用java写一个计算器代码
时间: 2023-11-20 15:04:55 浏览: 37
下面是一个简单的Java计算器代码示例:
```
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
double num1, num2, result;
char operator;
System.out.print("Please enter the first number: ");
num1 = sc.nextDouble();
System.out.print("Please enter the operator (+, -, *, /): ");
operator = sc.next().charAt(0);
System.out.print("Please enter the second number: ");
num2 = sc.nextDouble();
switch (operator) {
case '+':
result = num1 + num2;
System.out.println(num1 + " + " + num2 + " = " + result);
break;
case '-':
result = num1 - num2;
System.out.println(num1 + " - " + num2 + " = " + result);
break;
case '*':
result = num1 * num2;
System.out.println(num1 + " * " + num2 + " = " + result);
break;
case '/':
if (num2 == 0) {
System.out.println("Error: Cannot divide by zero.");
} else {
result = num1 / num2;
System.out.println(num1 + " / " + num2 + " = " + result);
}
break;
default:
System.out.println("Error: Invalid operator.");
break;
}
sc.close();
}
}
```
这个计算器程序要求用户输入两个数字和运算符,然后计算并输出结果。它使用了Scanner类来读取用户输入,并使用switch语句来根据运算符执行相应的计算。注意,除法运算需要特殊处理,因为不能除以零。