#include <stdbool.h>
#include "include/stdlib.h"

int atoi(const char* s) {
	bool neg = false;
	if(*s == '+') {
		s++;
	} else if(*s == '-') {
		neg = true;
		s++;
	}
	int n = 0;
	while(*s >= '0' && *s <= '9') {
		n *= 10;
		n += (*s - '0');
		s++;
	}
	return neg ? -n : n;
}