C++实现round四舍五入四位小数，类似C#的round函数

参考链接： C++ round()

C++实现round四舍五入四位小数，类似C#的round函数  

C++实现round四舍五入N位小数  

#include <iostream> #include <sstream>

 #include <iomanip>

 using namespace std;

 double round(double number, unsigned int bits) {

     stringstream ss;

     ss << fixed << setprecision(bits) << number;

     ss >> number;

     return number;

 }

 int main() {

     double number = 3.1415926535897932;

     cout << fixed << showpoint << setprecision(15);

     cout << "一开始number = " << number << endl;

     for (int i = 0; i < 15; ++i) {

         cout << "number保留" << i << "位小数后为: " 

             << round(number, i) << endl;

     }

     return 0;

}