Possible Duplicate:

question about leading zeros

As in stackoverflow.com/questions/3232534/question-about-leading-zeros.

Number of trailing zeros, binary search from Hacker's Delight:

```
#include <iostream>
using namespace std;
int ntz(unsigned x){
int n;
if ( x==0) return 32;
n=1;
if ((x & 0x0000FFFF))==0) {n=n+16; x=x>>16;}
if ((x & 0x000000ff)==0) {n=n+8;x>>=8;}
if ( x &0x0000000F)==0) {n=n+4; x>>=4;}
if ((x & 0x00000003)==0) { n=n+2; x>>=2;}
return n-(x &1);
}
int main(){
unsigned x;
cin>>x;
cout<<ntz(x)<<endl;
return 0;
}
```

When i enter 8 it return 8 and when I enter 9 the same result why?

Firstly, your code doesn't compile. The parentheses in lines 9 and 11 are not balanced correctly.

That said, after fixing the errors and compiling, I get the following results:

```
$ ./a.out
8
3
$ ./a.out
9
0
```

answered on Stack Overflow Jul 12, 2010 by danben

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