用Java写一个计算器
时间: 2023-08-14 11:04:34 浏览: 50
好的,以下是一个简单的Java计算器程序:
```java
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the first number: ");
double num1 = scanner.nextDouble();
System.out.print("Enter the second number: ");
double num2 = scanner.nextDouble();
System.out.print("Enter the operator (+, -, *, /): ");
char operator = scanner.next().charAt(0);
double result;
switch(operator) {
case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
result = num1 / num2;
break;
default:
System.out.println("Invalid operator!");
return;
}
System.out.println(num1 + " " + operator + " " + num2 + " = " + result);
}
}
```
这个计算器程序首先要求用户输入两个数字和运算符,然后根据运算符计算结果并输出。注意要使用Scanner类来读取用户的输入。
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