仅使用 for 循环和条件语句的 Javascript 打印方块

Javascript print square using for loop and conditional statement only(仅使用 for 循环和条件语句的 Javascript 打印方块)

问题描述

刚开始我的大学课程，在 javascript 方面有点挣扎.我被要求使用任何字符显示一个正方形，但是，解决方案必须结合 for 循环和 if 语句.

Just started my uni course, struggling a little with javascript. I have been asked to display a square using any character, however, the solution must combine for loops and if statements.

这是我到目前为止所拥有的，我感觉非常接近，但我无法让第二行显示.我知道这可以通过两个 for 循环来完成(一个用于变量的迭代，另一个用于空格).但这不是我被要求解决这个问题的方式.

This is what I have so far and I feel pretty close but I just can't get the second line to display. I know this can be done via two for loops, (one for iteration of the variable and another for spaces). But this is not how I have been asked to solve this problem.

这是我的代码:

var size = 3;
let i;


for(i = 0; i < size; i++) {
print ("*");
if (size === i){ 
println (""); 
}
}

就上下文而言，这一切都发生在教授自制的学习环境中.

For context, this is all taking place int he professors homemade learning environment.

推荐答案

您可以使用嵌套的 for 循环，并在每行填充后换行.

You could use nested for loops and take a line break after each filled line.

function print(s) { document.getElementById('out').innerHTML += s; }
function println(s) { document.getElementById('out').innerHTML += s + '
'; }

var size = 5,
    i, j;

for (i = 0; i < size; i++) {
    for (j = 0; j < size; j++) {
        print("*");
    }
    println("");
}

<pre id="out"></pre>

单循环，检查 i 是否不等于 0，如果余数为零，则添加换行符.

Single loop with a check if i is unequal to zero and if the remainder is zero, then add a line break.

使用:

• ===身份/严格相等运算符检查类型和值，例如如果两者都是数字并且值是否相同，

• === identity/strict equality operator checks the type and the value, for example if both are numbers and if the value is the same,

!== 非恒等式/严格不等式 操作符和上面一样，但是它检查它的对立面，

!== non-identity/strict inequality operator it is like above, but it checks the oposite of it,

% 余数 运算符，返回一个数的余数，除法返回一个整数.

% remainder operator, which returns a rest of a number which division returns an integer number.

&& 逻辑 AND 运算符，检查两边并返回最后一个值，如果两者都是 truthy (像任何数组、对象、非零数字、非空字符串、true)或第一个，如果它是 falsy(如 undefined、null，0，''(空字符串)，false，truthy的反义词).

&& logical AND operator, which check both sides and returns the last value if both a truthy (like any array, object, number not zero, a not empty string, true), or the first, if it is falsy (like undefined, null, 0, '' (empty string), false, the oposite of truthy).

function print(s) { document.getElementById('out').innerHTML += s; }
function println(s) { document.getElementById('out').innerHTML += s + '
'; }

var size = 5,
    i;

for (i = 0; i < size * size; i++) {
    if (i !== 0 && i % size === 0) {
        println("");
    }
    print("*");
}

<pre id="out"></pre>

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