数据结构
网络
关系型数据库管理系统
操作系统
Java
MS Excel
iOS
HTML
CSS
Android
Python
C 编程
C++
C#
MongoDB
MySQL
Javascript
PHP
物理
化学
生物
数学
英语
经济学
心理学
社会研究
时尚研究
法律研究利用 switch...case 编写简单计算器的 Java 程序
在本文中，我们将了解如何使用 switch-case 构造一个简单的计算器。switch 语句计算一个表达式，将表达式的值与 case 子句进行匹配，并执行与该 case 关联的语句。
以下是我们要执行的算术操作。
- 加法
- 减法
- 乘法
- 除法
- 取整除
- 模
下面演示了同样的内容 −
输入
假设我们的输入是 −
The two inputs: 40.0 and 12.0 Operator:%
输出
预期的输出将是 −
The result is 40.0 % 12.0 = 4.0
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
在这里，输入由用户根据提示输入。您可以在我们的coding ground 工具 
中实时地尝试此示例。
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;
}
}
}输出
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
在这里，整数已被预先定义好，其值被访问并在控制台中显示。
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;
}
}
}输出
The two numbers are defined as 40.0 and 12.0 The operator is defined as % 40.0 % 12.0 = 4.0
更新于： 2022 年 2 月 22 日
4 千 + 次浏览
广告