PALINDROME OR NOT (String)

This is a simple program to find out whether the entered string is a palindrome or not.

#include<iostream.h>
#include<conio.h>
#include<ctype.h>

int main()
{
    int a,b=0,c,d,e,f;
    char str1[100],str2[100];
    cout<<"Enter the string \n";
    gets(str1);
    for(a=0;str1[a]!='\0';a++)
    b++;
   
    b=b-1;
   
   
    for(c=0;str1[c]!='\0';c++)
    {
        str2[b]=str1[c];
        b--;
    }
    cout<<"The reverse of the String is :\n";
    for(a=0;str1[a]!='\0';a++)
    cout<<str2[a];
   
    cout<<"\n\n";
   
    for(c=0;str1[c]!='\0';c++)
    {
      if(str1[c]==str2[c])
      cout<<"";
      else
      {
           cout<<"The string is not a palindrome \n";
         getch();
         exit(0);   
      }
    }
    cout<<"IT is a palindrome\n";
    getch();
}

                                                    OUTPUT