C++ / 数値を丸める / <iomanip>、fixed、setprecision()

#include <iostream>
#include <iomanip>
using namespace std;

int main(){
    double dbl;
    int n;

    cout << "Enter any real number: ";
    cin >> dbl;
    cout << "Specify the number of digits after the decimal: ";
    cin >> n;
    cout << fixed << setprecision(n) << dbl << endl;

    system("pause");
    return 0;
}