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Calling a Function
While creating a C function, you give a definition of what the function has to do. To use a
function, you will have to call that function to perform the defined task.
When a program calls a function, the program control is transferred to the called function.
A called function performs a defined task and when its return statement is executed or when its
function-ending closing brace is reached, it returns the program control back to the main program.
To call a function, you simply need to pass the required parameters along with the
function name, and if the function returns a value, then you can store the returned value. For
example:

#include <stdio.h>

/* function declaration */

int max(int num1, int num2);

int main ()

{
/* local variable definition */

int a = 100;
int b = 200;

int ret;

/* calling a function to get max value */
ret = max(a, b);

printf( "Max value is : %d\n", ret );

return 0;

}

/* function returning the max between two numbers */
int max(int num1, int num2)

{
/* local variable declaration */

int result;

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