#include <stdio.h>
#include <limits.h>

void
reverse(char s[])
{
	int i = 0;
	while (s[i] != '\0') {
		++i;
	}
	--i;
	char c;
	for (int j = 0; j < i / 2; ++j) {
		c = s[i - j];
		s[i - j] = s[j];
		s[j] = c;
	}
}

void
itoa(int n, char s[])
{
	int i, sign;
	if ((sign = n) < 0) {
		n = -n - 1;
	}
	i = 0;
	do {
		s[i++] = n % 10 + '0';
	} while ((n /= 10) > 0);
	if (sign < 0) {
		s[i++] = '-';
	}
	s[i] = '\0';
	reverse(s);
}

void
itob(int n, char s[], int b)
{
	int i, sign;
	if ((sign = n) < 0) {
		n = -n;
	}
	i = 0;
	do {
		s[i++] = (n % b <= 9) ? n % b + '0' : n % b - 10 + 'a';
	} while ((n /= b) > 0);
	if (sign < 0) {
		s[i++] = '-';
	}
	s[i] = '\0';
	reverse(s);
}

int
main()
{
	char s[32];
	itoa(INT_MIN, s);
	printf("%s\n", s);
	itob(380, s, 16);
	printf("%s\n", s);
	return 0;
}