C语言函数实现 | 02-整型数据转为字符串

Posted 2021-09-17 Neutionwei

const char *int2str(int val)
{
	static char str[12];
	int isNegative = 0;
	int i = 0, j = 0;

	if (val == 0) {
		str[0] = '0';	// ASCII: 48
		str[1] = '\\0';	// ASCII: 0
		return str;
	} else if (val == INT_MIN) {
		int2str(val + 1);
		char *tmp = str;
		while (*tmp != '\\0')
			tmp++;
		tmp--;
		*tmp += 1;
		return str;
	} else if (val < 0) {
		val *= -1;
		isNegative = 1;
		str[i++] = '-';
		j++;
	}
	while (val) {
		str[i++] = val % 10 + '0';
		val /= 10;
	}
	str[i--] = '\\0';
	while (j < i) {
		char ch = str[i];
		str[i--] = str[j];
		str[j++] = ch;
	}

	return str;
}