求计算数中第一个1之后0 的个数

#include<iostream>
#include<string.h>
#include<cstdlib>
using namespace std;
char a[33];
int countOfZeros(int n)
{
    int count=0;
    itoa(n,a,2);
    int len=strlen(a);
    //cout<<a<<" "<<len<<endl;
    for(int i=0;i<len;i++)
        if(a[i]=='0')
            count++;
    return count;
}
int main()
{
    int num;
    cin>>num;
    cout<<countOfZeros(num)<<endl;
}