how to simulate loops for/while using a recursion

**~~transgalactic2~~** · 01-06-2009

how to build for and while loops using a recursion?

**cyberfish** · 01-06-2009

Code:

void countdown(int n) {
     if (n == 0) return;
     printf("%d\n", n);
     countdown(n - 1);
}

Why would you want to do this, though? It's much simpler with loops, and you won't need to worry about stack overflow.

**~~transgalactic2~~** · 01-06-2009

thanks

**sergioms** · 01-06-2009

Code:

void LoopFor ( int y, int n){
        int x;

        for (x=y; x<=n; x++)
           LoopFor (x, y, n);
}

void main (void)
{
    LoopFor (0, 100);

}

**matsp** · 01-06-2009

Originally Posted by sergioms

Code:

void LoopFor ( int y, int n){
        int x;

        for (x=y; x<=n; x++)
           LoopFor (x, y, n);
}

void main (void)
{
    LoopFor (0, 100);

}

That won't compile, and recurses 99! times, I should think [which will probably blow the stack to smithereens].

--
Mats

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