String Palindrome without Library function

Write a function that accepts a string and returns 1 if the string is palindrome else 0 if string is not a palindrome without using any built in functions.

#include<stdio.h>

int palindrome(char str[10])

{

                int i, j;

                i=0;

                while(str[i]!='\0')

                {

                                i++;

                 }

                for(j=i-1, i=0;   j>=0;    j--,i++)

                {

                                if(str[i] != str[j])

                                return 0;

                }

                return 1;

}

void main()

{

                char str[10];

                int p;

                printf("\nEnter a string:   ");

                gets(str);

                p=palindrome(str);

                if(p)

                                printf("\nString is palindrome");

                else

                                printf("\nString is not palindrome");

}

Output:

Enter a string:   abcde

String is not palindrome

Enter a string:   abcba

String is palindrome


Method 2:

#include <stdio.h>

int main()

{

                char string[20];

                int i, length;

                int flag = 0;

                printf("Enter a string:");

                scanf("%s", string);

                length=0;

                while(string[length]!='\0')

                                length++;

                for(i=0;i < length ;i++)

                {

                                if(string[i] != string[length - i - 1])

                                {

                                                flag = 1;

                                                break;

                                }

                }

                if (flag)

                                  printf("\nstring is not a palindrome");

                else

                                  printf("\nstring is a palindrome");

  

}