itoa() //将整形转换成字符串

#include <iostream>
#include<cstdlib>
#include<cstring>
using namespace std;
int main() 
{
int n;
cin>>n;
char a[100];
char b[100];
char c[100];
itoa(n,a,2);
cout<<strlen(a);
cin>>n;
itoa(n,b,16);
cout<<b;
cin>>n;
itoa(n,c,10);
cout<<c;
	return 0;
}