6. Functions

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Q) Purpose of Functions

Which of the following best explains the general purpose of using functions?

a) Runs some statements multiple times.
b) Split a large program into smaller, more understandable chunks.
c) Print multiple lines of text the screen at once.
d) Prompt the user to input a value and read in the value.

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Q) Asking Age Function

Which of the following partial function definitions would be best for a function which asks the user their age and returns the answer?

a) int promptUserForAge() {...}
b) int promptUserForAge(int age) {...}
c) void promptUserForAge(int age) {...}
d) string promptUserForAge(string age) {...}

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Q) Why use return?

What is the purpose of a return statement in a function?

a) Print a value to the screen and leave the function.
b) Print a value to the screen and exit the program.
c) Exit the program.
d) Leave a function and pass back a value.

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Q) Variable Scope

Consider the following code:

const int HEIGHT = 10;
void foo() 
{
    cout << "Height is: " << HEIGHT << endl;
}

int main() 
{
    foo();
}

Which is true about the constant HEIGHT?

a) It is in the local scope of main().
b) It is in the global scope.
c) It can be used only inside the function foo().
d) It can be changed by code in either main() or foo().

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Q) What's in scope?

Consider the following code:

void baz() 
{
    int apple = 0;
}

void bar() 
{
    int grape = 0;
    cout << XXXXXX << endl;
    int pear = 0;
}

int main() 
{
    int orange = 0;
    baz();
}

Which of the variables in this code could replace XXXXXX and still have the program compile?

a) grape
b) apple or grape
c) grape or pear
d) apple, grape, or orange

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Answers

b) Split a large program into smaller, more understandable chunks.
a) int promptUserForAge() {...}
d) Leave a function and pass back a value.
b) It is in the global scope.
a) grape