check if string is palindrome in c

1#include <stdio.h>
2#include <conio.h>
3
4void main()
5{
6
7    int n,i,r=0;
8    
9    printf("Enter a number: ");
10    scanf("%d",&n);
11    
12    for(i=n;i!=0;i)
13    {
14        r=r*10;
15        r=r+ i%10;
16        i=i/10;
17    }
18    
19    if(r==n)
20        printf("palindrome");
21    else
22        printf("Not palindrome");
23}

1// this is for string
2
3#include <stdio.h>
4#include <string.h>
5
6void main()
7{
8  char a[100], b[100];
9
10  printf("Enter a string to check if it's a palindrome: ");
11  gets(a);
12
13  strcpy(b, a);
14
15  if (strcmp(a, b) == 0)
16    printf("\nThe string is palindrome.\n");
17
18  else
19    printf("\nThe string is not palindrome.\n");
20
21  getch();
22}
23

1#include <stdio.h>
2#include <conio.h>
3
4int palindrome (int num);
5
6void main()
7{
8    int n, ret;
9    printf("Enter the number: ");
10    scanf("%d",&n);
11
12    ret = palindrome(n);
13
14    if (ret == n)
15        printf("\nPalindrome\n");
16    else
17        printf("\nNot Palindrome\n");
18}
19
20int palindrome(int num)
21{
22    int rem, rev=0;
23
24    while (num!=0)
25    {
26        rem = num % 10;
27        rev = rev * 10 + rem;
28        num /= 10;
29    }
30
31    return rev;
32}
33