Program C++ Cek Hurup Inputan

#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
using namespace std;
int main()
{
char kata1[100],kata2[100],kata3[100];
int a,b,c;
loop1:
cout<<"*sub menu"<<endl;
cout<<"\t\t==>>>MENGECEK TIGA HURUF INPUTAN<<<=="<<endl;
cout<<"\t\t_____________________________________"<<endl<<endl;
cout<<"Input kata 1 : ";cin>>kata1;
cout<<"Input kata 2 : ";cin>>kata2;
cout<<"Input kata 3 : ";cin>>kata3;
a=strcmp(kata1,kata2);
b=strcmp(kata2,kata3);
c=strcmp(kata2,kata1);

if( a==b&&a==c&&b==c)
{
cout<<endl<<"Inputan sama silahkan input kembali"<<endl;
//system ("cls");
goto loop1;
}
else
{
strupr(kata1);
strupr(kata2);
strupr(kata3);
cout<<endl<<endl<<"==>>HASIL : ";
cout<<kata1<<"\t";
cout<<kata2<<"\t";
cout<<kata3;}
getch();
cout<<endl<<endl;
cout<<endl<<endl;
getch();
}