C program to print box number pattern with alternative 0 and 1

/**

 * C program to print box number pattern 

1 0 1 0 1

0 1 0 1 0

1 0 1 0 1

0 1 0 1 0

1 0 1 0 1

 */

#include <stdio.h>

#include<conio.h>

void main()

{

    int rows, cols, i, j, k;

    /* Input rows and columns from user */

    printf("Enter number of rows: ");

    scanf("%d", &rows);

    printf("Enter number of columns: ");

    scanf("%d", &cols);

    k = 1;

    for(i=1; i<=rows; i++)

    {

        for(j=1; j<=cols; j++)

        {

            if(k == 1)

            {

                printf("1");

            }

            else

            {

                printf("0");

            }

            // If k = 1  then k *= -1 => -1

            // If k = -1 then k *= -1 =>  1

            k *= -1;

        }

        if(cols % 2 == 0)

        {

            k *= -1;

        }

        printf("\n");

    }

    getch();

}

                                                           source :codeforwin.org