#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
double q =15.14259863;
cout << showpoint << q << endl; //默认输出六位有效数字
cout << setprecision(3) << q << endl; //定义输出有效位数字
cout << showpoint << q << endl;
cout << setprecision(7) << q << endl;
cout << showpoint << q << endl;
return 0;
}
#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
float i;
double j;
i = 10/3.0;
j = 10/3.0;
cout << fixed; //让浮点型固定以数字的方式显示
cout << setprecision(5); //控制显示的小数位数
cout << i << " " << endl;
cout << setprecision(8);
cout << j << " " << endl;
return 0;
}
