Code:
#include <stdio.h>

int main(void)
{

    int i,
        sum = 0;

    for(i = 10; i <= 33; i++)
    {
        sum += i;
            printf("%3d", i);
    }

}
trying to get:
10 11 12 13 14 15
16 17 18 19 20 21
......
....................... 33

I dont know how to make new line when it reaches 15.