C++ Quiz 4

2.

When parameters are passed between the calling code and the called function, parameters and arguments are matched by:

Their data types
Their relative positions in the parameter and argument lists
Their names
They are not matched up at all.

Correct Answer

A. Their relative positions in the parameter and argument lists

Explanation

When parameters are passed between the calling code and the called function, the matching of parameters and arguments is based on their relative positions in the parameter and argument lists. This means that the first parameter in the function's parameter list will be matched with the first argument in the calling code's argument list, the second parameter will be matched with the second argument, and so on. The matching is done based on the order in which the parameters and arguments are defined, regardless of their names or data types.

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3.

If you have the two functions as shown, int someFunction(int value); float someFunction(float value); and a variable x, which is a double, which function is called by the following statement? cout << someFunction(x);

Void someFunction(int value);
Void someFunction(float value);
Nothing, it is a syntax error
Both functions are called

Correct Answer

A. Nothing, it is a syntax error

Explanation

The statement cout

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4.

Which of the following are valid function calls to the fabs function?

Fabs(3.5);
Cout
Cin >> fabs(3.5);
Fabs(cin >> x);
Fabs(3.5); and cout > fabs(3.5);
Fabs(3.5); and cout

Correct Answer

A. Fabs(3.5); and cout

Explanation

The function call fabs(3.5) is valid because it calls the fabs function with the argument 3.5, which returns the absolute value of 3.5. The function call cout is also valid because it is used to output data to the console. However, the other function calls are not valid. The function call cin >> fabs(3.5) is invalid because the cin function is used for input, not for calling a function. The function call fabs(cin >> x) is also invalid because it tries to use the cin function as an argument for the fabs function, which is not allowed. The function call cout > fabs(3.5) is invalid because the > operator is used instead of the

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5.

The functions pow(), sqrt(), and fabs() are found in which include file?

Cstdlib
Cmath
Iostream
Regular

Correct Answer

A. Cmath

Explanation

The functions pow(), sqrt(), and fabs() are found in the cmath include file.

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6.

The expression static_cast<double>(3) is called a

Type cast
Multiplier
Doubler
Polymorphism

Correct Answer

A. Type cast

Explanation

The expression static_cast(3) is called a type cast because it is used to explicitly convert the value 3 to the type double. Type casting allows for the conversion of one data type to another, and in this case, the integer value 3 is being converted to a double value. This is done by using the static_cast operator followed by the desired data type in angle brackets.

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7.

If the variable x has the original value of 3.4, what is the value in x after the following? cout << static_cast<int>(x);

3.4
4
Unknown
3

Correct Answer

A. 3

Explanation

The static_cast(x) statement converts the value of x to an integer. Since x has the original value of 3.4, it will be converted to the nearest integer, which is 3. Therefore, the value in x after the statement is 3.

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8.

What is the value of the following? sqrt(sqrt(pow(2,4)));

1
2
4
16

Correct Answer

A. 2

Explanation

The given expression calculates the square root of the square root of 2 raised to the power of 4. First, 2 raised to the power of 4 is calculated, which equals 16. Then, the square root of 16 is taken, resulting in 4. Finally, the square root of 4 is calculated, which equals 2. Therefore, the value of the expression is 2.

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9.

Using functions in a program is known as

Data abstraction
Procedural abstraction
Poor programming style
Calculus

Correct Answer

A. Procedural abstraction

Explanation

Procedural abstraction refers to the practice of using functions in a program. Functions allow us to break down complex tasks into smaller, more manageable parts, making the code easier to understand and maintain. By encapsulating a set of instructions within a function, we can reuse that code whenever needed, improving code reusability and reducing redundancy. Therefore, the correct answer is procedural abstraction.

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10.

Which of the following are valid function calls to the pow function?

Pow(int x, int y);
Pow(2);
Pow(1.1,3.0);
Double pow(1.1,3.0);

Correct Answer

A. Pow(1.1,3.0);

Explanation

The only valid function call to the pow function is pow(1.1,3.0). This is because the pow function takes two arguments, both of which must be of type int or double. The first function call pow(int x, int y) is invalid because it does not provide the required second argument. The second function call pow(2) is also invalid because it does not provide the required first argument. The fourth function call double pow(1.1,3.0) is invalid because it includes the data type "double" before the function name, which is not allowed.

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11.

If you have the following variable declaration in your program, const int SIZE=34; then which of the following statements are legal?

SIZE ++;
X = SIZE--;
Cout
Cin >> SIZE;

Correct Answer

A. Cout

Explanation

The statement "cout" is legal because it is used to display the value of the variable SIZE.

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12.

Which of the following functions is a properly overloaded function of the following? int doSomething(int first, float second);

Float doSomething(int first, float second);
Int doSomething( int next, float last);
Int doSomething(int first, int second, float third);
Int doSome(int first, float second);

Correct Answer

A. Int doSomething(int first, int second, float third);

Explanation

The correct answer is "int doSomething(int first, int second, float third)" because it has the same function name "doSomething" and the same parameter types "int, int, float" as the original function. Overloading a function means creating a new function with the same name but different parameters.

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13.

Which of the following are not legal function declarations?

Int ave3(int a, int b, int c);
Int 3ave(int a, int b, int c);
Int ave3(int, int, int);
Int ave_3(int a1, int a2, int a3);

Correct Answer

A. Int 3ave(int a, int b, int c);

Explanation

The function declaration "int 3ave(int a, int b, int c);" is not legal because function names cannot start with a number.

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14.

Information Hiding is analogous to using

An algorithmic design
A black-box methodology
Formal parameters
Actual parameters

Correct Answer

A. A black-box methodology

Explanation

Information hiding is a concept in software engineering that suggests hiding the implementation details of a module or component from other parts of the system. This is similar to using a black-box methodology, where the internal workings of the system are hidden and only the inputs and outputs are visible. By using a black-box methodology, the details of how the system functions are abstracted away, allowing for easier understanding and maintenance of the system as a whole. Similarly, information hiding allows for better modularization and encapsulation of code, making it easier to modify and maintain.

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C++ Quiz 4

What is the output of the following program fragment? cout << static_cast<double>(3)/4 << endl;

Quiz Preview

When parameters are passed between the calling code and the called function, parameters and arguments are matched by:

If you have the two functions as shown, int someFunction(int value); float someFunction(float value); and a variable x, which is a double, which function is called by the following statement? cout << someFunction(x);

Which of the following are valid function calls to the fabs function?

The functions pow(), sqrt(), and fabs() are found in which include file?

The expression static_cast<double>(3) is called a

If the variable x has the original value of 3.4, what is the value in x after the following? cout << static_cast<int>(x);

What is the value of the following? sqrt(sqrt(pow(2,4)));

Using functions in a program is known as

Which of the following are valid function calls to the pow function?

If you have the following variable declaration in your program, const int SIZE=34; then which of the following statements are legal?

Which of the following functions is a properly overloaded function of the following? int doSomething(int first, float second);

Which of the following are not legal function declarations?

Information Hiding is analogous to using