#include <stdio.h>
void addnumbers(int,int);  //prototypes
void subnumbers (int,int);
void multnumbers(int,int);

void main()
{
int mynumber1,mynumber2,mynumber3,mynumber4;

printf("Please enter first value:");
scanf("%d",&mynumber1);
printf("Please enter second value:");
scanf("%d",&mynumber2);
addnumbers(mynumber1,mynumber2);//call function, send mynumber1 and mynumber2

printf("Please enter third value:");
scanf("%d",&mynumber3);
printf("Please enter fourth value:");
scanf("%d",&mynumber4);
addnumbers(mynumber3,mynumber4);	//call function send different values
addnumbers(mynumber1,mynumber3);
subnumbers(mynumber1,mynumber2);	//call subnumbers here
multnumbers(mynumber1,mynumber2);							//call multnumbers here
}

void addnumbers(int a,int b)		//receive mynumber1 and mynumber2 into a and b
{
int total;
total=a + b;
printf("Adding the two numbers gives: %d\n\n",total);
}

void subnumbers(int c,int d)
{
int total;
total=c-d;
printf("Subtracting the two numbers gives: %d\n\n",total);
}

void multnumbers(int a, int b)
{
int total;
total=a * b;
printf("The multiply was: %d\n\n",total);
}