Question

用户必须提供起点并指明序列应该是升序还是降序。到目前为止它开始计数并且永不停止。如何在将其递增10之后使其停止。我是否会使用if语句让用户选择使其升序或降序？

class Program
{
    static void Main(string[] args)
    {
        int val;

        Console.WriteLine("Please enter a number!");

        val = Int32.Parse(Console.ReadLine());

        for (int i = val; i <= (val + 10); val++)
            Console.WriteLine(val);

        Console.ReadLine();
    }
}

Answer 1

它永远不会因为你增加val而停止，i总是会小于val + 10（你永远不会增加i）。您应该增加i，并在循环中使用i。

static void Main(string[] args)
{           
    int val;            

    Console.WriteLine("Please enter a number!");

    val = Int32.Parse(Console.ReadLine());                                 

    for (int i = val; i <= (val + 10); i++)
      Console.WriteLine(i);            

    Console.ReadLine();         

}

对于升序与降序部分，您还需要从用户那里获取第二个输入，如果他选择降序，请创建一个循环来检查i >= (val - 10)是否为i--每次迭代代替。

Answer 2

using System;
using System.Linq;

class Sample {
    static void Main(){
        const char down = '-';

        Console.Write("Please enter a number! n[{0}]:", down);
        string input = Console.ReadLine();

        char ch = input.Last();
        int diff = (ch == down) ? -1 : 1;
        int val = Int32.Parse(input.TrimEnd(down));

        for(var i = 1; i <= 10; i++, val += diff)
            Console.WriteLine(val);
    }
}

<强>样本

Please enter a number! n[-]:10-
10
9
8
7
6
5
4
3
2
1

Please enter a number! n[-]:5
5
6
7
8
9
10
11
12
13
14

Answer 3

更改为：

static void Main(string[] args)
{           
    int val;            

    Console.WriteLine("Please enter a number!");

    val = Int32.Parse(Console.ReadLine());                                 

    for (int i = val; i <= (val + 10); i++)
        Console.WriteLine(i);            

    Console.ReadLine();         
}

Answer 4

static void Main(string[] args)
{           
int val, isDecrement;            
Console.WriteLine("Please enter a number!");
val = Int32.Parse(Console.ReadLine());      

Console.WriteLine("Please enter 1 to go Descending order!");   
isDecrement = Int32.Parse(Console.ReadLine()); 

if(isDecrement ==1)
{
   for (int i = val; i >= (val - 10); i--)
     Console.WriteLine(i);            
}
else
{
for (int i = val; i <= (val + 10); i++)
  Console.WriteLine(i);            
}
Console.ReadLine();         

}

输出一个十个数字的序列到控制台

4 个答案: