error C2065: 'setbase' : undeclared identifier？啥情况

Question

#include <iostream.h>#include <iomanip.h>int main(){int n;cin>>setbase(n);cout<<hex<<n<<endl<<dec<<n<<endl<<oct<<n<<endl;return 0;}error C2871: 'std' : does not exist or is not a namespaceerror C2065: 'setbase' : undeclared identifier怎么回事呢？大神不要打我。题目错了。没有那个，只是error C2065: 'setbase' : undeclared identifier

Answer 1

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
int n;
cin>>setbase(n);
cout<<hex<<n<<endl
<<dec<<n<<endl
<<oct<<n<<endl;
return 0;
}