Need help with palindrome program

**bellagomes21** · 02-12-2016

Hi,
I'm not expecting anybody to do the work for me, I would really appreciate it if you guys could lead me in the right direction. I need to write a program in C using only #include <stdio.h> and #include <stdlib.h> to write a program that checks whether a string is a palindrome or not. The string has letters, punctation characters, and digits. Assume the string ends with a null terminator. Assume the string has no spaces and distinguish between lowercase and uppercase characters. So madam is a palindrome, but MaDam is not a palindrome.
So the string takes at most 30 characters. What I am really confused on is what library functions I would use to determine the length of the string? And how would I distinguish between lower and uppercase characters?

**Salem** · 02-13-2016

> I need to write a program in C using only #include <stdio.h> and #include <stdlib.h>
Mmmm-ok

> What I am really confused on is what library functions I would use to determine the length of the string? And how would I distinguish between lower and uppercase characters?
Well the obvious answer is strlen() in string.h, and isupper()/islower() in ctype.h

Are you allowed to use them, or do you have to write your own?

**naaissus** · 02-13-2016

With stdio only:

Code:

char string[] = "Does this works....";
    
int length = 0;
while (string[length] != '\0')
    length++;

printf("Length: %d\n", length);

char testChar = 's';
if (testChar >= 'A' && testChar <= 'Z')
    printf("UpperCase\n");
    
if (testChar >= 'a' && testChar <= 'z')
    printf("LowerCase\n");

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