ch17-17.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> 
#include <conio.h> 
void main() 
{ 
   float num1,num2; 
   char s; 
   clrscr(); 
   printf("Enter a statement please:"); 
   scanf("%f%c%f",&num1,&s,&num2); 
   switch(s) 
   {
      case '+':printf("%.2f%c%.2f=%.2f",num1,s,num2,num1+num2);break; 
      case '-':printf("%.2f%c%.2f=%.2f",num1,s,num2,num1-num2);break; 
      case '*':printf("%.2f%c%.2f=%.2f",num1,s,num2,num1*num2);break; 
      case '/':printf("%.2f%c%.2f=%.2f",num1,s,num2,num1/num2);break; 
      default: printf("Input Error!"); 
   } 
   getch(); 
}