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Update BigInteger.cpp By Adding More Operators #54

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Update BigInteger.cpp By Adding More Operators #54

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37 changes: 30 additions & 7 deletions ch5/BigInteger.cpp
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Original file line number Diff line number Diff line change
@@ -1,14 +1,12 @@
#include<cstdio>
#include<cstdio>
#include<cstring>
#include<vector>
#include<iostream>
using namespace std;

struct BigInteger {
static const int BASE = 100000000;
static const int WIDTH = 8;
vector<int> s;

BigInteger(long long num = 0) { *this = num; } // 构造函数
BigInteger operator = (long long num) { // 赋值运算符
s.clear();
Expand Down Expand Up @@ -42,6 +40,35 @@ struct BigInteger {
}
return c;
}
BigInteger operator - () const {
s.back()=-s.back();
}
BigInteger operator - (const BigInteger& b) const {
return (*this)+(-b);
}
BigInteger operator * (const BigInteger& b) const {
BigInteger c;
for(BigInteger i=1;i<=b;i=i+1)c=c+*this;
return c;
}
BigInteger operator / (const BigInteger& b) const {
BigInteger c=*this,i;
for(i=0;c>0;i++)c-=b;
return i-1;
}
BigInteger operator % (const BigInteger& b) const {
return *this-(*this/b*b);
}
bool operator < (const BigInteger& b) const {
if(s.size() != b.s.size())return s.size() < b.s.size();
for(int i = s.size()-1;i>=0;i--)
if(s[i] != b.s[i])return s[i] < b.s[i];
return false;
}
bool operator >(const BigInteger& b) const {return b < *this;}
bool operator >=(const BigInteger& b) const {return !(*this < b);}
bool operator <=(const BigInteger& b) const {return !(b < *this);}
bool operator ==(const BigInteger& b) const (return (b <= *this)&&(*this <= b);}
};

ostream& operator << (ostream &out, const BigInteger& x) {
Expand All @@ -53,24 +80,20 @@ ostream& operator << (ostream &out, const BigInteger& x) {
}
return out;
}

istream& operator >> (istream &in, BigInteger& x) {
string s;
if(!(in >> s)) return in;
x = s;
return in;
}

#include<set>
#include<map>
set<BigInteger> s;
map<BigInteger, int> m;

int main() {
BigInteger y;
BigInteger x = y;
BigInteger z = 123;

BigInteger a, b;
cin >> a >> b;
cout << a + b << "\n";
Expand Down