#include <stdio.h>
#include <stdlib.h>
main()
{
int add(int, int);
int sub(int, int);
int mul(int, int);
int division(int, int);
int a=100;
int b=20;
int c,operation;
printf(" 1. add operation\n");
printf(" 2. sub operation\n");
printf(" 3. mul operation\n");
printf(" 4. div operation\n");
printf(" Please input your choice :");
scanf("%d",&operation);
printf(" input two number:");
scanf("%d %d",&a,&b);
switch (operation)
{
case 1: c=add(a,b);
printf("a+b ===--> %d\n",c);
break;
case 2: c=sub(a,b);
printf("a-b ===--> %d\n",c);
break;
case 3: c=mul(a,b);
printf("a*b ===--> %d\n",c);
break;
case 4: c=division(a,b);
printf("a/b ===--> %d\n",c);
break;
}
system("pause");
}
int add(int x, int y)
{
return (x+y);
}
int sub(int x, int y)
{
return (x-y);
}
int mul(int x, int y)
{
return (x*y);
}
int division(int x, int y)
{
return (x/y);
}