题解 | #简单计算器#

#include <stdio.h>
#include <string.h>

int main()
{
    double a , b;
    char c ;
    int count = 0;
    scanf("%lf%c%lf",&a,&c,&b);
    char arr[10] = "+-*/";
    int l  = strlen(arr);
   for (int i = 0; i < l; i++)
    {
        if (c != arr[i])
         count++;
       
    }
    if (count == 4)
        printf("Invalid operation!");
    if(c == '+')
    printf("%.4lf+%.4lf=%.4lf",a,b,a + b);
    else if(c == '-')
    printf("%.4lf-%.4lf=%.4lf",a,b,a - b);
    else if(c == '*')
     printf("%.4lf*%.4lf=%.4lf",a,b,a * b);
    else if(c == '/' && b != 0)
    {
       
        printf("%.4lf/%.4lf=%.4lf",a,b,a / b);
    }
    else if(c == '/' && b == 0)
    printf("Wrong!Division by zero!");

    return 0;
}