How write a recursive print program

Question

Gurus,

I want to know how to write a recursive function that prints

1
12
123
1234
...
......

For eg: display(4) should print

Answer 1

EDIT: OK, I improved my answer with the guidelines of @lc.

void print_recursive(unsigned int num) {
    if (num > 1) {
        print_recursive(num - 1);
    }
    for (unsigned int i = 0; i < num; i++) {
        printf("%d ", (i + 1));
    }
    printf("\n");
}