题解 | #简单计算器#

#include <math.h>
#include <stdio.h>

int main() {
   double_t a,b;//要用双精度浮点数
   char ch;
   scanf("%lf%c%lf",&a,&ch,&b);
    switch (ch) {
    case '+':
    printf("%.4lf+%.4lf=%.4lf\n",a,b,a+b);
    break;
    case '-':
    printf("%.4lf-%.4lf=%.4lf\n",a,b,a-b);
    break;
    case '*':
    printf("%.4lf*%.4lf=%.4lf\n",a,b,a*b);
    break;
    case '/':
    if(b==0.0)
    {
        printf("Wrong!Division by zero!\n");
    }
    else {
        printf("%.4lf/%.4lf=%.4lf\n",a,b,a/b);
    }
    break;
    default:
    printf("Invalid operation!\n");
    break;
    }
    return 0;
}