Function parameters - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are function parameters in C?

Function parameters are variables listed in a function's definition. They act as placeholders for the values (arguments) passed to the function when it is called.

beginner

How do you declare a function with two integer parameters in C?

You write the function name followed by parentheses containing the parameter types and names, for example:

void add(int a, int b) { /* code */ }

beginner

What is the difference between parameters and arguments?

Parameters are the variables in the function definition. Arguments are the actual values you pass to the function when calling it.

beginner

Can a function in C have no parameters? How?

Yes. You can declare a function with empty parentheses or with void inside, like void greet(void). This means the function takes no arguments.

intermediate

What happens if you change a parameter value inside a function?

Changing a parameter inside a function only changes the local copy. The original variable passed as an argument outside the function stays the same.

What keyword do you use to specify a function takes no parameters in C?

A none

B void

C null

D empty

In C, void inside the parentheses means the function takes no parameters.

If a function is declared as int sum(int x, int y), what are x and y?

A Return values

B Arguments

C Parameters

D Constants

x and y are parameters, placeholders for values passed when calling the function.

What happens to the original variable if you change a parameter inside a function?

A Original variable stays the same

B Original variable changes

C Program crashes

D Parameter changes outside the function

Parameters are copies of arguments, so changing them inside the function does not affect the original variable.

How do you call a function named printMessage that takes no parameters?

A printMessage(void);

B printMessage{};

C printMessage[];

D printMessage();

You call a function with empty parentheses if it takes no parameters.

Which of these is a correct function parameter list in C?

A int a, float b

B int a; float b;

C (int a, float b)

D int a float b

Parameters are listed by type and name separated by commas without parentheses or semicolons inside the list.

Explain what function parameters are and how they differ from arguments.

Think about the function definition versus the function call.

Describe what happens when you modify a parameter inside a function in C.

Consider how C handles data passed to functions.