题解 | #简单计算器#

#include <stdio.h>
#include <stdio.h>
int main()
{
    double a, b;
    char f;
    scanf("%lf %c %lf", &a, &f, &b);
    //判断部分
    if (f == '+' || f == '-' || f == '*' || f == '/')
    {
        switch (f)
        {
        case '+':
            printf("%.4lf+%.4lf=%.4f", a, b, a + b);
            break;
        case '-':
            printf("%.4lf-%.4lf=%.4f", a, b, a - b);
            break;
        case '*':
            printf("%.4lf*%.4lf=%.4f", a, b, a*b);
            break;

        case '/':
            if (b == 0)
            {
                printf("Wrong!Division by zero!");
            }
            else
                printf("%.4lf/%.4lf=%.4f", a, b, a / b);
            break;
        }
    }
    else
        printf("Invalid operation!");
   return 0;
}