C ++程序崩溃(数组和2指针binsearch函数)

时间:2012-10-31 00:28:12

标签: c++ arrays search pointers binary

当我运行此程序并输入一个值来搜索程序崩溃时(exe已停止工作,关闭程序)。一旦输入值65,我得到一个无限循环的数字未找到输入要搜索的值(-1退出):

以下是代码:

#include <iostream>
using namespace std;

void Search(int[], int * , int * );

int main()
{

  int i,KEY,num, array[] = {98,87,76,65,54};


  for(i=0;i<5;i++)
    cout << array[i] << " ";

  Search(array, &KEY, &num);

  cout << endl;
  system("pause");
  return 0;
}

void Search(int arr[5], int * current, int * numel)
{

  int low, high,search,N;

  cout << "\nWhat Number would you like to search for? (-1 to quit) : ";
  cin >> search;

  while(search!=-1)
  {
    low=0;
    high=N-1;
    while(low<=high)
    {
      *current=(low+high)/2;
      if (search > arr[*current])
        low=*current+1;
      else if(search<arr[*current])
        high=*current-1;
      else
        break;
    }
    if(arr[*current]==search)
      cout << "Number found at index " << *current << endl;
    else
      cout << "Number not found." << endl;
    cout << "Enter a value to search (-1 to quit) :";
  }
  return;
}

2 个答案:

答案 0 :(得分:1)

首先,如果所寻求的号码不在数组中,那么Search中的主循环就没有办法了。

然后您在high被赋予任何价值之前使用{{1}}。

可能还有其他问题。你是如何在开发它时测试它的?

答案 1 :(得分:0)

N未初始化,所以谁知道这句话:

high=N-1;

会吗?