Problem Given by Jakir_1.3

#include <stdio.h>
int main (void)
{
    int i,j,k;
    for(i=1;i<=8;i++)
    {
       for(j=1,k=1;k<=(i+1)/2;k++,j++)
       printf("%d",j%10);
       printf("\n");
    }
    system("pause");
    return 0;
}

The output is given below:

1
1
12
12
123
123
1234
1234