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#include<iostream>
using namespace std;
//功能：将一个十进制数转化为二进制数
void bin2(int n) {
int i,j=0;
int a[1000];
i=n;
if(i==0) {
cout<<"0"<<endl;
}
while(i) {
a[j]=i%2;
i/=2;
j++;
for(i=j-1; i>=0; i--)
cout<<a[i];
cout<<endl;
//计算二进制中1的个数
int CountBit(int x) {
int ret=0;
while(x) {
//计算十进制数为二进制数
cout<<"x= ";
bin2(x);
cout<<"x-1= ";
bin2(x-1);
cout<<"x&(x-1)= ";
bin2(x&(x-1));
ret++;
x=x&(x-1);
return ret;
int main() {
//有多少个1？
cout<<CountBit(63)<<endl;
return 0;
