[Solved] Who is the winner? [closed]

It must be the bob == 0 and alice == 0 case. Put an print stamement in the else statement you will know why. Your execution is making that case somehow.

Also in issquare you should have the loop like this

for(i = 0; i <= num; i++) because for numbers like 1 it would fail.

Also there is a flaw in your logic. You should form the number

8 10 you should check 81 and 18. But in your case you don’t do this.(You check 90 and 108).

#include <stdio.h>
#include <stdlib.h>
int reverse(int num)
{
  int rev=0,inter = 0;
  while(num){ 
    inter = rev*10;
    if( inter/10 != rev){
        fprintf(stderr, "%s\n", "Overflow\n");
        exit(1);
    }
    rev=inter+num%10;
    num/=10;
  }
  return rev;
}

int issquare(int num)
{
  for(int i = 0; i <= num; i++){
    long long ii = i;
    long long mul  = ii*ii;
    if( ii!= 0 &&  mul/ii != ii){
        fprintf(stderr, "%s\n", "Overflow\n");
        exit(1);
    }
    if(mul == num)
      return 1;
    else if(mul > num){
        break;
    }
  }
  return 0;
}
int main()
{
  int num1, num2, normal, rev, alice, bob;
  if( scanf("%d%d", &num1, &num2)!= 2){
      fprintf(stderr,"Error in input\n");
      exit(1);
  }
  printf("%d %d", num1, num2);
  rev = reverse(num1+num2);
  normal = num1+ num2;
  bob = issquare(rev);
  alice = issquare(normal);
  if(bob==alice)
    printf("Tie"); 
  else if(bob > alice)
      printf("Bob wins.");
  else 
    printf("Alice wins.");
  return 0;
}