SHA256
76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
#ifndef BETTERSTL_BIG_INTEGER_HPP
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#define BETTERSTL_BIG_INTEGER_HPP
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#include <string>
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#include <iostream>
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namespace bstl {
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class BigInteger {
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public:
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BigInteger();
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BigInteger(int value);
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BigInteger(long long value);
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BigInteger(unsigned long long value);
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explicit BigInteger(const std::string& value);
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explicit BigInteger(const char* value);
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BigInteger(const BigInteger& other) = default;
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BigInteger& operator=(const BigInteger& other) = default;
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[[nodiscard]] bool isZero() const;
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[[nodiscard]] int sign() const;
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[[nodiscard]] std::string toString() const;
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bool operator==(const BigInteger& other) const;
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bool operator!=(const BigInteger& other) const;
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bool operator<(const BigInteger& other) const;
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bool operator>(const BigInteger& other) const;
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bool operator<=(const BigInteger& other) const;
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bool operator>=(const BigInteger& other) const;
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bool operator==(int value) const;
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bool operator!=(int value) const;
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bool operator<(int value) const;
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bool operator>(int value) const;
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bool operator<=(int value) const;
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bool operator>=(int value) const;
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bool operator==(long long value) const;
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bool operator!=(long long value) const;
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bool operator<(long long value) const;
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bool operator>(long long value) const;
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bool operator<=(long long value) const;
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bool operator>=(long long value) const;
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BigInteger operator+() const;
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BigInteger operator-() const;
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BigInteger& operator+=(const BigInteger& other);
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BigInteger& operator-=(const BigInteger& other);
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BigInteger& operator*=(const BigInteger& other);
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BigInteger& operator/=(const BigInteger& other);
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BigInteger operator+(const BigInteger& other) const;
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BigInteger operator-(const BigInteger& other) const;
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BigInteger operator*(const BigInteger& other) const;
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BigInteger operator/(const BigInteger& other) const;
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private:
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std::string m_digits; // 无符号数字，从高位到低位
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int m_sign; // -1, 0, 1
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static std::string m_trimLeadingZeros(const std::string& value);
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static int m_compareAbs(const std::string& a, const std::string& b);
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static std::string m_addAbs(const std::string& a, const std::string& b);
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static std::string m_subAbs(const std::string& a, const std::string& b);
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static std::string m_mulAbs(const std::string& a, const std::string& b);
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static std::string divAbs(const std::string& a, const std::string& b);
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};
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// 流运算符重载
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std::ostream& operator<<(std::ostream& os, const BigInteger& bi);
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std::istream& operator>>(std::istream& is, BigInteger& bi);
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} // namespace bstl
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#endif //BETTERSTL_BIG_INTEGER_HPP
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