题解——双分支

这题可用双分支

---

# include <iostream>
# include <cstdio>
using namespace std;
int main(){
    double x;
    cin>>x;
    if(x>0){
        printf("%.2f",x);
    }
    else{
        double xyz = 0-x;
        printf("%.2f",xyz);
    }

return 0;    
}