ch17-15.c

C语言程序设计上机指导与练习 冶金工业出版社 刘怀亮

#include<stdio.h>
main()
{
   float x,y;
   char op;
   printf("Enter your expression: ");
   scanf("%f%c%f",&x,&op,&y);
   switch(op)
   {
      case '+':
           printf("%.2f+%.2f=0.2f\n",x,y,x+y);break;
      case '-':
           printf("%.2f-%.2f=0.2f\n",x,y,x-y);break;
      case '*':
           printf("%.2f*%.2f=0.2f\n",x,y,x*y);break;
      case '/':
           if(y==0) 
               printf("Division by zero.\n");
           else 
            printf("%0.2f/%0.2f=%0.2f\n",x,y,x/y);
      break;
      default:
         printf("Unknown operater.\n");
   }
}