题解 | 简单计算器

#include <stdio.h>

int main() {
  double a,b=0;
  char c='0';
  while(scanf("%lf%c%lf",&a,&c,&b)!=EOF)
  {
    if(c=='+'||c=='-'||c=='*'||c=='/')
    {if(c=='+')
    printf("%.4lf+%.4lf=%.4lf\n",a,b,a+b);
    else if(c=='-')
   printf("%.4lf-%.4lf=%.4lf\n",a,b,a-b);
   else if(c=='*')
   printf("%.4lf*%.4lf=%.4lf\n",a,b,a*b);
    else if(c=='/')
  { 
    if(b==0)
    printf("Wrong!Division by zero!\n");
    else 
    printf("%.4lf/%.4lf=%.4lf\n",a,b,a/b);
}
}
else 
printf("Invalid operation!\n");
}
    return 0;
}