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标题: java基础题目：四则运算符 [打印本页]

作者: xyz燕子 时间: 2016-9-20 20:14
标题: java基础题目：四则运算符

import java.util.Scanner;
public class Test {
public static void main(String[] args) {
  // TODO Auto-generated method stub
  System.out.println("==四则运算==");
  System.out.println("1.加");
  System.out.println("2.减");
  System.out.println("3.乘");
  System.out.println("4.除");
  System.out.println("0.退出");
  Scanner input = new Scanner(System.in);
  System.out.println("请输入0-4之间数：");
  int num = input.nextInt();
  if (num == 0) {
System.out.println("程序退出!");
System.exit(0);
  }
  System.out.println("请输入第一个数:");
  double num1 = input.nextDouble();

  System.out.println("请输入第二个数:");
  double num2 = input.nextDouble();
  double result=0;
  String flag="+";
  switch (num) {
  case 1:
            result=num1+num2;
break;
  case 2:
result=num1-num2;
flag="-";
break;
  case 3:
result=num1*num2;
flag="x";
break;
  case 4:
result=num1/num2;
flag="/";
break;
  }

  System.out.println(num1+flag+num2+"="+result);
}
}

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