scala交换数组相邻两位_Scala程序交换两个数字

ゝ一纸荒年。 2023-03-05 09:52 10阅读 0赞

scala交换数组相邻两位

Given two numbers, we have to swap them.

给定两个数字，我们必须交换它们。

**Example:**

**例：**

Input:
        a = 10
        b = 20
    
        Output:
        a = 20
        b = 10

## 1)使用第三个变量交换两个数字 **(**1) Swapping two numbers using third variable**)** ##

To swap two values, there is a simple approach is using a temporary variable that stores the element for swapping.

要交换两个值，有一种简单的方法是使用一个临时变量来存储要交换的元素。

**Algorithm:**

**算法：**

Let, variable *a* contains first value, variable *b* contains second value and *temp* is the temporary variable.

设变量*a*包含第一个值，变量*b*包含第二个值，而*temp*是临时变量。

Step 1: temp = a
        Step 2: a = b
        Step 3: b = temp

**Program:**

**程序：**

object myObject {
        
        def main(args: Array[String]) {
        
            var a = 10
            var b = 20
            
            println("Values before swapping:\t a= " + a + ", b= " + b)
            
            // swapping
            var temp = a
            a = b
            b = temp
            
            println("Values after swapping:\t a= " + a + ", b= " + b)
            
        }
    }

**Output**

**输出量**

Values before swapping:	 a= 10, b= 20
    Values after swapping:	 a= 20, b= 10

### 2)交换两个数字而不使用第三个变量 **(**2) Swapping two numbers without using third variable**)** ###

We can also swap two numbers without using the third variable. This method saves computation space hence is more effective.

我们也可以交换两个数字而无需使用第三个变量。 该方法节省了计算空间，因此更加有效。

Let, variable *a* contains first value, variable *b* contains second value.

设变量*a*包含第一个值，变量*b*包含第二个值。

Step 1: a = a + b
        Step 2: a = a - b
        Step 3: b = a - b

**Program:**

**程序：**

object myObject {
        
        def main(args: Array[String]) {
        
            var a = 10
            var b = 20
            
            println("Values before swapping:\t a= " + a + ", b= " + b)
            
            // swapping
            a = a + b
            b = a - b
            a = a - b
            
            println("Values after swapping:\t a= " + a + ", b= " + b)
            
        }
    }

**Output**

**输出量**

Values before swapping:	 a= 10, b= 20
    Values after swapping:	 a= 20, b= 10

> 翻译自: [https://www.includehelp.com/scala/swap-two-numbers.aspx][https_www.includehelp.com_scala_swap-two-numbers.aspx]

scala交换数组相邻两位

[https_www.includehelp.com_scala_swap-two-numbers.aspx]: https://www.includehelp.com/scala/swap-two-numbers.aspx