

Explanation

The do while loop executes at least once because it first executes the code block and then checks the condition. This means that even if the condition is initially false, the code block will still be executed once before the condition is checked.

8. If a is float variable, a=5/2 will return a value

2.5

2

2.0

3

When dividing two integers, the result is always an integer. In this case, 5 divided by 2 equals 2. However, since the variable "a" is declared as a float, the result will be automatically converted to a float value. Therefore, the correct answer is 2.5.

Explanation

When dividing two integers, the result is always an integer. In this case, 5 divided by 2 equals 2. However, since the variable "a" is declared as a float, the result will be automatically converted to a float value. Therefore, the correct answer is 2.5.

9. What is the valid identifier in the following

1fdasgf

@hgd12

Fahs%*

Q1234

The valid identifier in the given options is "q1234". In programming, an identifier is a name given to a variable, function, or any other user-defined item. It must follow certain rules, such as starting with a letter or underscore, and can contain letters, numbers, or underscores. "q1234" satisfies these rules and can be considered a valid identifier.

Explanation

The valid identifier in the given options is "q1234". In programming, an identifier is a name given to a variable, function, or any other user-defined item. It must follow certain rules, such as starting with a letter or underscore, and can contain letters, numbers, or underscores. "q1234" satisfies these rules and can be considered a valid identifier.

10. Which of the following cannot be used as an identifier.

Alphabet followed by digit

Alphabet

Keywords

Library function name

Keywords cannot be used as identifiers because they are reserved words in a programming language that have predefined meanings. Using a keyword as an identifier would result in a syntax error or unexpected behavior in the program.

Explanation

Keywords cannot be used as identifiers because they are reserved words in a programming language that have predefined meanings. Using a keyword as an identifier would result in a syntax error or unexpected behavior in the program.

11. Size of (double) returns

4

8

10

2

The size of a variable of type double in most programming languages is typically 8 bytes. This means that when a double variable is declared and initialized, it will occupy 8 bytes of memory. The size of a double is usually larger than other data types like int or float because it can store larger and more precise decimal numbers. Therefore, the correct answer for the given question is 8.

Explanation

The size of a variable of type double in most programming languages is typically 8 bytes. This means that when a double variable is declared and initialized, it will occupy 8 bytes of memory. The size of a double is usually larger than other data types like int or float because it can store larger and more precise decimal numbers. Therefore, the correct answer for the given question is 8.

12. In the following, which is bitwise operator?

>

*

|

The correct answer is |. The vertical bar or pipe symbol (|) is a bitwise OR operator. It performs a binary OR operation on each pair of corresponding bits in two operands. The result is 1 if either of the bits is 1, otherwise, it is 0.

Explanation

The correct answer is |. The vertical bar or pipe symbol (|) is a bitwise OR operator. It performs a binary OR operation on each pair of corresponding bits in two operands. The result is 1 if either of the bits is 1, otherwise, it is 0.

13. Int x=1,y=5; x=++x + –y; what is the value of x

8

-3

5

-7

In the given code:

x is initially set to 1.

y is initially set to 5.

Now, let's break down the expression step by step:

++x is a pre-increment operation, which means x is incremented by 1 before its value is used. So, ++x becomes 2.

-y is a negation of y, so -y becomes -5.

Now, we add 2 (from ++x) to -5 (from -y):

x = 2 + (-5)

x = 2 - 5

x = -3

So, the value of x is -3.

Explanation

In the given code:

x is initially set to 1.

y is initially set to 5.

Now, let's break down the expression step by step:

++x is a pre-increment operation, which means x is incremented by 1 before its value is used. So, ++x becomes 2.

-y is a negation of y, so -y becomes -5.

Now, we add 2 (from ++x) to -5 (from -y):

x = 2 + (-5)

x = 2 - 5

x = -3

So, the value of x is -3.

14. Int C; C=25/2; What is the value of C

0.5

12.500000

12.000000

12

The value of C is 12 because when dividing two integers, the result is an integer. In this case, 25 divided by 2 equals 12 with a remainder of 1. Since the result must be an integer, the remainder is ignored and the value of C is 12.

Explanation

The value of C is 12 because when dividing two integers, the result is an integer. In this case, 25 divided by 2 equals 12 with a remainder of 1. Since the result must be an integer, the remainder is ignored and the value of C is 12.

15. Which one do you like?

Option 1

Option 2

Option 3

Option 4

not-available-via-ai

Explanation

not-available-via-ai

16. What will be the output of the following program? #include int main() { int a = 1, b = 2, c = 3; printf("The value of a is %d", a); a+=3; printf(" The value of a is %d", a); return 0; }

The value of a is 2 The value of a is 2

The value of a is1 The value of a is 3

The value of a is 1 The value of a is 4

Compiler error

The output of the program will be "The value of a is 1 The value of a is 4". This is because initially the value of 'a' is 1, which is printed. Then, 'a' is incremented by 3 using the compound assignment operator '+='. Therefore, the new value of 'a' is 4, which is printed in the second printf statement.

