Palindrome in C Using Pointers

A very simple program that will ask the user to give a string and then the program will check and determine if the given string is a palindrome or not using pointers in C.

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Sample Program Output

Program Listing

#include <stdio.h>

 

void stringUpr(char *s);

void stringLwr(char *s);

 

int main()

{

char string[100];

char *ptr,*rev;

printf("\n\n");

printf("\tPalindrome Program ");

printf("\n\n");

printf("\tGive a String : ");

gets(string);

ptr=string;

stringUpr(ptr);

   while(*ptr!=NULL){

      ++ptr;

       }

      --ptr;

for(rev=string; ptr>=rev;){

   if(*ptr == *rev)

       {

        --ptr;

        rev++;

      }

    else

break;

    }

if(rev>ptr) {

   printf("\n\n");

   stringUpr(string);

   printf("\tThe given string %s is Palindrome.",string);

     }

 else {

   printf("\n\n");

   stringUpr(string);

   printf("\tThe given string %s is Not a Palindrome.",string);

}

  printf("\n\n");

  printf("\tEND OF PROGRAM");

  printf("\n\n");

}

void stringLwr(char *s)

{

    int i=0;

    while(s[i]!='\0')

    {

        if(s[i]>='A' && s[i]<='Z'){

            s[i]=s[i]+32;

        }

        ++i;

    }

}

 

void stringUpr(char *s)

{

    int i=0;

    while(s[i]!='\0')

    {

        if(s[i]>='a' && s[i]<='z'){

            s[i]=s[i]-32;

        }

        ++i;

    }

    

}