#include<stdio.h>
int main(){
    float n1=3,n2=5;
    char op='+';
    float result =0;
    switch(op){
        case '+':
        result=n1+n2;
        printf("%.2f",result);
        break;
        case '-':
        result=n1-n2;
        printf("%.2f",result);
        break;
        case '/':
        result=n1/n2;
        printf("%.2f",result);
        break;
        case '*':
        result=n1*n2;
        printf("%.2f",result);
        break;
    }
}