标签：mes pre std ios cin ble while str ace
#include <iostream>
#include<iomanip>
using namespace std;
int main(void)
{
double a;
while(cin>>a)
{
if(a<0)
a=-a;
cout<<fixed<<setprecision(2);
cout<<a<<endl;
}
}
标签：mes pre std ios cin ble while str ace
原文地址：https://www.cnblogs.com/heroin1/p/12316641.html
