C语言实现整形数字转换成字符串

void reverse(char a[])
{
	int i, j;
	char c;

	for (i = 0, j = strlen(s) - 1; i < j; i++, j--)
	{
		c = s[i];
		s[i] = s[j];
		s[j] = c;
	}
}

/* itoa : convert n to char*/
void _itoa(int n, char s[])
{
	int i, sign;
	
	if ((sign = n) < 0)/* record sign */
	{
		n = -n;
	}
	i = 0;
	do//bring out each of the integer variables
	{
		s[i++] = n % 10 + '0';
	}while((n /= 10) > 0);
	if( sign < 0)//if the integer variables is negative 
	{
		s[i++] = '-';
	}
	s[i] = '\0';
	reverse(s);//we need reverse the integer variables
}