Question

以下函数声明在使用g ++编译时出错：

void lfsr::rsa (int x, int y, int z, boost::dynamic_bitset<> initSeq(5))

错误是：expected ‘,’ or ‘...’ before ‘(’ token

以下是整个代码：

#include <iostream>
#include <algorithm>
#include <vector>
#include <math.h>
#include <boost/dynamic_bitset.hpp> 

using namespace std;

class lfsr
{
    int y, xx, polyLoc, turnCount, n, end, p, q, d, f, e, m, c, l, g;
    boost::dynamic_bitset<> inpSeq;
    boost::dynamic_bitset<> operSeq;
    boost::dynamic_bitset<> bit;
    vector<int> xorArray;
    vector<int> keyReg;
public:
    void rsa(int, int, int, boost::dynamic_bitset<>);
    int key()
    {
        while (polyLoc > 0)
        {
            xorArray.push_back(polyLoc % 10);
            polyLoc /= 10;
        }
        sort(xorArray.rbegin(), xorArray.rend());
        operSeq = inpSeq;
        keyReg.push_back(inpSeq[0]);
        int x = xorArray[0];
        do {
            for (unsigned int r = 1; r < xorArray.size(); r++)
            {
                bit[4] = operSeq[x];
                y = xorArray[r];
                bit[4] = bit[4] ^ operSeq[y];
            }
            operSeq >>= 1;
            operSeq[4] = bit[4];
            keyReg.push_back(operSeq[0]);
            turnCount++;
        }
        while ((operSeq != inpSeq) && (turnCount < 1024));
        for (unsigned int i = 0; i < keyReg.size(); i++)
        {
            if (keyReg[i] == 1)
            {
                m = m + int(pow(2, i));
            }
            n = p * q;
            f = (p - 1) * (q - 1);
            for (int k = 0; end < 1; k++)
            {
                if ((1 + k * f) % d == 0)
                {
                    end = 2;
                    e = (1 + (k * f)) / d;
                }
            }
            g = int(pow(m, e));
            c = g % n;
            return (c);
        }
    };

    lfsr() // Constructor
    {
        y = 0;
        turnCount = 0;
        xx = 0;
        polyLoc = 320;
        n = 0;
        end = 0;
        p = 0;
        q = 0;
        d = 0;
        f = 0;
        e = 0;
        m = 0;
        c = 0;
        l = 0, g = 0;
        boost::dynamic_bitset<> inpSeq(5);
        boost::dynamic_bitset<> operSeq(5);
        boost::dynamic_bitset<> bit(5);

    }

    void lfsr::rsa(int x, int y, int z, boost::dynamic_bitset<> initSeq(5))
    {
        p = x;
        q = y;
        d = z;
        inpSeq = initSeq;
    }

    int main()
    {
        lfsr public_key, private_key;
        public_key.rsa(29, 41, 74, 00111);
        private_key.rsa(43, 89, 73, 01011);
        cout << "Public key is: " << public_key.key() << endl;
        cout << "Private key is: " << private_key.key() << endl;
        cin.get();
        return 0;
    }

Answer 1

更改此代码

lfsr() //Constructor

到

lfsr::lfsr() //Constructor

将构造函数的声明插入到类

中

class lfsr {
    ....
public:
    lfsr();
    ....

将定义中的initSeq1的默认参数移至声明。（必须在声明中。）

此外，您的默认参数是错误的。它应该是initSeq = boost::dynamic_bitset<>(5)

更改此代码

class lfsr {
    ....
public:
    void rsa (int, int, int, boost::dynamic_bitset <>);
    ....
};
void lfsr::rsa (int x, int y, int z, boost::dynamic_bitset <> initSeq(5))
{
    ...

到

class lfsr {
    ....
public:
    void rsa (int, int, int, boost::dynamic_bitset<> = boost::dynamic_bitset<>(5));
    ....
};
void lfsr::rsa (int x, int y, int z, boost::dynamic_bitset<> initSeq)
{
    ...

在C ++中声明成员函数

1 个答案: