#include <stdio.h>

/* Example program provided by Dr. Christie Ezeife  */
/* The simple program finds the sum of any two given
           integer numbers using one function with only
           global variables used by main.         */

/* We declare the global variables here 	*/

int Num1, Num2, Sum;

/* I declare the function prototype here */
void FindSum(void);

int main(void)
{

	printf("Type the two numbers to add: e.g. 45 20 \t:");
	scanf("%d  %d", &Num1, &Num2);

	/* Here, I should call the function FindSum to get the Sum */
	/* Note the function uses the global variables,		*/ 
	/* Num1, Num2 and Sum and is called without parameters.	*/

	FindSum();

	printf("%d  + %d = %d \n", Num1, Num2, Sum);
        
        return 0;
}  /* end of Main  */

/* Now, I should define the function FindSum, which has no  */
/* formal parameters.					  */ 

void FindSum(void)
{

	Sum = Num1 + Num2;

}   /*  end of function definition for FindSum */