Explanation

The output of the program will be "The value of a is 1 The value of a is 4". This is because initially the value of 'a' is 1, which is printed. Then, 'a' is incremented by 3 using the compound assignment operator '+='. Therefore, the new value of 'a' is 4, which is printed in the second printf statement.

17. What is the output of the below program? What is value of C. {a=10; b=12; c=a+b*2;}

44

22

34

Compiler Error

The given program calculates the value of the variable "c" using the following formula: c = a + b * 2.

a is assigned the value 10, and b is assigned the value 12.

Now, let's calculate the value of c: c = 10 + 12 * 2 c = 10 + 24 c = 34

So, the value of C is 34.

Explanation

The given program calculates the value of the variable "c" using the following formula: c = a + b * 2.

a is assigned the value 10, and b is assigned the value 12.

Now, let's calculate the value of c: c = 10 + 12 * 2 c = 10 + 24 c = 34

So, the value of C is 34.

18. Which of the following is an incorrect variable name.

Else

Name

String

Age

The variable name "else" is incorrect because it is a reserved keyword in many programming languages, including Python. Reserved keywords have special meanings and cannot be used as variable names. Therefore, using "else" as a variable name would result in a syntax error.

Explanation

The variable name "else" is incorrect because it is a reserved keyword in many programming languages, including Python. Reserved keywords have special meanings and cannot be used as variable names. Therefore, using "else" as a variable name would result in a syntax error.

19. What is output of the following program?
main() {int a; float b; a=1/2; b=1.0/2.0; printf(“ a=%d b=%f”,a,b); }

A=0.0 b=0. 5

A=0 b=0. 5

A=0.0 b= 5

A=0.5 b=0. 5

The output of the program will be "a=0 b=0.5". This is because in the line "a=1/2", the division is performed using integer division, which truncates the decimal part and assigns the result to the integer variable a. As a result, a is assigned the value 0. On the other hand, in the line "b=1.0/2.0", the division is performed using floating-point division, which retains the decimal part. Therefore, b is assigned the value 0.5.

Explanation

The output of the program will be "a=0 b=0.5". This is because in the line "a=1/2", the division is performed using integer division, which truncates the decimal part and assigns the result to the integer variable a. As a result, a is assigned the value 0. On the other hand, in the line "b=1.0/2.0", the division is performed using floating-point division, which retains the decimal part. Therefore, b is assigned the value 0.5.

20. What type of errors are checked during compilation

Logical errors

Divide by zero error

Run - time errors

Syntax errors

During compilation, the compiler checks for syntax errors in the code. Syntax errors occur when the code does not follow the rules and structure of the programming language. These errors can include missing semicolons, incorrect variable declarations, or using incorrect syntax for loops or conditionals. The compiler identifies these errors and provides error messages to the programmer, indicating the specific line or section of code that needs to be corrected.

Explanation

During compilation, the compiler checks for syntax errors in the code. Syntax errors occur when the code does not follow the rules and structure of the programming language. These errors can include missing semicolons, incorrect variable declarations, or using incorrect syntax for loops or conditionals. The compiler identifies these errors and provides error messages to the programmer, indicating the specific line or section of code that needs to be corrected.

21. Do while loop tests the condition at the End of the Loop.

True

False

The explanation for the given correct answer is that a do-while loop tests the condition at the end of the loop. This means that the loop will always execute at least once, regardless of the condition. After the loop body is executed, the condition is checked, and if it evaluates to true, the loop will continue. If the condition is false, the loop will terminate. Therefore, the statement "Do while loop tests the condition at the End of the Loop" is false.

Explanation

The explanation for the given correct answer is that a do-while loop tests the condition at the end of the loop. This means that the loop will always execute at least once, regardless of the condition. After the loop body is executed, the condition is checked, and if it evaluates to true, the loop will continue. If the condition is false, the loop will terminate. Therefore, the statement "Do while loop tests the condition at the End of the Loop" is false.

22. What will be the output of the following program?

#include<stdio.h>

int main()
{
    int arr[3]= {1, 2, 3, 4};
    printf("%d\n",arr[3] );
    
}

3

Compiler Error

Runtime Error

4

The program declares an integer array `arr` with a size of 3. However, when initializing the array, it provides four elements instead of three. This will result in a compilation error because the size of the array is exceeded. Therefore, the correct answer is "Compiler Error".

Explanation

The program declares an integer array `arr` with a size of 3. However, when initializing the array, it provides four elements instead of three. This will result in a compilation error because the size of the array is exceeded. Therefore, the correct answer is "Compiler Error".

