C++ Truncation trunc(x, n)

Simple C++ program to calculate truncation – trunc(x, n) function.

#include <iostream>
#include <cmath>

using namespace std;


// 2018 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net
double trunc(double x, int n);

int main() {
  double x = 0;
  int n = 0;

  cout << "Enter x: ";
  cin >> x;


  cout << "Enter n: ";
  cin >> n;

  cout << "trunc(" << x << ", " << n << ") is equal to " << trunc(x, n);

  int a;
  cin >> a;

  return 0;
}

double trunc(double x, int n) {
  return x > 0 ? floor(pow(10, n) * x) / pow(10, n) : ceil(pow(10, n) * x) / pow(10, n);
}

IN
5.1423 2
-5.1423 2
OUT
5.14
-5.14