我正在尝试为一个 uni 项目制作一个随机数生成器。
我正在尝试实现一个函数来获取生成的这个数字列表的周期（数字开始重复之前的时间）。
当我编译并运行它时，它返回 507（这是正确的句点）。
然而，大约 50% 的时间它会返回分段错误。知道发生了什么：
#include<iostream>
#include<fstream>
#include<vector>
#include<math.h>
#include<ctime>
using namespace std;
class Random
{
public:
// Constructor
Random(int a, int b, int m)
{
this->setMagicNumbers(a,b,m);
}
// Function to set the magic numbers of the random number generator
void setMagicNumbers(int a, int b, int m)
{
this->A = a;
this->B = b;
this->M = m;
}
// Function that returns a list of uniformly distributed random numbers
vector<double> GetUniform(int N, double initialValue = time(0))
{
double currentNumber = initialValue;
vector<double> RandomNumbers;
for(int i = 0; i <= N; i++)
{
currentNumber = fmod((this->A*currentNumber) + this->B, this->M);
RandomNumbers.push_back(currentNumber / this->M); // The number is normalised here
}
return RandomNumbers;
}
private:
int A, B, M;
};
class NumberList
{
public:
// Function to add an element to the list
void push(double x)
{
this->v.push_back(x);
}
// Function to pop an element off the list
double pop()
{
if(v.size() > 0)
{
int popped = v.back();
v.pop_back();
return popped;
}
else
{
cout << "Cannot pop element off empty list." << endl;
return 0;
}
return 0;
}
// Function to get the value at a given location on the list
double getAt(int i)
{
return this->v[i];
}
// Function to set the value at a given location on the list
void setAt(int i, double value)
{
this->v[i] = value;
}
// Function to find the size of the list
unsigned int size()
{
return this->v.size();
}
// Function to get the vector itself
vector<double> getvector()
{
return this->v;
}
// Function to set the value of the vector itself
void setVector(vector<double> vec)
{
this->v = vec;
}
// Function to print the list of numbers as coordinates to a data file
void printCoordinates()
{
ofstream data("coordinates.dat");
for(unsigned int i = 0; i <= this->v.size(); i++)
{
data << this->v[i] << " " << this->v[i + 1] << "\n";
}
data.close();
}
// Function to print the list of numbers to the terminal
void print()
{
for(unsigned int i = 0; i <= this->v.size(); i++)
{
cout << this->v[i] << endl;
}
}
// Function to get the period of the list of numbers
int getPeriod()
{
int i = 2;
while(true)
{
if(isPeriod(i) == true)
{
return i;
}
else
{
i = i + 1;
}
}
}
private:
// Vector to hold the values for the list
vector<double> v;
// Function to test if 'i' is the period of the list
bool isPeriod(int i)
{
for(int j = 0; j != (i-1); j++)
{
if(this->getAt(j) != this->getAt(i + j))
{
return false;
}
}
return true;
}
};
int main()
{
Random RandNumGenerator(100,104001,714025); // Create a new random number generator with given magic numbers
NumberList numbers; // Create a blank list of numbers
numbers.setVector(RandNumGenerator.GetUniform(10000)); // Add 10000 random numbers to the list
numbers.printCoordinates(); // Print out the random numbers as coordinates to a data file
cout << numbers.getPeriod() << endl; // Print out the period of the random number list
return 0;
}
提前致谢。