C++大整数类bigInteger及几个重载运算符

设计大整数类以及几个运算符重载

#include
#include
#include
#include
#include
#include<memory.h>
using namespace std;
class bigInteger
{
private:
string number; //用string类来存放大整数
public:
bigInteger(string s=“0”){ number = s; } //带默认值的构造函数
void setNumber(string s){ number = s; }
string getNumber(){return number;}
friend istream& operator>>(istream& input, bigInteger& bigInt); //输入运算符重载，友元函数
friend ostream& operator<<(ostream& output, bigInteger& bigInt); //输出运算符重载，友元函数
bool operator!=(bigInteger bigInt); // "!=“运算符的重载
void operator+=(bigInteger bigInt); //”+=“运算符的重载
bigInteger operator+(bigInteger bigInt); //”+“运算符的重载
bigInteger operator*(int n); //”*"运算符的重载
};

//">>"重载

istream& operator>>(istream&input, bigInteger& bigInt) //输入运算符重载，友元函数
{
input >> bigInt.number;
return input;
}

//"<<"重载

ostream& operator<<(ostream& output, bigInteger& bigInt) //输出运算符重载，友元函数
{
output << bigInt.number;
return output;
}

//"!="重载

bool bigInteger::operator!=(bigInteger bigInt) //"!="运算符的重载
{
if (number != bigInt.number)
return true;
return false;
}

//"+="重载

void bigInteger::operator+=(bigInteger bigInt) //"+="运算符的重载
{
reverse(number.begin(), number.e