Chessboard by symbols '+' and '-'

#include <iostream>

using std::cout;
using std::cin;
using std::endl;

void main()
{
    setlocale(LC_ALL, "Russian");

    int a, temp;

    cout << "Введите размер шахматной доски: "; cin >> a;

    for (int i = 0; i < a; i++)
    {
            for (int j = 1; j < a + 1; j++)
            {

                temp = (i + j) % 2;

                if (temp == 1)  cout << '+' << " ";
                else            cout << '-' << " ";
            }

        cout << endl;

    }

    cout << endl;

}