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#include <iostream>
using namespace std;
#include <string.h>
bool nguyento(int a);
void main()
{
	hj:;
 
	int a;
 
	cout<<"Hay nhap so can kiem tra: "; cin>>a;system("cls");
	if (nguyento(a)==true)
		cout << " Day la so nguyen to" << endl;
	else cout <<"Day khong phai la so nguyen to" <<endl;
 
	system("pause"); system("cls"); cout<< "Ban co muon tiep tuc!!!!"<<endl;
	char *b, c[]="k", d[]="K";
	cin >>*b;
	cout <<*b<<endl;
	if(strcmp(b,c)!=0 ||strcmp(b,d)!=0)
		goto hj;
	system("pause");
}
 
 
bool nguyento(int a)
{
	if (a<2)
		return false;
	for (int i=2;i<=sqrt((float)a);i=i+1)
		if (a%i==0)
			{
				return false;
				break;
			}
	return true;
 
}

Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:1: error: class, interface, or enum expected
#include <iostream>
         ^
Main.java:3: error: illegal character: '#'
#include <string.h>
^
Main.java:3: error: class, interface, or enum expected
#include <string.h>
         ^
Main.java:5: error: class, interface, or enum expected
void main()
^
Main.java:9: error: class, interface, or enum expected
	int a;
	^
Main.java:11: error: class, interface, or enum expected
	cout<<"Hay nhap so can kiem tra: "; cin>>a;system("cls");
	^
Main.java:11: error: class, interface, or enum expected
	cout<<"Hay nhap so can kiem tra: "; cin>>a;system("cls");
	                                    ^
Main.java:11: error: class, interface, or enum expected
	cout<<"Hay nhap so can kiem tra: "; cin>>a;system("cls");
	                                           ^
Main.java:12: error: class, interface, or enum expected
	if (nguyento(a)==true)
	^
Main.java:14: error: class, interface, or enum expected
	else cout <<"Day khong phai la so nguyen to" <<endl;
	^
Main.java:16: error: class, interface, or enum expected
	system("pause"); system("cls"); cout<< "Ban co muon tiep tuc!!!!"<<endl;
	^
Main.java:16: error: class, interface, or enum expected
	system("pause"); system("cls"); cout<< "Ban co muon tiep tuc!!!!"<<endl;
	                 ^
Main.java:16: error: class, interface, or enum expected
	system("pause"); system("cls"); cout<< "Ban co muon tiep tuc!!!!"<<endl;
	                                ^
Main.java:17: error: class, interface, or enum expected
	char *b, c[]="k", d[]="K";
	^
Main.java:18: error: class, interface, or enum expected
	cin >>*b;
	^
Main.java:19: error: class, interface, or enum expected
	cout <<*b<<endl;
	^
Main.java:20: error: class, interface, or enum expected
	if(strcmp(b,c)!=0 ||strcmp(b,d)!=0)
	^
Main.java:22: error: class, interface, or enum expected
	system("pause");
	^
Main.java:23: error: class, interface, or enum expected
}
^
Main.java:30: error: class, interface, or enum expected
	for (int i=2;i<=sqrt((float)a);i=i+1)
	^
Main.java:30: error: class, interface, or enum expected
	for (int i=2;i<=sqrt((float)a);i=i+1)
	             ^
Main.java:30: error: class, interface, or enum expected
	for (int i=2;i<=sqrt((float)a);i=i+1)
	                               ^
Main.java:34: error: class, interface, or enum expected
				break;
				^
Main.java:35: error: class, interface, or enum expected
			}
			^
Main.java:38: error: class, interface, or enum expected
}
^
26 errors

Standard output is empty