题解 | #简单计算器#

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