Functions

Question 1

A function is

Answer 1

is a named list of statements.

Question 2

A function definition consists of the new function’s name and a

Answer 2

block of statements. Ex: double CalcPizzaArea() { /* block of statements */ }

Question 3

A function call is

Answer 3

an invocation of a function’s name, causing the function’s statements to execute.

Question 4

The function’s name can be any valid identifier. A block

Answer 4

is a list of statements surrounded by braces.

Question 5

A function may return one value using a

Answer 5

return statement. Below, the ComputeSquare() function is defined to have a return type of int; thus, the function’s return statement must have an expression that evaluates to an int.

return numToSquare * numToSquare;

Question 6

A parameter is a

Answer 6

function input specified in a function definition. Ex: A pizza area function might have diameter as an input.

Question 7

An argument is a

Answer 7

value provided to a function’s parameter during a function call. Ex: A pizza area function might be called as CalcPizzaArea(12.0) or as CalcPizzaArea(16.0).

Write a statement that calls a function named CalcCalories, passing the value 3 as an argument.

CalcCalories(3);

Question 8

A parameter, like a variable declaration,

Answer 8

cannot be an expression.

Question 9

A function definition may have multiple parameters, separated by commas. Parameters are assigned with argument values by position: First parameter with first argument, second with second, etc.

A function definition with no parameters must still have

Answer 9

the parentheses, as in: int DoSomething() { … }. The call must include parentheses, with no argument, as in: DoSomething().

Question 10

Which correctly passes two integer arguments for the function call:
CalcVal(…)?

Answer 10

(99, 45 + 5)

Each argument evaluates to an integer.

Question 11

The number of parameters and arguments must

Answer 11

match

Question 12

A function declaration specifies the function’s

Answer 12

return type, name, and parameters, ending with a semicolon where the opening brace would have gone. A function declaration is also known as a function prototype.

Question 13

Sometimes a function’s last parameter (or last few) should be optional. A function call could then omit the last argument, and instead the program would use a default value for that parameter. A function can have a

Answer 13

default parameter value for the last parameter(s), meaning a call can optionally omit a corresponding argument.

Question 14

For global scope should only ( ) should be declared

Answer 14

constants

Question 15

It is not considered good programming to declare global variables.

Answer 15

True

Question 16

A function can have no parameters, one parameter, or many parameters and can return ________ value(s).

Answer 16

only one

Question 17

The value in this type of variable persists between function calls.

Answer 17

static

Question 18

The value in a ________ variable persists between function calls.

Answer 18

static local

Question 19

A function can only return

Answer 19

one item, not two or more

Question 20

Calling a function basically means

Answer 20

starting the execution of the instructions contained in that module.

Question 21

The int main()function consists mostly of calls to functions just like

Answer 21

a con- tractor issues commands to sub-contractors to come and do their jobs.

Question 22

Sometimes a function may need information “passed”

Answer 22

in order to perform designated tasks.

Question 23

If a function is to find the square root of a number, then it needs that num- ber passed to it by

Answer 23

the calling function.

Question 24

Parameters are the

Answer 24

components of communication between functions.

Question 25

Information is passed to or from a func- tion

Answer 25

through parameters.

Question 26

Notice the call consists

Answer 26

only of the name of the function (not the word void preceding it) followed by the set of parentheses and a semicolon.

printDescription(); // Call to the function

Question 27

The parameters in a function heading are called

Answer 27

formal parameters