c++ code check this code 2011-12

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Code:
#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
class bingo
{
  public:int a[5][5];
	 void input();
	 void check();
	 void play();
	 void comp();
};
 
void bingo::input()//input a 5*5 matrix
{
   int i,j,num;
   cout<<"\n Enter numbers 1-25\n";
   for(i=0;i<5;i++)
   {
     for(j=0;j<5;j++)
     {
       cin>>a[i][j];
     }
     endl;
   }
}
 
void bingo::check()//no number 1-25 must be repeated
{       int error=0;
    for(int i=0;i<5;i++)
    {
     for(int j=0;j<5;j++)
     {
       int num=a[i][j];
       if(num==a[i][j+1])
       {
	 error=1;
       }
     }
    }
    if(error>0)
    {
      cout<<"\n Number repeated\n";
      cout<<"PLEASE START OVER\n";
      cout<<"\a";
      getch();
      exit(0);
    }
}
 
void bingo::play()
{
  cout<<"\n START GAME\n";
  for(int cal=1;cal<=25;cal++)//print input
  {
   for(int i=0;i<5;i++)
    {
     for(int j=0;j<5;j++)
     {
      cout<<a[i][j]<<" ";
     }
    cout<<"\n"<<"\n";
  }
    cout<<"\n Enter the number to be striked\n";
    int num,j,k=0,diag=0;
    cin>>num;
    for(i=0;i<5;i++)//place 0 in place of num
    {
      for(j=0;j<5;j++)
      {
	if(num==a[i][j])
	{
	  a[i][j]=0;
	  if((a[k][k]==0)&&(diag!=5))//check for diagnol elements
	  {
	     diag++;
	     k++;
	     if(diag==5)//if all the 5 elents are 0
	      cout<<"\n Row completed\n";
	  }
	}
      }
    }
  }
}
void main()
{
   clrscr();
   bingo b;
   b.input();
   b.check();
   b.play();
}