khuang8493
6/20/2018 - 12:25 AM

Function in C

How to use functions.

Functions:

1. Declare functions:

Declare all functions before "main".

Declare them like this:

return-type name(argument-list);

example: 

int add(int a, int b, int c); // in the argument list need to declare variable types for each input. Sometimes we give meaningful names to each input as well.

Sometimes a function has no input, so we put "void" instead of argument list:

int name(void);

Sometimes a function can have no output, so put "void" before the function name:

void name(char c, char d);

2. Write inside the function:

float mul_two_floats(float a, float b)

{

	float product = a * b;
	
	return product;
	
}


3. Declare all the functions before "main", but put the codes of all functions after "main".