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05:輸出保留12位小數的浮點數

urn using include mat std algorithm mes iostream printf

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<algorithm>
#include<cstring>
using namespace std;

int main()
{double a;
 cin>>a;
printf("%0.12lf",a);
return 0;
}

05:輸出保留12位小數的浮點數