jsq.rar_jsq语言

import java.io.BufferedReader; import java.io.InputStreamReader; public class Mycount { public static void main(String[] args) { int a=0; double x=0; double y = 0; System.out.println("please enter the first value:"); InputStreamReader isrOfx=new InputStreamReader(System.in); BufferedReader brOfx=new BufferedReader(isrOfx); while (a == 0) { try { x = Double.parseDouble(brOfx.readLine().toString()); a++; } catch (Exception e) { System.out.println("please enter valid value:"); } } System.out.println("please enter the second value:"); InputStreamReader isrOfy=new InputStreamReader(System.in); BufferedReader brOfy=new BufferedReader(isrOfy); while (a == 1) { try { y = Double.parseDouble(brOfy.readLine().toString()); a++; } catch (Exception e) { System.out.println("please enter valid value:"); } } System.out.println("x="+x+" y="+y); System.out.println("please enter the operator:+£¬-£¬*£¬/"); InputStreamReader isrOfoperator=new InputStreamReader(System.in); BufferedReader brOfoperator=new BufferedReader(isrOfoperator); try { String operator=brOfoperator.readLine().toString(); if (operator.equals("+")) { System.out.println(x += y); } else if (operator.equals("-")) { System.out.println(x -= y); } else if (operator.equals("*")) { System.out.println(x *= y); } else if (operator.equals("/")) { System.out.println(x /= y); } else throw new Exception(); } catch (Exception e) { System.out.println("Valid operator is needed!"); } } }