switch-case

#include<cstdio>
int main(){
    double a,b;char c;
    scanf("%lf %lf %c",&a,&b,&c);
    switch(c){
        case '+':printf("%.1lf",a+b);break;
        case '-':printf("%.1lf",a-b);break;
        case '*':printf("%.1lf",a*b);break;
        case '/':
            if(b==0)printf("Divided by zero!");
            else printf("%.1lf",a+b);break;
        default:printf("Invalid operator!");
    }
}