#include <stdio.h>
#include <stdlib.h>
#include <time.h>

const int limit = 100;

int next(void)
{
    return rand() % limit;
}

int main(void)
{
    srand(time(0));

    unsigned columns = 12;
    unsigned line_width = 80;
    unsigned field_width = line_width / columns;

    for (unsigned i = 0; i < 156; ++i)
    {
        printf("%*i", field_width, next());

        if ((i + 1) % columns == 0)
            printf("\n");
    }
}