Problem with bool function

[agajantorayev]

HI, EVERYBODY! I have problem with bool function. The full source code is:

input file contains:
5
2 3 4 5 6

#include <iostream>
#include <fstream>
using namespace std;

int subset[10];

// function checks whether the given integer is from subset or not
bool is_from_subset(int x)
{
     //x is maximum 4 digit long
     for(int j=1000; j>0; j/=10){
             if(x>j){ 
                    if( x/j%10 == 0) return 0; //removing zeros
                    if( ((x/j)%10)!=subset[((x/j)%10)]) return 0;
                    }
             }
     return true;
}

main()
{
      ifstream fin("crypt1.in");
      ofstream fout("crypt1.out");
      int N, d, i=0;
      fin>>N;
      for(i=0; i<10; i++) subset[i]=0;
      i=0;
      while(i<N){fin>>d; subset[d]=d; i++;}
      if(is_from_subset(22*222)) cout<<"22*222";
      getchar();
}

the problem is here:

if(is_from_subset(22*222)) cout<<"22*222";

it does not produce an output but when I do the following:

int num=22*222;
if(is_from_subset(num)) cout<<"22*222";

Output:

4884

which is correct output.
I do not understand why when the argument of the function
is_from_subset() is integer the output is correct, but when the argument of the function is any expression there is no output???
Please, can anyone explain me my mistake???

[Duthomhas]

The problem is not in the argument.

What exactly do you mean by "subset"? Because I have no idea what you are trying to do...

[S6k9GNh0]

I seem some strange behavior here.

int num=22*222;
if(is_from_subset(num)) cout<<"22*222";

Erm, this won't output 4884, it will output 22*222 which signals you aren't showing us something.

In your main function, you assign integer i to 0 twice which is pointless. You also use a while statement where a for statement would be much more appropriate. The integer N is also input into a file with junk. Your subset function also uses return statements of 0 which is the same as returning true in this case. I don't think this is the functionality you wanted.