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using namespace std;
#include<iostream>
#include<math.h>
#include<stdio.h>
#include<conio.h>
class hinhchunhat
{
	private:
		float cd,cr;
	public:
		void nhap()
		{
			cout<<"nhap chieu dai:";
			cin>>cd;
			cout<<"nhap chieu rong:";
			cin>>cr;
		}
		void xuat()
		{
		cout<<"chieu dai la:"<<cd<<endl;
		cout<<"chieu rong la:"<<cr<<endl;
	    }
	  int chuvi()
	    {
	    	float cv;
	    	cv=(cd+cr)*2;
	    	return cv;
	    }
	    int dientich()
	    {
	    	float dt;
	    	dt=cd*cr;
	    	return dt;
	    }
};
main()
{
	hinhchunhat hcn;
	hcn.nhap();
	hcn.xuat();
	cout<<"\ndien tich hcn la:"<<hcn.dientich();
	cout<<"\nchu vi hcn la:"<<hcn.chuvi();
	getch();
}

Main.java:1: error: class, interface, or enum expected
using namespace std;
^
Main.java:2: error: illegal character: '#'
#include<iostream>
^
Main.java:2: error: class, interface, or enum expected
#include<iostream>
        ^
Main.java:3: error: illegal character: '#'
#include<math.h>
^
Main.java:4: error: illegal character: '#'
#include<stdio.h>
^
Main.java:5: error: illegal character: '#'
#include<conio.h>
^
Main.java:8: error: illegal start of type
	private:
	       ^
Main.java:8: error: ';' expected
	private:
	        ^
Main.java:9: error: <identifier> expected
		float cd,cr;
		        ^
Main.java:10: error: illegal start of type
	public:
	      ^
Main.java:10: error: ';' expected
	public:
	       ^
Main.java:11: error: invalid method declaration; return type required
		void nhap()
		     ^
Main.java:13: error: not a statement
			cout<<"nhap chieu dai:";
			    ^
Main.java:14: error: not a statement
			cin>>cd;
			   ^
Main.java:15: error: not a statement
			cout<<"nhap chieu rong:";
			    ^
Main.java:16: error: not a statement
			cin>>cr;
			   ^
Main.java:20: error: not a statement
		cout<<"chieu dai la:"<<cd<<endl;
		                         ^
Main.java:21: error: not a statement
		cout<<"chieu rong la:"<<cr<<endl;
		                          ^
Main.java:36: error: class, interface, or enum expected
main()
^
Main.java:39: error: class, interface, or enum expected
	hcn.nhap();
	^
Main.java:40: error: class, interface, or enum expected
	hcn.xuat();
	^
Main.java:41: error: class, interface, or enum expected
	cout<<"\ndien tich hcn la:"<<hcn.dientich();
	^
Main.java:42: error: class, interface, or enum expected
	cout<<"\nchu vi hcn la:"<<hcn.chuvi();
	^
Main.java:43: error: class, interface, or enum expected
	getch();
	^
Main.java:44: error: class, interface, or enum expected
}
^
25 errors

Standard output is empty