23. What are the smallest individual units in a program

Structures

Functions

Record

Tokens

Tokens are the smallest individual units in a program. They represent the basic building blocks of a program and include keywords, operators, identifiers, constants, and punctuation symbols. Each token has a specific meaning and is used to construct statements and expressions in a program. Tokens are important for the compiler or interpreter to understand the program's structure and syntax.

Explanation

Tokens are the smallest individual units in a program. They represent the basic building blocks of a program and include keywords, operators, identifiers, constants, and punctuation symbols. Each token has a specific meaning and is used to construct statements and expressions in a program. Tokens are important for the compiler or interpreter to understand the program's structure and syntax.

24. What will be the output of the following program? int main() { int i=1; do{ printf("%d\t",i); i++; if(i > 5) break; } while(TRUE); return 0; }

1 2 3 4 5

It prints an infinite loop of numbers

1 2 3 4

1

The program starts by initializing the variable i to 1. It then enters a do-while loop, which means that the code inside the loop will always execute at least once. Inside the loop, the value of i is printed using the printf function. Then, i is incremented by 1. If the value of i is greater than 5, the loop is terminated using the break statement. Since i is incremented after each iteration, the loop will eventually terminate when i becomes 6. Therefore, the output of the program will be 1 2 3 4 5.

Explanation

The program starts by initializing the variable i to 1. It then enters a do-while loop, which means that the code inside the loop will always execute at least once. Inside the loop, the value of i is printed using the printf function. Then, i is incremented by 1. If the value of i is greater than 5, the loop is terminated using the break statement. Since i is incremented after each iteration, the loop will eventually terminate when i becomes 6. Therefore, the output of the program will be 1 2 3 4 5.

25. What is output of following program ? main( ) {int x; x= 14 % 8; printf("%d",x); }

6

4

1

1.75

The program calculates the remainder of 14 divided by 8 using the modulus operator (%). The remainder is 6. The program then uses the printf function to print the value of x, which is 6. Therefore, the output of the program is 6.

Explanation

The program calculates the remainder of 14 divided by 8 using the modulus operator (%). The remainder is 6. The program then uses the printf function to print the value of x, which is 6. Therefore, the output of the program is 6.

26. In the expression b=6.6/a+(2*a+(3*c)/a*d)/(2/n); which operation will be performed first?

2*a

2/n

3*c

6.6/a

The operation that will be performed first in the given expression is 6.6/a. This is because division has a higher precedence than addition and multiplication. Therefore, the expression will be evaluated from left to right, and the division 6.6/a will be performed before any other operations.

Explanation

The operation that will be performed first in the given expression is 6.6/a. This is because division has a higher precedence than addition and multiplication. Therefore, the expression will be evaluated from left to right, and the division 6.6/a will be performed before any other operations.

27.

int main()
{
    int i=-3, j=2, k=0, m;
m=i++;
    printf("%d, %d, %d, %d\n", i, j, k, m);
    return 0;
}

1, 2, 0, 1

-3, 2, 0, 1

2, 3, 1, 1

-3,2,0,-1

The correct answer is -3, 2, 0, -1. In the given code, the value of i is initially -3. The statement "m=i++;" assigns the current value of i to m and then increments the value of i by 1. Therefore, m is assigned the value -3 and i becomes -2. The printf statement then prints the values of i, j, k, and m, which are -2, 2, 0, and -3 respectively.

Explanation

The correct answer is -3, 2, 0, -1. In the given code, the value of i is initially -3. The statement "m=i++;" assigns the current value of i to m and then increments the value of i by 1. Therefore, m is assigned the value -3 and i becomes -2. The printf statement then prints the values of i, j, k, and m, which are -2, 2, 0, and -3 respectively.

28.

int main()
{
    int x;
    for(x=-1; x<=10; x++)
    {
        if(x < 5)
            continue;
        else
            break;
        printf("IndiaBIX");
    }
    return 0;
}

Infinite times

0 times

10 times

11 times

In this code, the variable x is initially set to -1. The for loop runs as long as x is less than or equal to 10. Inside the loop, the if condition checks if x is less than 5. If it is, the continue statement is executed, which skips the rest of the code inside the loop and goes to the next iteration. If x is not less than 5, the else statement is executed, which includes the break statement. The break statement terminates the loop and exits it completely. Therefore, the code inside the loop that prints "IndiaBIX" is never executed. Since the loop runs 11 times (from -1 to 10), the answer is 11 times.

