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法律研究利用 switch...case 編寫簡單計算器的 Java 程式
在本文中，我們將瞭解如何使用 switch-case 構造一個簡單的計算器。switch 語句計算一個表示式，將表示式的值與 case 子句進行匹配，並執行與該 case 關聯的語句。
以下是我們要執行的算術操作。
- 加法
- 減法
- 乘法
- 除法
- 取整除
- 模
下面演示了同樣的內容 −
輸入
假設我們的輸入是 −
The two inputs: 40.0 and 12.0 Operator:%
輸出
預期的輸出將是 −
The result is 40.0 % 12.0 = 4.0
演算法
Step 1 - START Step 2 - Declare three values namely my_input_1, my_input_2 and my_result and declare a character value namely operator. Step 3 - Read the required values from the user/ define the values Step 4 - Define case statements which takes ‘operator’ value as switch case to calculate the sum, difference, multiplication, division, modulus. Step 5 - Pass the operator value to the case statements to calculate the arithmetic operation between the two inputs ‘my_input_1’ and ‘my_input_2’ Step 7 - Display the result Step 8 - Stop
示例 1
在這裡，輸入由使用者根據提示輸入。您可以在我們的coding ground 工具 
中即時地嘗試此示例。
import java.util.Scanner;
public class OperatorSwitch {
public static void main(String[] args) {
char operator;
Double my_input_1, my_input_2, my_result;
System.out.println("Required packages have been imported");
Scanner my_scanner = new Scanner(System.in);
System.out.println("A reader object has been defined ");
System.out.println("Enter the first number");
my_input_1 = my_scanner.nextDouble();
System.out.println("Enter the second number");
my_input_2 = my_scanner.nextDouble();
System.out.println("Enter any of the following operator: +, -, *, /, %");
operator = my_scanner.next().charAt(0);
switch (operator) {
case '+':
my_result = my_input_1 + my_input_2;
System.out.println(my_input_1 + " + " + my_input_2 + " = " + my_result);
break;
case '-':
my_result = my_input_1 - my_input_2;
System.out.println(my_input_1 + " - " + my_input_2 + " = " + my_result);
break;
case '*':
my_result = my_input_1 * my_input_2;
System.out.println(my_input_1 + " * " + my_input_2 + " = " + my_result);
break;
case '/':
my_result = my_input_1 / my_input_2;
System.out.println(my_input_1 + " / " + my_input_2 + " = " + my_result);
break;
case '%':
my_result = my_input_1 % my_input_2;
System.out.println(my_input_1 + " % " + my_input_2 + " = " + my_result);
break;
default:
System.out.println("The operator you have selected is invalid");
break;
}
}
}輸出
Required packages have been imported A reader object has been defined Enter the first number 40 Enter the second number 12 Choose any of the following operator: +, -, *, /, % % 40.0 % 12.0 = 4.0
示例 2
在這裡，整數已被預先定義好，其值被訪問並在控制檯中顯示。
public class OperatorSwitch {
public static void main(String[] args) {
char operator;
Double my_input_1, my_input_2, my_result;
my_input_1 = 40.0;
my_input_2 = 12.0;
operator = '%';
System.out.println("The two numbers are defined as " +my_input_1 +" and " +my_input_2);
System.out.println("The operator is defined as " +operator);
switch (operator) {
case '+':
my_result = my_input_1 + my_input_2;
System.out.println(my_input_1 + " + " + my_input_2 + " = " + my_result);
break;
case '-':
my_result = my_input_1 - my_input_2;
System.out.println(my_input_1 + " - " + my_input_2 + " = " + my_result);
break;
case '*':
my_result = my_input_1 * my_input_2;
System.out.println(my_input_1 + " * " + my_input_2 + " = " + my_result);
break;
case '/':
my_result = my_input_1 / my_input_2;
System.out.println(my_input_1 + " / " + my_input_2 + " = " + my_result);
break;
case '%':
my_result = my_input_1 % my_input_2;
System.out.println(my_input_1 + " % " + my_input_2 + " = " + my_result);
break;
default:
System.out.println("The operator you have selected is invalid");
break;
}
}
}輸出
The two numbers are defined as 40.0 and 12.0 The operator is defined as % 40.0 % 12.0 = 4.0
更新於： 2022 年 2 月 22 日
4 千 + 次瀏覽
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