Recursive Function that adds two variables passed to it

Question

int mult2_recurse(int a, int b) {
}

Hello, I'm trying to fill in this function, which is passed 2 variables - called with different variables a couple times. I have to add the two variables without using any of *, /, +, =, *=, /=, +=, -= operators. I can only use ++ and/or -- operators. Can someone help me? I've tried numerous ways and can't seem to wrap the logic around my head.

Show one of the ways you've tried so we have a frame of reference. — kfsone, May 11 '16 at 21:48

score 5 · Answer 1 · answered May 11 '16 at 21:48

5

For unsigned solution is:

unsigned add2_recurse(unsigned a, unsigned b){
    return (0 == b) ? a : add2_recurse(++a, --b);
}

answered May 11 '16 at 21:48

Maxim Kholyavkin

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Hmmm, very nice. Very, very nice. – May 11 '16 at 21:51
Hmm, I tried this however it crashes after calling it twice with two different variables. – Chris22 May 11 '16 at 22:13
@Chris22 please use site like repl.it to show your code which crashed. – Maxim Kholyavkin May 11 '16 at 22:15
I gave the solution for `unsigned` case which you tried to use in signed case without changing. – Maxim Kholyavkin May 11 '16 at 23:14

Recursive Function that adds two variables passed to it

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