如何将输出更改为：abcabcabc [英] How do I change my output to: abcabcabc

问题描述

  class 设
 {
  public   static   void  main（ String  [] args）
 {
  char  c = ' 一个; 
 
  for （ int  i = 1; i< = 3; i ++） 
 {
  for （ int  j = 0; j< = 2; j ++ ）
 {
 System.out.print（c ++）; 
} 
} 
} 
} 
} / pre> 
 
 我尝试过： 
 
在之间增加c 循环

解决方案

当你想要你的程序做某事时，你需要告诉它。

你在哪里告诉你的程序在第一个'abc'后重新开始'a'？



有一个工具可以让你看到你的代码在做什么，它的名字是调试的。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，你就接近了一个bug。

你可以尝试这个

 char c = '一个'; 
 
 for（int i = 1; i< = 3; i ++）{
 for（int j = 0; j< = 2; j ++）{
 System。的out.print（C ++）; 
} 
 c ='a'; 
} 

在内循环中使用字符作为循环控件更容易。

的java> （ int  i =  0 ; i<  3 ; i ++） //  启动循环为零 
 {
  for （ char  c = '  a'; c< '  d'; c ++） //  从'a增加c 'to'c' 
 {
 System.out.print（c）; 
} 
} 
 System.out.println（  ）; 

class Let
{
    public static void main(String[] args)
    {
        char c='a';

        for(int i=1;i<=3;i++)
        {
            for(int j=0;j<=2;j++)
            {
                System.out.print(c++);
            }
        }
    }
}
}/pre>

What I have tried:

Incrementing c in between the for loops

解决方案

When you want your program to do something, you need to tell it.
Where do you tell your program to start again to 'a' after the first 'abc' ?

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.

you can try this

char c = 'a';

        for (int i = 1; i <= 3; i++) {
            for (int j = 0; j <= 2; j++) {
                System.out.print(c++);
            }
            c = 'a';
        }

Much easier to use the characters as the loop control in the inner loop.

for(int i = 0; i < 3; i++) // start loops at zero
{
    for(char c = 'a'; c < 'd'; c++) // increment c from 'a' to 'c'
    {
        System.out.print(c);
    }
}
System.out.println("");

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