hdu 2003 求绝对值

#include <algorithm>
#include <iostream>
#include <cstring>
#include <cstdio>
#include <vector>
#include <cmath>
#include <queue>
#include <deque>
#include <cmath>
#include <map>

using namespace std;
typedef long long ll;

const double inf=1e20;
const int maxn=2e5+10;
const int mod=1e9+7;

int main(){
    double n;
    while(scanf("%lf",&n)!=EOF){
        if(n<0)n=-n;
        printf("%.2lf\n",n);
    }
    return 0;
}