Triangle of integers

// cpp program: triangle of integers
// created on April, 2016
// Author: fueanta

#include <iostream>
using namespace std;

int main(void) {
    int x;
    cout << "Give the number: ";
    cin >> x;
    int m=x,n=1;
    for (int i=0;i<x;i++) {
            m--;
        for (int j=0;j<m;j++) {
            cout << " ";
        }
        for (int k=0;k<x-m;k++) {
            cout << n;
            n++;
        }
        n-=2;
        for (int l=0;l<x-m;l++) {
            if (n>0) {
                cout << n;
                n--;
            }
        }
        n=1;
        cout << endl;
    }
    return 0;
}