Write a program to check given string is palindrome number or not using c language.

   Write a  program to check given string is palindrome number or        not using c language.
    
   #include<string.h>
 #include<conio.h>
   #include<stdio.h>
    int main()
{
   char *str1,*rev;
     int i,j;
    printf("\nEnter a string:");
      scanf("%s",str1);
      for(i=strlen(str1)-1,j=0;i>=0;i--,j++)
      rev[j]=str[i1];
      rev[j]='\0';
  if(strcmp(rev,str1))
      printf("\nThe string is not a palindrome");
  else
      printf("\nThe string is a palindrome");
  return 0;
}