/* functions in C
write a function that has two integer parameters and returns their sum
test function in the loop, in the printf statement, and for calculating an 
average */


#include<stdio.h>
int sum(int a, int b); //function prototype int sum(int, int);


int main(){
	int i,n1, n2, func_result;
	//calling function in the loop
	//we will read 5 pairs (n1, n2) and find their sum
	printf("enter 5 pairs of integers\n");
	for(i=0;i<5;i++){
		scanf("%d%d",&n1,&n2);
		func_result=sum(n1,n2);
		printf("%d + %d = %d\n", n1, n2, func_result);
	}
	//calling function in printf statement
	printf("enter 2 integeres\n");
	scanf("%d%d",&n1,&n2);
	printf("%d + %d = %d\n",n1,n2,sum(n1,n2));

	//calculating average of two numbers
	printf("average of %d and %d is %f\n",n1,n2,(float)(sum(n1,n2))/2);
	return 0;

}


//function definition
int sum(int a, int b){
	return (a+b);

	/* int result=a+b;
	   return result;
	*/
}