c++高精度浮点数加法

以下是C++实现高精度浮点数加法的示例代码：

#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;

const int N = 1e5 + 10;

struct Bignum
{
    int len, s[N];

    Bignum()
    {
        memset(s, 0, sizeof(s));
        len = 1;
    }

    Bignum(int num)
    {
        *this = num;
    }

    Bignum(const char* num)
    {
        *this = num;
    }

    Bignum operator = (int num)
    {
        char s[N];
        sprintf(s, "%d", num);
        *this = s;
        return *this;
    }

    Bignum operator = (const char* num)
    {
        memset(s, 0, sizeof(s));
        len = strlen(num);
        for (int i = 0; i < len; i++) s[i] = num[len - i - 1] - '0';
        return *this;
    }

    string str() const
    {
        string res = "";
        for (int i = 0; i < len; i++) res = (char)(s[i] + '0') + res;
        if (res == "") res = "0";
        return res;
    }

    Bignum operator + (const Bignum& b) const
    {
        Bignum c;
        c.len = 0;
        for (int i = 0, g = 0; g || i < max(len, b.len); i++)
        {
            int x = g;
            if (i < len) x += s[i];
            if (i < b.len) x += b.s[i];
            c.s[c.len++] = x % 10;
            g = x / 10;
        }
        return c;
    }
};

ostream& operator << (ostream& out, const Bignum& x)
{
    out << x.str();
    return out;
}

istream& operator >> (istream& in, Bignum& x)
{
    string s;
    in >> s;
    x = s.c_str();
    return in;
}

int main()
{
    Bignum a, b;
    cin >> a >> b;
    cout << a + b << endl;
    return 0;
}