不使用库函数将整数转化为字符串

void int2str(int n,char *str)
{
	char buf[10] = "";
	int i = 0;
	int len = 0;
	int temp = n < 0?-n:n;
	if (str==NULL)
	{
		return;
	}
	while (temp)
	{
		buf[i++] = (temp%10) + '0';//+'0'目的将整数转化为字符
		temp = temp / 10;
	}
	len = n < 0 ? ++i:i;//n是负数,则多需一位来存储负号
	str[i] = 0;//末尾是结束符0
	while (1)
	{
		i--;
		if (buf[len-i-1]==0)
		{
			break;
		}
		str[i] = buf[len-i-1];//把buf数组里的字符拷到字符串
	}
	if (i==0)
	{
		str[i] = '-';
	}
}