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 Function Body: The function body contains a collection of statements that
define what the function does.

Example
Given below is the source code for a function called max(). This function takes two
parameters num1 and num2 and returns the maximum value between the two:

Function Declarations
/* function returning the max between two numbers */

int max(int num1, int num2)

{
/* local variable declaration */
int result;

if (num1 > num2)
result = num1;
else

result = num2;

return result;
}

A function declaration tells the compiler about a function name and how to call the
function. The actual body of the function can be defined separately.
A function declaration has the following parts:

return_type function_name( parameter list );

For the above defined function max(),the function declaration is as follows:

int max(int num1, int num2);

Parameter names are not important in function declaration, only their type is required, so
the following is also a valid declaration:
int max(int, int);

Function declaration is required when you define a function in one source file and you
call that function in another file. In such case, you should declare the function at the top of the file
calling the function.

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