gistfile1.txt

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#include <stdio.h>

int main()
{
    while(1){
        char string[25], reverseString[25] = {'\0'};
    int  i, length = 0, flag = 0;
    
    fflush(stdin);
    printf("Enter a word \n");
    gets(string);

    for(int i = 0; string[i] != '\0'; i++){ 
        string[i] = tolower(string[i]); 
    }
    /*  keep going through each character of the string till its end */
    for (i = 0; string[i] != '\0'; i++)
    {
        length++;
    }
    if(length == 2 && string[0] == '-' && string[1] == '1'){
	    break;
    }
    for (i = length - 1; i >= 0; i--)
    {
       reverseString[length - i - 1] = string[i];
    }
    /*
     * Compare the input string and its reverse. If both are equal
     * then the input string is palindrome.
     */
    for (i = 0; i < length; i++)
    {
        if (reverseString[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);
    }
    return 0;
}