题解 | #简单计算器#

#include <stdio.h>
#include<string.h>
int main() 
{
    double a,b;//float精度不太够，double可以
    char ch;
    scanf("%lf%c%lf",&a,&ch,&b);
    if(ch=='+')
        printf("%.4lf+%.4lf=%.4lf",a,b,a+b);
    else if(ch=='-')
        printf("%.4lf-%.4lf=%.4lf",a,b,a-b);
    else if(ch=='*')
        printf("%.4lf*%.4lf=%.4lf",a,b,a*b);
    else if(ch=='/')
    {
        if(b==0)
            printf("Wrong!Division by zero!");
        else
            printf("%.4lf/%.4lf=%.4lf",a,b,a/b);;
    }
    else {
        printf("Invalid operation!");
    }


    return 0;
}