实验2

#include <stdio.h>
int main() 
{
   int x, y;
   int r1, r2, r3, r4;
   x = 1;
   y = 2;
   r1 = x + y;
   r2 = x - y; r3 = x * y;
   r4 = x / y; 
   printf("r1 = %d\n", r1); 
   printf("r2 = %d\n", r2);
   printf("r3 = %d\n", r3);
   printf("r4 = %d\n", r4);
   return 0;
}

#include <stdio.h>
int main() 
{
   float x, y;
   float r1, r2, r3, r4;
   x = 1;
   y = 2;
   r1 = x + y;
   r2 = x - y; r3 = x * y;
   r4 = x / y; 
   printf("r1 = %f\n", r1); 
   printf("r2 = %f\n", r2);
   printf("r3 = %f\n", r3);
   printf("r4 = %f\n", r4);
   return 0;
}