public class LianXIDemo03 {
public static void main(String[] args) {
//计算机器
Scanner scanner = new Scanner(System.in);
System.out.println("输入1234,加减乘除");
double num1,num2,num3;
boolean s = true;
num1 = 0;
num2 = 0;
num3 = 0;
while(s){
int i = scanner.nextInt();
switch(i){
case 1:
System.out.println("输入第一个加法数字");
num1 = scanner.nextDouble();
System.out.println("第二个");
num2 = scanner.nextDouble();
num3=num1+num2;
System.out.println(num3);
break;
case 2:
System.out.println("输入第一个减法数字");
num1 = scanner.nextDouble();
System.out.println("第二个");
num2 = scanner.nextDouble();
num3=num1-num2;
System.out.println(num3);
break;
case 3:
System.out.println("输入第一个乘法数字");
num1 = scanner.nextDouble();
System.out.println("第二个");
num2 = scanner.nextDouble();
num3=num1*num2;
System.out.println(num3);
break;
case 4:
System.out.println("输入第一个除法数字");
num1 = scanner.nextDouble();
System.out.println("第二个");
num2 = scanner.nextDouble();
num3=num1/num2;
break;
default:
System.out.println("输入错误");
break;
}
}
scanner.close();
}
}