如何使用javascript嵌套循环打印加号（+） [英] How do I print plus(+) using javascript nested loops

问题描述

我设法用嵌套循环创建一个x形状，但我试图将代码转换为加号并且无法做到。我写的函数从用户获取输入并在该维度中写入x，但我想将其转换为加号。我知道问题在于if语句，但我还没能把它弄好。



我尝试过的事情：

i managed to create an x shape with nested loops but i am trying to convert the code into a plus sign and cant do it. the function i wrote takes an input from the user and writes an x in that dimension, but i want to convert it to plus sign. i know the problem lies in the if statement, but i havent been able to get it right.

What I have tried:

function drawPlus(){
 var inputVal = document.getElementById("input").value;
  if (inputVal % 2 !== 0) { // checks if the user's entered value is even
    document.getElementById("output").innerHTML = ""; 
    for (var row = 0; row <= inputVal; row++) {   
      for (var col = 0; col < inputVal; col++) {  
        if (row == col + 1 ||  col == parseInt(inputVal) - row )  
          document.getElementById("output").innerHTML += "O";
        else
          document.getElementById("output").innerHTML += "...";
        }
        document.getElementById("output").innerHTML += "<br>";
    }
  }else {
    alert('the value should be odd')
  }

}

推荐答案

Quote：

我设法用嵌套循环创建一个x形状，但我试图将代码转换为加号不能这样做。

i managed to create an x shape with nested loops but i am trying to convert the code into a plus sign and cant do it.

你确定这是你的代码吗？

任何人都会告诉你画一个'+'符号比'x'更容易'，所以你不能这样做很奇怪。



不是一个完整的爆炸解决方案，而是一个建议：

开始于画一个' - '，然后添加垂直条。

Are you sure it is your code ?
Anyone will tell you that drawing a '+' sign is easier that an 'x', so it is weird that you cann't do it.

Not a full blowup solution, but an advice:
Start by drawing a '-', then add the vertical bar.

if (row == col + 1 ||  col == parseInt(inputVal) - row )
  document.getElementById("output").innerHTML += "O";
else
  document.getElementById("output").innerHTML += "...";
}

建议：对白色和黑色使用相同数量的符号，如OO和..和'Courier new'字体（固定间距），所以每个点都相同。



我们不做你的HomeWork。

HomeWork不会在乞求其他人做你的工作时测试你的技能，它会让你思考并帮助你的老师检查你对你所学课程的理解以及你应用它们时遇到的问题。

你的任何失败都会帮助你的老师发现你的弱点并设定补救措施。

你的任何失败都会帮助你了解什么有效，什么无效，被称为'试错'学习。

所以，试一试，重读课程并开始工作。如果您遇到特定问题，请显示您的代码并解释这个问题，我们可能会提供帮助。



作为程序员，您的工作是创建算法解决特定问题，你不能依赖别人永远为你做，所以有一段时间你必须学会​​如何。而且越快越好。

当你要求解决方案时，就像试图通过培训其他人来学习开车一样。

创建算法基本上是找到数学并做出必要的调整以适应你的实际问题。



发展的概念就像这个词所暗示的那样：系统地使用科学和满足特定目标或要求的技术知识。 BusinessDictionary.com [ ^ ]

这与有一个不一样快速谷歌并放弃，如果我找不到正确的代码。

Advice : use the same number of signs for 'white' and 'black', like "OO" and ".." and 'Courier new' font (fixed spacing), so than every dot is same size.

We do not do your HomeWork.
HomeWork is not set to test your skills at begging other people to do your work, it is set to make you think and to help your teacher to check your understanding of the courses you have taken and also the problems you have at applying them.
Any failure of you will help your teacher spot your weaknesses and set remedial actions.
Any failure of you will help you to learn what works and what don't, it is called 'trial and error' learning.
So, give it a try, reread your lessons and start working. If you are stuck on a specific problem, show your code and explain this exact problem, we might help.

As programmer, your job is to create algorithms that solve specific problems and you can't rely on someone else to eternally do it for you, so there is a time where you will have to learn how to. And the sooner, the better.
When you just ask for the solution, it is like trying to learn to drive a car by having someone else training.
Creating an algorithm is basically finding the maths and make necessary adaptation to fit your actual problem.

The idea of "development" is as the word suggests: "The systematic use of scientific and technical knowledge to meet specific objectives or requirements." BusinessDictionary.com[^]
That's not the same thing as "have a quick google and give up if I can't find exactly the right code".

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