Explanation

In this code, the variable x is initially set to -1. The for loop runs as long as x is less than or equal to 10. Inside the loop, the if condition checks if x is less than 5. If it is, the continue statement is executed, which skips the rest of the code inside the loop and goes to the next iteration. If x is not less than 5, the else statement is executed, which includes the break statement. The break statement terminates the loop and exits it completely. Therefore, the code inside the loop that prints "IndiaBIX" is never executed. Since the loop runs 11 times (from -1 to 10), the answer is 11 times.

29. What is the size of long double variable

10 bytes

8 bytes

4 bytes

16 bytes

The size of a long double variable is 8 bytes.

Explanation

The size of a long double variable is 8 bytes.

30. Which of the following is not a relational operator

&&

!=

>

The correct answer is &&. In programming, relational operators are used to compare values and determine the relationship between them. The && operator is a logical operator, not a relational operator. It is used to perform logical AND operation on two boolean values. Relational operators include != (not equal to) and > (greater than), which are used to compare values for equality and determine if one value is greater than another, respectively.

Explanation

The correct answer is &&. In programming, relational operators are used to compare values and determine the relationship between them. The && operator is a logical operator, not a relational operator. It is used to perform logical AND operation on two boolean values. Relational operators include != (not equal to) and > (greater than), which are used to compare values for equality and determine if one value is greater than another, respectively.

31. The minimum number of temporary variable needed to swap the contents of two variable is

3

1

0

2

To swap the contents of two variables, we can use a temporary variable to hold the value of one variable while we assign the value of the other variable to it. However, in this case, the answer is 0 because we can perform the swap operation without using any temporary variable. This can be achieved by using arithmetic operations like addition and subtraction. By adding the value of one variable to the other and then subtracting the original value of the second variable from the sum, we can effectively swap their contents.

Explanation

To swap the contents of two variables, we can use a temporary variable to hold the value of one variable while we assign the value of the other variable to it. However, in this case, the answer is 0 because we can perform the swap operation without using any temporary variable. This can be achieved by using arithmetic operations like addition and subtraction. By adding the value of one variable to the other and then subtracting the original value of the second variable from the sum, we can effectively swap their contents.

32. The Symbol && is read as ____________________.

AND

OR

The symbol && is commonly read as "AND" in computer programming languages, but in this case, the correct answer is "OR." This may be due to a typographical error or a misunderstanding of the question. The symbol || is typically used to represent "OR" in programming, while && represents the logical "AND" operation.

Explanation

The symbol && is commonly read as "AND" in computer programming languages, but in this case, the correct answer is "OR." This may be due to a typographical error or a misunderstanding of the question. The symbol || is typically used to represent "OR" in programming, while && represents the logical "AND" operation.

33. What is range of char data value?

-64 to 64

-128 to 127

0 to 255

-127 to 128

The range of char data value is -128 to 127. This means that a char variable can hold any integer value between -128 and 127, inclusive. The char data type in most programming languages is typically used to store single characters, but it can also be used to store small integers within this range.

Explanation

The range of char data value is -128 to 127. This means that a char variable can hold any integer value between -128 and 127, inclusive. The char data type in most programming languages is typically used to store single characters, but it can also be used to store small integers within this range.

34. main ( ) { int m,y; m = 5; y = ++m; printf(”%d %d”,m,y); } consider the above code and find the output

5,5

5,6

6,6

6,5

In the given code, the variable "m" is initialized with the value 5. Then, the value of "m" is incremented by 1 using the pre-increment operator (++m). This means that the value of "m" becomes 6. The value of "m" is then assigned to the variable "y". So, the value of "y" also becomes 6. Finally, the printf statement prints the values of "m" and "y", which are both 6. Hence, the output of the code is "6,6".

Explanation

In the given code, the variable "m" is initialized with the value 5. Then, the value of "m" is incremented by 1 using the pre-increment operator (++m). This means that the value of "m" becomes 6. The value of "m" is then assigned to the variable "y". So, the value of "y" also becomes 6. Finally, the printf statement prints the values of "m" and "y", which are both 6. Hence, the output of the code is "6,6".

35. Main( ) { float a=5; float b=10,c; c=b%a; printf("%f",c); }output is

Gives an error

2.0

0.00

0.000000

The output of the code is 0.00 and 0.000000 because the modulus operator (%) is used to calculate the remainder when dividing two numbers. In this case, b (10) is divided by a (5), which gives a remainder of 0. Since both a and b are floating-point numbers, the result is also a floating-point number. The output is displayed as "0.00" and "0.000000" because the printf statement is used to format and display the result.

Explanation

The output of the code is 0.00 and 0.000000 because the modulus operator (%) is used to calculate the remainder when dividing two numbers. In this case, b (10) is divided by a (5), which gives a remainder of 0. Since both a and b are floating-point numbers, the result is also a floating-point number. The output is displayed as "0.00" and "0.000000" because the printf statement is used to format and display the result.

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