CareerCup

please explain a bit more, your question is not clear

What is expected as an answer, possible reasons for the crash?

you could write something like this:
Note: this version is platform dependent, diff. pltfrms implement stacks differently
int sum(int a,int b){
int c;
int *ptr = &a;
ptr--;ptr--;
*ptr = 0x034322; //Over write the return address
return c;
}

main(){
cout<<"sum = "<<sum(1,2)<<endl;
}

The ans is a fun. which doesn't do anything wrong but still crashes the program?

#!cpp
int func()
{
  int arr[1];
  arr[1] = 0; // marking the returnn addr as 0
  return 0;
}
int main()
{
   func();
   return 0;
}

I think what they are asking for, is what could be a possible bug.

The most common occurence of a bug such as this, is when one overflows a statically declared buffer, thereby corrupting the stack frame, possibly borking the return address.

May be the function is returning Illegal address.

@Anonymous & Murugan
Quite possible! might be what the interviewer was expecting? right@Sun
otherwise the question is incomplete/dumb..

I cannot understand either of the codes gives up (@Anon and @ashu). Either explain clearly or do not give a solution at all!

Keep return type as int& lol