因此，当我尝试创建整数类数组时出现错误。整数 * arr = 新整数 [3]; 这不起作用，我不明白为什么。查看底部的 main() 函数，看看我在哪里有这行代码。
using namespace std;
class Integer
{
unsigned int * data;
bool positive;
int length;
static const long long BASE = (long long)UINT_MAX + 1;
void copy(const Integer & from)
{
int trim = 0;
for(int i = 0; i < from.length; i++)
{
if(from.data[i] == 0)
trim++;
else
break;
}
length = from.length - trim;
if(length == 0)
{
length = 1;
data = new unsigned int[length];
data[0] = 0;
}
else
{
data = new unsigned int[from.length];
positive = from.positive;
for(int i = 0, j = trim; i < length; i++, j++)
{
data[i] = from.data[j];
}
}
}
Integer(unsigned int * newData, int len, bool sign)
{
data = newData;
length = len;
positive = sign;
}
static void stripLeadingZeros(unsigned int *& data, int & length)
{
int i;
for(i = 0; i < length; i++)
{
if(data[i])
break;
}
if(i == 0)
return;
int newLen = length - i;
unsigned int * tmp = new unsigned int[newLen];
for(int ni = 0; i < length; i++, ni++)
{
tmp[ni] = data[i];
}
delete data;
data = tmp;
length = newLen;
}
public:
Integer(long long n)
{
positive = n >= 0;
if(!positive)
n *= -1;
unsigned int highVal = n >> 32;
if(highVal == 0)
{
length = 1;
data = new unsigned int[length];
data[0] = (unsigned int)n;
}
else
{
length = 2;
data = new unsigned int[length];
data[0] = highVal;
data[1] = (unsigned int)n;
}
}
/*Integer(int n)
{
if(n < 0)
{
positive = false;
n *= -1;
}
length = 1;
data = new int[length];
data[0] = n;
}*/
Integer(const Integer & from)
{
copy(from);
}
Integer & operator=(const Integer& from)
{
copy(from);
return *this;
}
~Integer()
{
if(data != NULL)
delete[] data;
}
void add(Integer & n)
{
int newLen = max(this->length, n.length) + 1;
unsigned int * newData = new unsigned int[newLen];
int carry = 0;
long long sum;
for(int i = newLen - 1, thisI = this->length - 1, nI = n.length - 1; i >= 0; i--, thisI--, nI--)
{
sum = (thisI >= 0 ? (long long)this->data[thisI] : 0) + (nI >= 0 ? (long long)n.data[nI] : 0) + carry;
newData[i] = sum % BASE;
carry = sum / BASE;
}
if(newData[0] == 0)
stripLeadingZeros(newData, newLen);
delete[] this->data;
this->length = newLen;
this->data = newData;
}
void add(Integer * numbers, int arrLen)
{
int maxLen = 0;
int * positions = new int[arrLen];
for(int i = 0; i < arrLen; i++)
{
positions[i] = numbers[i].length - 1;
maxLen = numbers[i].length > maxLen ? numbers[i].length : maxLen;
}
int newLen = maxLen + 1;
unsigned int * newData = new unsigned int[newLen];
int carry = 0;
long long sum;
int thisPos = this->length - 1;
for(int i = newLen - 1; i >= 0; i--, thisPos--)
{
sum = (thisPos >= 0 ? this->data[thisPos] : 0) + carry;
for(int j = 0; j < arrLen; j++)
{
sum += positions[j] >= 0 ? numbers[j].data[positions[j]--] : 0;
}
newData[i] = sum % BASE;
carry = sum / BASE;
}
delete[] positions;
if(newData[0] == 0)
stripLeadingZeros(newData, newLen);
delete[] this->data;
this->length = newLen;
this->data = newData;
}
string to_string()
{
stringstream ss;
for(int i = 0; i < length; i++)
{
ss << "(" <<data[i] << " x " << BASE << "^" << length - i - 1 << (i != length - 1 ? ") + " : ")");
}
return ss.str();
}
};
int main()
{
Integer w(234);
Integer x(243);
Integer y(234234);
Integer z(232);
Integer * a = new Integer[3]; // Error
a[0] = w;
a[1] = x;
a[2] = y;
z.add(a, 3);
cout << x.to_string() << endl;
delete[] a;
return 0;
}