42. Write a C program to display following output on the screen.

1
2 3
4 5 6
7 8 9 10

#include <stdio.h>
void main()
{
    int i, j, num = 1;

    for (i = 1; i <= 4; i++)
    {
        for (j = 1; j <= i; j++)
        {
            printf("%d ", num);
            num++;
        }
        printf("\n");
    }
}

Output

1
2 3
4 5 6
7 8 9 10