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Why does the for loop repeat in this recursion? (lemm.ee)

submitted 11 months ago by [email protected] to c/[email protected]

30 comments fedilink hide all child comments

I used the debugger to examine this code but not understanding a couple areas.

Why does the for loop repeat after it exits to print a new line? If it exits the loop, shouldn't it be done with it?
Why is n incremented and not i as stated with i++?


int main(void)
{
    int height = get_int("Height: ");

    draw(height);
}

void draw(int n)
{
    if (n &lt;= 0)
    {
        return;
    }

    draw(n - 1);

    for (int i = 0; i &lt; n; i++)
    {
        printf("#");
    }
    printf("\n");
}

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[–] [email protected] 5 points 11 months ago

The code below the draw(n - 1) isn't recursive... the call to draw(n - 1) is the recursion.

Sometimes, it can be helpful to invert recursion. Think about what draw(0) would be and write it down... then compute draw(1) using the value you previously computed for draw(0).