import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("请输入第一个数：");
double num1 = scanner.nextDouble();
System.out.print("请输入第二个数：");
double num2 = scanner.nextDouble();
System.out.print("请选择运算符 (+、-、*、/)：");
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("不支持的运算符");
return;
}
System.out.println("结果：" + result);
}
}
该程序实现了从控制台读取两个数和一个运算符，并进行简单的四则运算。