c++ - 输出中的特定递归逆向程序问题

Question

我完成了我的递归反向(数组)C++ 程序，但是，它部分正确地输出，有一个额外的“10”，我相信这是因为我的 const int SIZE = 10。我不确定我在哪里犯了错误(s ) 在我的程序中，并希望就错误发生的位置提供一些建议。谢谢。任何帮助将不胜感激。这是我收到的输出:

Original Array:   9   2   6  11   0  18   4  13   2   7
Reversed Array:   7   2  13   4  18   0327053270532705  10

以下是我的代码:

#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <ctime>

const int SIZE = 10;
unsigned int seed = int (time(0));

using namespace std;

double random(unsigned int &seed);
void initialize(int a[]);
void print_array(int a[]);
void recursive_reverse_array(int a[], int[], int[]);

double random(unsigned int &seed)
{
  const int MODULUS = 15749;
  const int MULTIPLIER = 69069;
  const int INCREMENT = 1;
  seed  = ((MULTIPLIER *seed) + INCREMENT) % MODULUS;
  return double (seed)/double(MODULUS);
}

void initialize(int a[])
{
  for (int i = 0; i < SIZE; ++i)
     a[i] = (20 * (random(seed)));
}

void print_array (int a[])
{
  for (int i = 0; i < SIZE; ++i)
     cout << setw(4) << a[i];
  cout << endl;
}

void recursive_reverse_array(int a[],int num1, int num2)
{
  int k;
  if(num1 < num2)
  {
    a[num1] = a[num2];
    a[num2] = k;
    recursive_reverse_array(a, num1 + 1, num2 - 1);
  }
}

int main ()
{
  int arr[SIZE];
  cout << "Original Array:";
  initialize(arr);
  print_array(arr);
  recursive_reverse_array(arr, 0, SIZE - 1);
  cout << "Reversed Array:";
  print_array(arr);
  return 0;
}

Answer 1

您在代码中犯了一个愚蠢的错误。请查看下面的代码并用它替换您的代码。

   #include <iostream>
#include <cstdlib>
#include <iomanip>
#include <ctime>

const int SIZE = 10;
unsigned int seed = int (time(0));

using namespace std;

double random(unsigned int &seed);
void initialize(int a[]);
void print_array(int a[]);
void recursive_reverse_array(int a[], int[], int[]);

double random(unsigned int &seed)
{
  const int MODULUS = 15749;
  const int MULTIPLIER = 69069;
  const int INCREMENT = 1;
  seed  = ((MULTIPLIER *seed) + INCREMENT) % MODULUS;
  return double (seed)/double(MODULUS);
}

void initialize(int a[])
{
  for (int i = 0; i < SIZE; ++i)
     a[i] = (20 * (random(seed)));
}

void print_array (int a[])
{
  for (int i = 0; i < SIZE; ++i)
     cout << setw(4) << a[i];
  cout << endl;
}

void recursive_reverse_array(int a[],int num1, int num2)
{
  int k;
  if(num1 < num2)
  {
    k=a[num1];
    a[num1] = a[num2];
    a[num2] = k;

    recursive_reverse_array(a, num1 + 1, num2 - 1);
  }
}

int main ()
{
  int arr[SIZE];
  cout << "Original Array:";
  initialize(arr);
  print_array(arr);
  recursive_reverse_array(arr, 0, SIZE - 1);
  cout << "Reversed Array:";
  print_array(arr);
  return 0;
}

您必须在代码中使用 k = a[num1];。希望它能奏效。