C++ 中的可变长度位集
A variable length bitset in C++
本文关键字:C++ 更新时间:2023-10-16
我有一个有效的 4 位线性反馈移位寄存器,使用 3 个长度为 4 的位集:inpSeq、operSeq 和 bit。我想让程序接受可变长度的位序列,所以那些以前的位集应该以某种方式具有可变长度。用户可以输入一个序列 inpSeq,程序将三个位集设置为与用户提供的序列长度相同。关于如何实现这一目标的任何想法?示例代码,如果我可以问的话!
这是代码:
#include <iostream> //Standard library.
#include <bitset> //Library for 10 handling.
#include <vector> //Variable size array.
#include <algorithm> //We use sorting from it.
using namespace std;
int main()
{
int y = 0;
int turnCount = 0;
int count1 = 0, count0 = 0;
bitset <4> inpSeq;
int polyLoc;
bitset <4> operSeq;
bitset <4> bit;
vector <int> xorArray;
vector <int> keyReg;
cout << "Enter a 4-bit sequence: n";
cin >> inpSeq;
cout << "Enter polynomial:";
cin >> polyLoc;
while(polyLoc>0)
{
xorArray.push_back(polyLoc%10);
polyLoc/=10;
}
cout << "xorArray is: ";
for ( unsigned int i = 0; i < xorArray.size(); i++)
{
cout << xorArray[i] << " ";
}
sort(xorArray.rbegin(), xorArray.rend());
cout << "n";
operSeq = inpSeq;
keyReg.push_back(inpSeq[0]);
int x = xorArray[0];
cout << "x is: " << x << "n";
for ( unsigned int i = 0; i < xorArray.size(); i++)
{
cout << xorArray[i] << "n";
}
cout << "bit 3 of initial " << bit[3] << "n";
do {
for (unsigned int r = 1; r < xorArray.size(); r++)
{
bit[3] = operSeq[x];
cout << "bit 3 from prev: " << bit[3] << "n";
y = xorArray[r];
cout << "opseq[y] is: " << operSeq[y] << "n";
bit[3] = bit[3] ^ operSeq[y];
cout << "bit[3] after xor: " << bit[3] << "n";
}
operSeq >>= 1;
cout <<"operSeq after shift: " << operSeq << "n";
operSeq[3] = bit[3];
cout <<"opserSeq bit 4 after = bit[3]: " << operSeq[3] << "n";
cout <<"new operSeq: " << operSeq << "n";
keyReg.push_back(operSeq[0]);
turnCount ++;
cout << "--n";
}
while ((operSeq != inpSeq) && (turnCount < 20));
cout << "Generated key is: ";
for (unsigned int k = 0; k < keyReg.size(); k++)
{
cout << keyReg[k];
}
cout << "n";
cout << "Bit 1 positions: ";
for ( unsigned int g = 0; g < xorArray.size(); g++)
{
cout << xorArray[g];
}
cout << "n";
cout << "Key length is: " << keyReg.size();
cout << "n";
for ( unsigned int i = 0; i < keyReg.size(); i++)
{
if (keyReg[i]==1)
{
count1++;
}
else {
count0++;
}
}
cout << "Number of 0's: " << count0 << "n";
cout << "Number of 1's: " << count1 << "n";
if ( keyReg.size()%2 ==0)
{
cout << "key length is even. n";
if (count1==count0)
{
cout << "Key is perfect! n";
}
else {
cout << "Key is not perfect! n";
}
}
else
{
cout << "key length is odd. n";
if ((count1==count0+1) || (count0==count1+1))
{
cout << "Key is perfect! n";
}
else {
cout << "Key is not perfect! n";
}
}
cin.get();
}
std::vector
对std::vector<bool>
进行了优化,并且向量的大小可以在运行时设置。
相关文章:
- 没有找到相关文章