CareerCup 1.2

2.c

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

void exchange(char str[])
{
	int len = strlen(str);
	char *beg, *end;
	char temp;
	beg = str;
	end = str + len - 1;
	while(beg < end)
	{
		temp = *beg;
		*beg = *end;
		*end = temp;
		beg++;
		end--;
	}
}

int main()
{
	char str[100];
	scanf("%s", str);
	exchange(str);
	printf("%s\n", str);
	return 0;
}