C++把int型变量，二进制输出

#include<iostream.h>
#include <stdlib.h>
int main()
{
int  decimal=170;
char binary[255];
itoa(decimal,binary,2); //2代表进制，可以改8,16等
cout<<binary<<endl;
return 0;
}

#include<bitset>
#include<iostream>
using namespace std;
int main ()
{
int c=170;
bitset<sizeof(int)*8>a(c);
cout<<a<<endl;
return 0;
}