#include <iostream>
#include<bits/stdc++.h>
using namespace std;
int main()
{
double z = 12.001;
// 方法1
cout<<setiosflags(ios::fixed)<<setprecision(2)<<z; //保留两位小数
printf("\n");
// 方法2
printf("%.2f",z); //保留两位小数
return 0;
}
C++ retains 2 decimal places
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Origin blog.csdn.net/u013288190/article/details/132152237
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