c program to find the length of a string without using the built-in function and check palindrome or not

 /*   Write a c program to find the length of a string without using the built-in function also check whether it is a palindrome or not */

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

 void main()
 {
char string[25], revString[25]={'\0'};
int  i,length = 0, flag = 0;

clrscr();
fflush(stdin);

printf("Enter a string\n");
gets(string);

for (i=0; string[i] != '\0'; i++) /*keep going through each */
{                                 /*character of the string */
   length++;                     /*till its end */
}
printf("The length of the string \'%s\' = %d\n", string, length);

for (i=length-1; i >= 0 ; i--)
{
  revString[length-i-1] = string[i];
}
/*Compare the input string and its reverse. If both are equal
 then the input string is palindrome. Otherwise it is
 not a palindrome */

for (i=0; i < length ; i++)
{
  if (revString[i] == string[i])
flag = 1;
  else
flag = 0;

}

if (flag == 1)
  printf ("%s is a palindrome\n", string);
else
  printf("%s is not a palindrome\n", string);
 }


/*----------------------------------------------------
Output
Enter a string
madam
The length of the string 'madam' = 5
madam is a palindrome

RUN2
Enter a string
good
The length of the string 'good' = 4
good is not a palindrome
----------------------------------------------------------*/