代码有什么问题？ [英] What's wrong with code ?

问题描述

我想找出带有参数的偶数和奇数？



我尝试了什么：

i want to find out even and odd number with arguments ??

What I have tried:

public class modulus {

	public static void main(String[] args) {
	if (args.length <1) {
	 
	System.out.println("please pass 1 argument");
	
	System.exit(0);
	
	}
	int num = Integer.parseInt(args[0]); 
	int res;
	res= num % 2 ; 
	  if ( res == 0 )
	        System.out.println("Entered number is even");
	     else
	        System.out.println("Entered number is odd");
	}
}

推荐答案

即使只是使用一些更好的缩进也可以帮助您的代码。

请先执行此操作（见下文），以便我们更清楚地看到可能出现的问题。

接下来，您要导入System.out.println的软件包吗？



发布你得到的错误然后我们可以告诉你更多。

Even just using a bit of better indentation helps your code.
Please do that first (see below) so we can see more clearly what might be wrong.
Next, are you importing the packages for System.out.println?

Post the error that you get then we can tell you more.

public class modulus 
{

   public static void main(String[] args) {
     if (args.length <1) {

      System.out.println("please pass 1 argument");
  
      System.exit(0);

      }  //end of if

      int num = Integer.parseInt(args[0]); 
      int res;
      res= num % 2 ; 

      if ( res == 0 )
         System.out.println("Entered number is even");
      else
         System.out.println("Entered number is odd");
   } // end of main()
} // end of class 

引用：

代码有什么问题？

使用调试器并自己查看。



有一个工具可以让你看到代码在做什么，它的名字是调试器。它也是一个很好的学习工具，因为它向你展示了现实，你可以看到哪种期望与现实相符。

当你不明白你的代码在做什么或为什么它做它做的时候，答案就是答案是调试器。

使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量。



调试器 - 维基百科，免费的百科全书 [ ^ ]

http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html [ ^ ]

https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html [ ^ ]

调试器在这里向您展示你的代码正在做，你的任务是与它应该做的事情进行比较。

调试器中没有魔法，它没有找到错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。

Use the debugger and see by yourself.

There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html[^]
https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

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