Adding two nos. without any operator

Question

Is it possible to add two numbers without using any arithmetic or logical operators?

If so, how do I do it?

Solution:

main(){ 
  int x=10,y=21; 
  char *p=x; 
  printf("%d" , &p[y]); 
}

Atleast do not downvote this question as u didnt get the answer.

Is this out of personal interest, or something like an interview question? Anyways, I'm tired at the moment, and all I can think of is inline assembly. — chris, May 02 '12 at 06:18
i dont know...some1 asked me ..& i think its solution exists...but i dont know...wat it is — behinddwalls, May 02 '12 at 06:19
Sounds like homework or interview question ... if so, please tag it that way. — vdbuilder, May 02 '12 at 06:21
This type of questions has been posed many times. Please use the search tool before posting. Possible duplicate of [How to add two numbers without using ++ or + or another arithmetic operator](http://stackoverflow.com/questions/1149929/how-to-add-two-numbers-without-using-or-or-another-arithmetic-operator) — Jens Gustedt, May 02 '12 at 06:22
@JensGustedt Not a dupe. This one also forbids logical operators. — Mysticial, May 02 '12 at 06:23
@Mysticial, I don't have the impression that the question is as precisely posed as you suggest. In the contrary, I don't think that he has looked much around before posing it. — Jens Gustedt, May 02 '12 at 06:25
guys .. wait.. this is valid question & for better answer dis1 ... i think i have searched everywhere but didn't got the answer for this one.. and it doesn't allow u to use logical operator as well — behinddwalls, May 02 '12 at 06:29
i got 1 more answer for this.. `main(){ int x=10,y=21; char *p=x; printf("%d" , &p[y]); }` — behinddwalls, May 02 '12 at 06:39

R. Martinho Fernandes · Accepted Answer · 2012-05-02T06:27:36.910

5

int add(int x, int y) {
    std::vector<int> v(x);
    std::vector<int> u(y);
    for(auto& n : u) {
        v.push_back(n);
    }
    return v.size();
}

edited May 02 '12 at 06:27

answered May 02 '12 at 06:21

R. Martinho Fernandes

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I like it. Not very in-the-box. – chris May 02 '12 at 06:21
Nice... never would've thought of this. – Mysticial May 02 '12 at 06:22
very unique ... can you please explain this !! i have no idea what is this :) – satin May 02 '12 at 06:25
I preferred the version with the loop. Good enough to go on a t-shirt. – juanchopanza May 02 '12 at 06:27
1

@wannabeApro It creates two vectors with sizes x and y respectively, and then inserts all elements from the second vector into the first. Returns the size of the first vector which has now exactly x+y elements. – R. Martinho Fernandes May 02 '12 at 06:30
i got 1 more answer for this.. `main(){ int x=10,y=21; char *p=x; printf("%d" , &p[y]); }` – behinddwalls May 02 '12 at 06:35
@mSickCodes: That's not even well-formed. – GManNickG May 02 '12 at 06:49

Adding two nos. without any operator

1 Answers1