算法題總結 II

一. integer 和 character 之間轉換

//one integer is 12321, pick up every digit one by one 
int x = 12321;
int n1 = x; //after remove digits from right side
int n2 = x; //after remove digits from left side
for(var i = 1;i <= l/2; i++)
{
	var p = Math.Pow(10, digits-i);
	int x1 = n1 % 10;  //the digit will be removed from right side
	int x2 = (int) (n2 / p);  //the digit will be removed from right side

	if(x1 != x2) return false;

	n1 /= 10;
	n2 -= (int)(x2 * p);
}
return true;