Question

该程序从用户处获取输入数字并按升序对其进行排序。

当用户点击“Enter”而不输入整数时，程序将停止取数并对循环进行排序。

我的节目并没有停止接受数字，而是陷入无限循环的数字。那是为什么？

#include <stdio.h>
#include "genlib.h"

SortIntegerArray()
{
    int i, k, n, Array[200];

    for (i = 0; i < 200; ++i)
    {
        for (k = i+1; k < 200; ++k)
        {
            if (Array[i] > Array[k])
            {
                n = Array[k];
                Array[i] = Array[k];
                Array[k] = n;
            }
        }
    }
}


main()
{

    int i, k, n, Array[200], number;

    i = 0;
    n = 0;

    printf("Enter numbers\n");
    number = GetInteger();

    for (i = 0; i < 200; ++i)
    {
        if (number == "")
        {
            break;
        }
            scanf("%d", &Array[i]);
            }


    printf("The input array is: %d", Array[200]);

    SortIntegerArray();

    printf("The sorted array is: %d", Array[200]);

}

Answer 1

试试这段代码

    public void ConfigureServices(IServiceCollection services)
    {
        // Add Application settings to the services container.
        services.Configure<AppSettings>(Configuration.GetSubKey("AppSettings"));

        // Add EF services to the services container.
        services.AddEntityFramework()
            .AddSqlServer()
            .AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"]));
        // Add Identity services to the services container.
        services.AddIdentity<ApplicationUser, IdentityRole>()
            .AddEntityFrameworkStores<ApplicationDbContext>()
            .AddDefaultTokenProviders();

        // Configure the options for the authentication middleware.
        // You can add options for Google, Twitter and other middleware as shown below.
        // For more information see http://go.microsoft.com/fwlink/?LinkID=532715
        services.Configure<FacebookAuthenticationOptions>(options =>
        {
            options.AppId = Configuration["Authentication:Facebook:AppId"];
            options.AppSecret = Configuration["Authentication:Facebook:AppSecret"];
        });

        services.Configure<MicrosoftAccountAuthenticationOptions>(options =>
        {
            options.ClientId = Configuration["Authentication:MicrosoftAccount:ClientId"];
            options.ClientSecret = Configuration["Authentication:MicrosoftAccount:ClientSecret"];
        });

        // Add MVC services to the services container.
        services.AddMvc();

        services.AddSingleton(a =>
        {
            //AppSettings settingsModel = ?? //GET CONFIGURATION SETTINGS FILLED 

            // TECHNICAL ARTIFICE TO RETRIEVE CURRENT SETTINGS
            //var settingsModel = new AppSettings();
            //var config = Configuration.GetSubKey("AppSettings");
            //foreach (var item in typeof(AppSettings).GetProperties().Where(b => b.CanWrite))
            {
                //item.SetValue(settingsModel, config.Get(item.Name));
            }

            return new FooService(settingsModel);
        });

        //Uncomment the following line to add Web API services which makes it easier to port Web API 2 controllers.
        //You will also need to add the Microsoft.AspNet.Mvc.WebApiCompatShim package to the 'dependencies' section of project.json.
        services.AddWebApiConventions();
    }

Answer 2

GetInteger返回一个整数，因此if (number == "")永远不会评估为true，循环永远不会中断。

scanf返回读取的项目数，如果用户未输入任何内容，则返回零。因此，您可以使用返回值来打破循环。

我不确定GetInteger实际上做了什么，但它看起来并不像真的需要，因为你正在填充数组以使用scanf在for循环中进行排序。

for (i = 0; i < 200; ++i)
{
    if (scanf("%d", &Array[i]) < 1)
    {
        break;
    }

}

Answer 3

在您对函数中的任何内容进行排序之前，必须将数组传递给您的函数。打印或排序Array[200]毫无意义。您必须迭代Array[i]（或某个索引）才能实际访问各个成员。当你将Array传递给sort函数时，你还必须传递数组中的元素数量（否则无法确定函数中的元素数量（除非你使用了一个sentinel元素，等等）。。）

话虽如此，你的排序功能也是不正确的。使用简单的bubblesort进行校正，提供以下示例：

#include <stdio.h>
// #include "genlib.h"

int *SortIntegerArray (int *array, int n)
{
    int i, j;
    for (i = 0; i < n; i++) {
        for (j = 0; j < (n-1); j++) {
            if (array[j] > array[j + 1]) {
                int temp;
                temp = array[j + 1];
                array[j + 1] = array[j];
                array[j] = temp;
            }
        }
    }
    return array;
}


int main (void)
{

    int i, n, number;
    int Array[200] = {0};
    i = n = number = 0;

    printf ("\nEnter number of elements for array below:\n\n");
    printf ("  number of elements: ");
    scanf (" %d", &n);

    printf ("\nEnter the array values:\n\n");
    for (i = 0; i < n; i++)
    {
        printf ("  input: ");
        scanf (" %d", &Array[i]);
    }

    printf ("\nThe array values are:\n\n");
    for (i = 0; i < n; i++)
        printf ("  Array[%3d] : %d\n", i, Array[i]);

    SortIntegerArray (Array, n);

    printf ("\nThe sorted array values are:\n\n");
    for (i = 0; i < n; i++)
        printf ("  Array[%3d] : %d\n", i, Array[i]);

    printf ("\n");

    return 0;
}

<强>输入/输出

$ ./bin/sort_loop

Enter number of elements for array below:

  number of elements: 6

Enter the array values:

  input: 9
  input: 2
  input: 5
  input: 3
  input: 8
  input: 4

The array values are:

  Array[  0] : 9
  Array[  1] : 2
  Array[  2] : 5
  Array[  3] : 3
  Array[  4] : 8
  Array[  5] : 4

The sorted array values are:

  Array[  0] : 2
  Array[  1] : 3
  Array[  2] : 4
  Array[  3] : 5
  Array[  4] : 8
  Array[  5] : 9

如果您有任何疑问，请与我们联系。

按升序排序整数列表 - C.

3 个答案: