将Python算法转换为C＃。问题在于 [英] Converting a Python algorithm to C#. The problem lies

问题描述

这是C＃代码。我的问题是它打印七个1和一个2，当它应该按顺序打印vals列表。 （如排序）。

使用System; 
使用System.Collections.Generic; 
 
命名空间ConsoleApp5 
 {
 class程序
 {
 static void Main（）
 {
 int [] vals = { 6,5,3,1,8,7,2,4}; 
 // List< int> vals = new List< int> {6,5,3,1,8,7,2,4}; 
 int n = 8; 
 
 
 for（int i = 0; i< n; i ++）//< =或<？ 
 {
 
 for（int j = 0; j< n  -  1; j + = 1）
 {
 if（vals [j]> vals [j + 1]）$ ​​b $ b {
 vals [j] = vals [j + 1]; 
 vals [j + 1] = vals [j]; 
} 
 
} 
} 
 
 foreach（int num in vals）
 {
 Console.WriteLine（vals [num ]）; 
} 
 
 
 
 
} 
} 
} 

这是python代码：

 vals = [6,5,3,1,8 ，7,2,4] 
 
n = len（vals）
 for i in range（n）：
 for j in range（0，n-1）：
如果vals [j]> vals [j + 1]：
 vals [j]，vals [j + 1] = vals [j + 1]，vals [j] 
 
 print（vals）

我的尝试：



我是尝试将它从一个数组改为一个列表，反之亦然，没有改变任何东西。

我已经尝试了很多关于循环的东西，目前它们按预期工作。



谢谢。

解决方案

  if （vals [j] >  vals [j +  1 ] ）
 {
 vals [j] = vals [j +  1 ]; 
 vals [j +  1 ] = vals [j]; 
} 

您无法像这样交换两个单元格。将 vals [j] 设置为 vals [j + 1] 的值，然后设置 vals [j + 1] 到 vals [j] 的值，这已经是的先前值vals [j + 1] 。你需要将第一项复制到这样的临时变量：

  if （vals [j] >  vals [j +  1 ]）
 {
  int  temp = vals [j];  //  保存原始值 
 vals [j] = vals [j +  1 ]; 
 vals [j +  1 ] = temp;  //   vals中的原始值[j]  
} 

This is the C# code. My problem is that it prints seven 1s and a 2, when it is supposed to print the vals list in order. (like a Sort).

using System;
using System.Collections.Generic;

namespace ConsoleApp5
{
    class Program
    {
        static void Main()
        {
            int[] vals = {6, 5, 3, 1, 8, 7, 2, 4};
            //List<int> vals = new List<int> { 6, 5, 3, 1, 8, 7, 2, 4 };
            int n = 8;
            

            for (int i = 0; i < n; i++)//<= or <?
            {
                
                for (int j = 0; j < n - 1; j += 1 )
                {
                    if (vals[j] > vals[j + 1])
                    {
                        vals[j] = vals[j + 1];
                        vals[j + 1] = vals[j];
                    }
                    
                }
            }

            foreach (int num in vals)
            {
                Console.WriteLine(vals[num]);
            }
            
            
            
            
        }
    }
}

and this is the python code:

vals = [6,5,3,1,8,7,2,4]

n = len(vals)
for i in range(n):
     for j in range(0, n-1):
            if vals[j] > vals[j+1]:
                      vals[j], vals[j+1] = vals[j+1], vals[j]

print(vals)

What I have tried:

I've tries changing it from an array to a list and vise versa, didn't change anything.
I've tried a lot of things with the loops, at present they work as intended.

Thank you.

解决方案

if (vals[j] > vals[j + 1])
{
    vals[j] = vals[j + 1];
    vals[j + 1] = vals[j];
}

You cannot exchange two cells like that. You set vals[j] to the value of vals[j + 1], and then set vals[j + 1] to the value of vals[j], which is already the previous value of vals[j + 1]. You need to copy the first item to a temporary variable like this:

if (vals[j] > vals[j + 1])
{
    int temp = vals[j]; // save original value
    vals[j] = vals[j + 1];
    vals[j + 1] = temp; // original value in vals[j]
}

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