开学日记2

今天我写了一个简单的计算器程序，能够执行加法、减法、乘法和除法。程序代码如下：

import java.util.Scanner;

public class Calculator {

public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("Enter first number: ");double num1 = scanner.nextDouble();System.out.print("Enter second number: ");double num2 = scanner.nextDouble();System.out.println("Choose an operation: +, -, *, /");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.printf("Error! operator is not correct");return;}System.out.printf("%.1f %c %.1f = %.1f", num1, operator, num2, result);
}

}