循环群是什么_什么是循环？

比眉伴天荒 2022-12-06 15:25 196阅读 0赞

循环群是什么

A loop is a way of repeating lines of [code][] more than once. The block of code contained within the loop will be executed again and again until the condition required by the loop is met. For example, you could set up a loop to print out the even numbers between 1 and 100. The code that gets executed each time the loop is run will be the printing out of an even number, the condition the loop is looking to meet is reaching 100 (i.e., 2 4 6 8....96 98).

循环是一种重复执行多行[代码][code]的方法。 循环中包含的代码块将一次又一次地执行，直到满足循环所需的条件为止。 例如，您可以设置一个循环以打印出1到100之间的偶数。每次运行循环时执行的代码将是打印出一个偶数，该循环希望满足的条件是达到100(即2 4 6 8 .... 96 98)。

There are two types of loops:

有两种类型的循环：

*  **Indeterminate** \- An indeterminate loop does not know how many times it will run. For example, you could search through an int [array][] looking for a specific value. The most logical way would be to search each element of the array in order until you find the right value. You don't know if the value is in the first element or the last so the number of times you loop around checking the next element of the array is unknown. Indeterminate loops are the `while` and `do..while` loops.
    
    **不确定** \-不确定循环不知道它将运行多少次。 例如，您可以搜索一个int [数组以][array]查找特定值。 最合乎逻辑的方法是依次搜索数组的每个元素，直到找到正确的值。 您不知道该值是在第一个元素中还是在最后一个元素中，因此循环检查该数组的下一个元素的次数是未知的。 不确定的循环是`while`和`do..while`循环。
 *  **Determinate** \- A determinate loop knows exactly how many times it will loop. For example, if you want to know how much money you'll be paid for the next twelve months minus tax you could perform the wage calculation 12 times. The determinate loop in Java is the `for` loop.
    
    **确定** \-确定循环确切知道它将循环多少次。 例如，如果您想知道接下来的十二个月内将向您支付多少钱减去税，您可以执行12次工资计算。 Java中的确定循环是`for`循环。

## 例子 **(** Examples **)** ##

An indeterminate `while` loop to search for the number 10 in a randomly ordered `int` array:

一个不确定的`while`循环，用于在随机排序的`int`数组中搜索数字10：

//int array of random numbers
    int[] numbers = {1, 23, 56, 89, 3, 6, 9, 10, 123};
    //a boolean variable that will act as the condition for the loop
    boolean numberFound = false;
    int index = 0;
    //this loop will continue running until numberFound = true
    while (!numberFound)
    {
    System.out.println("We're looping around..");
    if (numbers[index] == 10)
    {
    numberFound = true;
    index++;
    System.out.println("We've found the number after " + index + " loops");
    }
    index++;
    }

A determinate `for` loop to display all the even numbers between 1 and 100:

确定的`for`循环，显示1到100之间的所有偶数：

int number = 0;
    //loop around 49 times to get the even numbers
    //between 1 and 100
    for (int i=1;i

> 翻译自: [https://www.thoughtco.com/loops-2034224][https_www.thoughtco.com_loops-2034224]

循环群是什么

[code]: https://www.thoughtco.com/what-is-javascript-2037921
[array]: https://www.thoughtco.com/working-with-arrays-2034318
[https_www.thoughtco.com_loops-2034224]: https://www.thoughtco.com/loops-2034224