#include <stdio.h>

char *reverse(char *a);
char *stripCR(char *s);

int main(void)
{
	char string[81];

	printf("Enter a string: \n");
	fgets(string, 81, stdin);

	printf("original: %s\n", string);

	printf("reversed: %s\n", reverse(stripCR(string)) );

	return(0);
}

char *stripCR(char *s)
{
	char *a;

	a = s;

	do
	{
		switch(*a)
		{
			case '\n':
			case '\f':
				*a = '\0';
		}
	} while('\0' != *(a++));

	return(s);
}

char *reverse(char *s)
{
	char *a, *b;

	a = b = s;

	while('\0' != *b)
		b++;

	b--;

	while(a < b)
	{
		*a = (*a) ^ (*b);
		*b = (*a) ^ (*b);
		*a = (*a) ^ (*b);
		a++;
		b--;
	}

	return(s);
}