#include <stdio.h>
int main()
{
float x,y,result;
char w;
printf("ｲﾙﾗ1=");
scanf("%d",&x);
printf("ｲﾙﾗ2=");
scanf("%d",&y);
printf("ﾗﾖｷ・");
scanf("%c",&w);
switch (w)
{
 case'+':printf("result=%.2f\n",x+y);break;
  case'-':printf("result=%.2f\n",x-y);break;
  case'*':printf("result=%.2f\n",x*y);break;
  case'/':if (y==0) printf("ﾊ菠・ﾐﾎｬ0ｲｻﾄﾜﾗﾊ");
	  else printf("result=%.2f\n",x/y);break;
  default :printf("errot\n");
}
return 0;
}