how to round a decimal number in c++ code example

Example 1: c++ round to int

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    int x = 15;
    double result;
    result = round(x);
    cout << "round(" << x << ") = " << result << endl;

    return 0;
}

Example 2: round double to n decimal places c++

value = round( value * 100.0 ) / 100.0; // 2 decimal places
value = round( value * 1000.0 ) / 1000.0; // 3 decimal places