/*

 * 1-n整数中１出现的次数.cpp

 *

 *  Created on: 2018年5月1日

 *      Author: soyo

 */

#include<iostream>

using namespace std;

int NumberOf1( unsigned int n)

{

   int number=;

  while(n>=)

   {

       if(n%==)

           number++;

       n=n/;

   }

   return number;

}

int NumberOf1Between1AndN(unsigned int n)

{

    unsigned int i;

    int number=;

    for(i=;i<=n;i++)

    {

        //cout<<i<<" ";

       number+=NumberOf1(i);

    }

    return number;

}

int main()

{

    unsigned int n;

    cin>>n;

    int num;

    num=NumberOf1Between1AndN(n);

    cout<<endl;

    cout<<"Num中１的个数为:"<<num<<endl;

}

Num中１的个数为: