[RESOLVED] Question about unions,bitfields

[AwArEnEsS]

 #include <iostream>

using namespace std;

struct dore
{


   unsigned b1:1;
   unsigned b2:1;
   unsigned b3:1;
   unsigned b4:1;
   unsigned b5:1;
   unsigned b6:1;
   unsigned b7:1;
   unsigned b8:1;
   unsigned b9:1;
   unsigned b10:1;
   unsigned b11:1;
   unsigned b12:1;
   unsigned b13:1;
   unsigned b14:1;
   unsigned b15:1;
   unsigned b16:1;
   unsigned b17:1;
   unsigned b18:1;
   unsigned b19:1;
   unsigned b20:1;
   unsigned b21:1;
   unsigned b22:1;
   unsigned b23:1;
   unsigned b24:1;
   unsigned b24:1;
   unsigned b25:1;
   unsigned:b26:1;
   unsigned b27:1;
   unsigned b28:1;
   unsigned b29:1;
   unsigned b30:1;
   unsigned b31:1;
   unsigned b32:1;
};


union s
{
   int num;
   struct dore ya2;
  
};


int main()
{
    int sayi;
    s yapi1;
   
    cout << "Enter a number";
    cin >> sayi;
    yapi1.num=sayi;
    
    cout << yapi1.num << endl;
    cout << sizeof(yapi1.num);

     if (yapi1.ya2.b1==1) cout << "1";
     else cout << "0";
     if (yapi1.ya2.b2==1) cout << "1";
     else cout << "0";
   

      if (yapi1.ya2.b3==1) cout << "1";
     else cout << "0";
     if (yapi1.ya2.b4==1) cout << "1";
     else cout << "0";

     if (yapi1.ya2.b5==1) cout << "1";
     else cout <<"0";
     if (yapi1.ya2.b6==1) cout << "1";
     else cout <<"0";

     if (yapi1.ya2.b7==1) cout << "1";
     else cout <<"0";
     if (yapi1.ya2.b8==1) cout << "1";
     else cout <<"0";


}

This code works,it prints the first 8 bits of the given number.

But if I change this code:

 unsigned b1:1;
unsigned b2:1;
unsigned b3:1;
unsigned b4:1;
unsigned b5:1;
unsigned b6:1;
unsigned b7:1;
unsigned b8:1;
unsigned b9:1;
unsigned b10:1;
...
};

to :

int b1:1;
int b2:1;
int b3:1; 
...

then it doesn't work right.Why does using unsigned work although using int doesn't work as I expected?