Test On C Programming Skills! Trivia Quiz

1. Is it true that too many recursive calls may result in stack overflow?

True

False

Too many recursive calls can result in a stack overflow because each recursive call adds a new stack frame to the call stack. If the recursion continues for a large number of times without a base case or proper termination condition, the call stack can become filled with a large number of stack frames, eventually exceeding the stack's capacity. This leads to a stack overflow error, causing the program to terminate abruptly.

Explanation

Too many recursive calls can result in a stack overflow because each recursive call adds a new stack frame to the call stack. If the recursion continues for a large number of times without a base case or proper termination condition, the call stack can become filled with a large number of stack frames, eventually exceeding the stack's capacity. This leads to a stack overflow error, causing the program to terminate abruptly.

2. Malloc( ) allocates memory from the heap and not from the stack

True

False

The malloc() function in C is used to allocate memory dynamically from the heap. The heap is a region of memory that is used for dynamic memory allocation. On the other hand, the stack is a region of memory used for storing local variables and function calls. When memory is allocated using malloc(), it is not allocated on the stack but rather on the heap. Therefore, the statement that malloc() allocates memory from the heap and not from the stack is true.

Explanation

The malloc() function in C is used to allocate memory dynamically from the heap. The heap is a region of memory that is used for dynamic memory allocation. On the other hand, the stack is a region of memory used for storing local variables and function calls. When memory is allocated using malloc(), it is not allocated on the stack but rather on the heap. Therefore, the statement that malloc() allocates memory from the heap and not from the stack is true.

3. The library function used to reverse the string is

Strstr( )

Strrev( )

Revstr( )

None of the above

The correct answer is "strrev( )". This is because the "strrev( )" function is a library function that is commonly used to reverse a string. It takes a string as input and returns the reversed string as output.

Explanation

The correct answer is "strrev( )". This is because the "strrev( )" function is a library function that is commonly used to reverse a string. It takes a string as input and returns the reversed string as output.

4. Predict the output of the following program #include<stdio.h> #include<string.h> void main() { char str[ ]="sales\0\man\0"; printf("%s",str); }

Man

Sales

Sales man

Sales\0man

The program declares a character array "str" and assigns it the value "sales\man\0". The printf statement then prints the value of "str". Since there are no formatting specifiers in the printf statement, it will simply print the string as it is. Therefore, the output of the program will be "sales".

Explanation

The program declares a character array "str" and assigns it the value "sales\man\0". The printf statement then prints the value of "str". Since there are no formatting specifiers in the printf statement, it will simply print the string as it is. Therefore, the output of the program will be "sales".

5. How many times the following program will print "Jamboree"? #include<stdio.h> void main() { printf("\n Jamboree"); main(); }

Infinite number of times

32767 times

65535 times

Till the stact doesn't overflow

The program will print "Jamboree" until the stack doesn't overflow. This is because the main function calls itself recursively without any condition to stop the recursion. As a result, the program will keep printing "Jamboree" indefinitely until the stack memory is exhausted and overflows.

Explanation

The program will print "Jamboree" until the stack doesn't overflow. This is because the main function calls itself recursively without any condition to stop the recursion. As a result, the program will keep printing "Jamboree" indefinitely until the stack memory is exhausted and overflows.

6. Which of the following set of statements is correct?

Typedef long a;extern int a c;

Typedef long a;extern a int c:

Typedef long a;extern a c;

The correct answer is "typedef long a; extern a c;". This is because the first statement declares a typedef for a long integer called "a", and the second statement declares an extern variable of type "a" called "c". This is the correct syntax for declaring a typedef and an extern variable.

Explanation

The correct answer is "typedef long a; extern a c;". This is because the first statement declares a typedef for a long integer called "a", and the second statement declares an extern variable of type "a" called "c". This is the correct syntax for declaring a typedef and an extern variable.

7. Predict the output of the following program #include<stdio.h> void main() { static char *s[ ]={"black","white","pink","violet"}; char **ptr[ ]={s+3,s+2,s+1,s}, ***p; p=ptr; ++p; printf("%s", **p+1); }

Ink

Ack

Ite

Let

The program declares an array of strings named "s" and an array of pointers to pointers to char named "ptr". The array "s" contains the strings "black", "white", "pink", and "violet". The array "ptr" is assigned the addresses of the elements in "s" in reverse order. The pointer "p" is assigned the address of the first element in "ptr". The statement "++p" increments the pointer "p" to point to the next element in "ptr", which is the address of the string "pink". The statement "printf("%s", **p+1)" prints the string starting from the second character of "pink", which is "ink".

Explanation

The program declares an array of strings named "s" and an array of pointers to pointers to char named "ptr". The array "s" contains the strings "black", "white", "pink", and "violet". The array "ptr" is assigned the addresses of the elements in "s" in reverse order. The pointer "p" is assigned the address of the first element in "ptr". The statement "++p" increments the pointer "p" to point to the next element in "ptr", which is the address of the string "pink". The statement "printf("%s", **p+1)" prints the string starting from the second character of "pink", which is "ink".

8. #include<stdio.h> void main() { struct emp { char name[20]; int age; float sal; }; struct emp e={"Tiger"}; printf("\n %d %f",e.age,e.sal); }

0 0.000000

Garbage values

Error

None of the above

When an automatic structure is partially initialized, the remaining elements of the structure are initialized to 0.

Explanation

When an automatic structure is partially initialized, the remaining elements of the structure are initialized to 0.

9. By default a real number is treated as

Float

Double

Long double

Depends on the memory model you are using

By default, a real number is treated as a double. The double data type is a 64-bit floating-point number that can represent a wider range of values with greater precision compared to the float data type. Therefore, when a real number is not explicitly declared with a specific data type, it is assumed to be a double.

Explanation

By default, a real number is treated as a double. The double data type is a 64-bit floating-point number that can represent a wider range of values with greater precision compared to the float data type. Therefore, when a real number is not explicitly declared with a specific data type, it is assumed to be a double.

10. Predict the output of the following program #include<stdio.h> #define SQR(x) (x*x) void main() { int a,b=3; a=SQR(b+2); printf("\n %d",a); }

25

11

Error

Garbage value

Because,on preprocessing the expression becomes a=(3+2*3+2)

Explanation

Because,on preprocessing the expression becomes a=(3+2*3+2)