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===Functions===
A function is made up of three parts: its return value, its name, and its arguments.
<lang C>int main(void) //This is the function "main," which takes no arguments and returns a 32-bit signed integer value.
int sum(int a,int b) //This is the function "sum," which takes two integer arguments and returns an integer.</lang>
Note that the variable names listed as arguments when declaring a function are just for convenience. They need not be declared nor defined, nor do they refer to any variables in your program that happen to have the same name. It's only when a function is actually <i>used</i> are the argument variables required to exist.
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