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Simple Programming Tutorials For Beginners

Sunday, December 11, 2016

Palindrome String

/*
Summary: Palindromes are words or phrases that read the same in both directions.
*/

#include<stdio.h>
#include<string.h>
#include<conio.h>

char *strrev(char *str)
{
      char *p1, *p2;

      if (! str || ! *str)
            return str;
      for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
      {
            *p1 ^= *p2;
            *p2 ^= *p1;
            *p1 ^= *p2;
      }
      return str;
}

int main()
{
 char a[100], b[100];
 
 //Get the number from user.
 printf("Enter the string to check if it is a palindrome\n");
 gets(a);

 //copy input to another array b
 strcpy(b,a);

 //Reverse it.
 strrev(b);

 /*Compare it with the number entered by the user.If both are same then print palindrome number*/
 if( strcmp(a,b) == 0 )
  printf("\nEntered string is a palindrome.\n");
 else
  printf("\nEntered string is not a palindrome.\n");
 getch();
 return 0;
}

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