java标准计算器代码
时间: 2023-06-21 12:05:30 浏览: 54
以下是一个简单的 Java 标准计算器代码示例:
```java
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double num1, num2, result;
char operator;
System.out.print("Enter first number: ");
num1 = scanner.nextDouble();
System.out.print("Enter operator (+, -, *, /): ");
operator = scanner.next().charAt(0);
System.out.print("Enter second number: ");
num2 = scanner.nextDouble();
switch (operator) {
case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
if (num2 == 0) {
System.out.println("Error! Division by zero is not allowed.");
return;
}
result = num1 / num2;
break;
default:
System.out.println("Error! Invalid operator.");
return;
}
System.out.println(num1 + " " + operator + " " + num2 + " = " + result);
}
}
```
运行结果:
```
Enter first number: 10
Enter operator (+, -, *, /): *
Enter second number: 5
10.0 * 5.0 = 50.0
```
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