fig2.cpp

从用户得到一组数据

#include <iostream>
using namespace std;

#define Sentinel -1;
int MaxElements=250;

/************************函数声明****************************/
void GiveInstructions();  
int GetIntegerArray(int array[]);                   
void ReverseIntegerArray(int array[], int n);       
void SortIntegerArray(int array[], int n);         
void PrintIntegerArray(int array[], int n);


/*************************主函数*****************************/
int main()
{
    int array[250];
	int n;

    GiveInstructions();

    n = GetIntegerArray(array);

    cout << "The reverse array is as follows: " << endl;
	ReverseIntegerArray(array, n);
    PrintIntegerArray(array, n);

	cout << "The sorted array is as follows: " << endl;
	SortIntegerArray(array, n);
	PrintIntegerArray(array, n);
	return 0;
}

/***********************提示信息*****************************/
void GiveInstructions()
{
	cout << "Enter numbers, one per line, ending with the\n"
         << "sentinel value -1  The program will then\n"
         << "display those values in reverse order and sorted order.\n";
}

int GetIntegerArray(int array[])//从用户获得数组中的元素
{
    for (int i = 0; i < MaxElements; i++)
		array[i] = 0;
	cout << " ? ";
	cin >> array[0];
	int n = 1;
	while (n < MaxElements)
	{
		cout << " ? ";
		cin >> array[n];
		if (array[n] != -1)
		{
		    int t = 0;
			while (t < n)
			{
				if (array[t] == array[n])
			 	    break;
				else
					t++;
			}
			if (t<n)
				cout << array[n] << " is already in the array. Please input again." << endl;
			else
				n++;
		}
		else
		{
			n = n-1;
			break;
		}
	}
    return n;
}

/*************************将数组中的元素倒倒序**************************/
void ReverseIntegerArray(int array[], int n)
{
  for (int p = 0; 2 * p < n + 1; p++)
  {
     int temp = array[p];
     array[p] = array[n - p];
     array[n - p] = temp;
  }
}

/***********************将数组中的元素由小到大排列*********************/
void SortIntegerArray(int array[],int n)
{
   int MinIndex; /* 最小元素的下标 */
   int pass, j; /* 用来扫描数组的下标 */
   int temp; /* 用来交换数组元素的临时变量 */
   
   for (pass = 0; pass < n; pass++)/* 从下标pass开始扫描数组 */
   {
	   MinIndex = pass;
	   
	   for (j = pass + 1;j <= n;j++)
	   {
		   if (array[j] < array[MinIndex])
			   MinIndex = j;/* 如果找到更小元素,将该位置赋给minIndex */
	   }
       if (MinIndex != pass)
	   {
		   temp = array[pass];
		   array[pass] = array[MinIndex];
		   array[MinIndex] = temp;
	   }
   }

}

/******************************打印数组*****************************/
void PrintIntegerArray(int array[], int n)
{
  for (int i = 0; i <= n; i++)
  {
	  cout << array[i] << " "; 
  }
  cout << endl;
}

/*********************************************************************/