如何将for循环转换为while循环来计算相当于华氏温度java的摄氏温度 [英] How do I convert for loop to while loop to calculates the celsius equivalent to fahrenheit temperatures java

问题描述

我试图打印出两张计算相当于华氏温度的摄氏温度的表格。我有一个for循环表，但是当我尝试为我的代码添加while循环时，它只打印出一个表而不是两个表。我做错了什么？



我尝试过：



这是我的代码：

I trying to print out two tables that that calculates the Celsius equivalent to Fahrenheit Temperatures. I have one table for loop, but when I try to put while loop for my code it just print out one table not two table. What I am doing wrong?

What I have tried:

here is my code:

public class TempLoops {
	
	public static void main(String args[]) {
		int fahrenheit = 0;
		
        System.out.println("Fahrenheit    Celsius");
		
        for ( fahrenheit = 0; fahrenheit <= 300; fahrenheit+= 20) {    
            
			System.out.printf("%5d        ",fahrenheit);
            double Celsius = (fahrenheit-32.0) * (5.0/9.0);  // formula for celsius to fahrenheit conversion
			
            System.out.printf("%1.1f", Celsius );
            System.out.println();
		}		
		while ( fahrenheit <= 300) {   
		  fahrenheit+= 20;
            System.out.println("Fahrenheit    Celsius");
			System.out.printf("%5d        ",fahrenheit);
            double Celsius = (fahrenheit-32.0) * (5.0/9.0);  // formula for celsius to fahrenheit conversion
			
            System.out.printf("%1.1f", Celsius );
            System.out.println();
		}
	}
}

推荐答案

可能的问题是你的for循环和while循环之间循环你好你没有重置华氏值，所以当它看到你的时候，你的华氏变量可能等于320，因为它不是< = 300（你的while循环条件）......你的while循环永远不会运行。



在for循环结束和while循环开始之间，将fahrenheit的值重置为0.

The likely issue is that between your for loop and while loop yo u aren't resetting the value of fahrenheit so when it gets to your while look, your fahrenheit variable is probably equal to 320 and because its not <= 300 (your while loop condition)...your while loop never runs.

Between the end of your for loop and the beginning of your while loop, reset the value of fahrenheit to 0.

fahrenheit = 0;
while(fahrenheiht <= 300)
{

在while循环开始时注意 fahrenheit 的值。



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 [ ^ ]



掌握Visual Studio 2010中的调试 - 初学者指南 [ ^ ]

使用Visual Studio 2010进行基本调试 - YouTube [ ^ ]

HTTP：//docs.or acle.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您的代码正在做什么，您的任务是与它应该做什么进行比较。

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

Pay attention to the value of fahrenheit at start of while loop.

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[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]
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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