java - 不同方法中的变量放在一起

Question

import java.util.*;

public class projectOneAdamYoung {
public static void main(String[] args){
  System.out.println("Welcome to the AP Computer Science calculator!!");

  Scanner kb = new Scanner(System.in);

  System.out.print("Enter an expression, or quit to exit: ");
  String line = kb.nextLine();

  Scanner input = new Scanner(line);

  int redLight = 0;

  while(redLight != 1) {
  if(line.equalsIgnoreCase("quit")){

     System.out.println("Thanks for using this calculator!");
     redLight = 1;

  }else {

     if (input.hasNextDouble()) {
        String numFirst = input.next();
        String opperator = input.next();
        String numSecond = input.next();
        double num1 = Double.parseDouble(numFirst);
        double num2 = Double.parseDouble(numSecond);

           if (opperator.equals("+")) {
              calcAdd();
           }
           if (opperator.equals("*")) {
              calcMult();
           }
           if (opperator.equals("-")) {
              calcSub();
           }
           if (opperator.equals("/")) {
              calcDiv();
           }
           if (opperator.equals("^")) {
              calcExp();
           }

     }else {
        String opperator = input.next();
        String numFirst = input.next();
        double num1 = Double.parseDouble(numFirst);

           if (opperator.equals("|")) {
              calcAbs();
           }
           if (opperator.equals("v")) {
              calcSqrt();
           }
           if (opperator.equals("~")) {
              calcRound();
           }
           if (opperator.equals("s")) {
              calcSin();
           }
           if (opperator.equals("c")) {
              calcCos();
           }
           if (opperator.equals("t")) {
              calcTan();
           }
      }
  }
  }
  }

  public static void calcAdd() {
     System.out.println(num1 + " + " + num2 + " = " + (num1 + num2));
  }
  public static void calcSub() {
     System.out.println(num1 + " - " + num2 + " = " + (num1 - num2));
  }
  public static void calcMult() {
     System.out.println(num1 + " * " + num2 + " = " + (num1 * num2));
  }
  public static void calcDiv() {
     System.out.println(num1 + " / " + num2 + " = " + (num1 / num2));
  }
  public static void calcExp() {
     System.out.println(num1 + " ^ " + num2 + " = " + (pow(num1, num2)));
  }
  public static void calcAbs() {
     System.out.println(num1 + " | " + " = " + (abs(num1)));
  }
  public static void calcSqrt() {
     System.out.println(num1 + " v " + " = " + (sqrt(num1)));
  }
  public static void calcRound() {
     System.out.println(num1 + " ~ " + " = " + (round(num1)));
  }
  public static void calcSin() {
     System.out.println(num1 + " s " + " = " + (sin(num1)));
  }
  public static void calcCos() {
     System.out.println(num1 + " c " + " = " + (cos(num1)));
  }
  public static void calcTan() {
     System.out.println(num1 + " t " + " = " + (tan(num1)));
  }


}

我正在为学校开发一个计算器项目，需要帮助。这是我的所有代码，它无法编译，因为我用来完成操作的变量位于不同的方法中。我不知道如何通过其他人的工作来完成这项工作。

Answer 1

我全心全意同意 Luiggi 的评论(但还没有直接添加到该线程的观点)。

尝试调用，例如 calcAdd，如下所示:

  calcAdd(num1, num2);

并将其定义为:

  public static void calcAdd(double num1, double num2) {
     System.out.println(num1 + " + " + num2 + " = " + (num1 + num2));
  }

验证这是否修复了 calcAdd 的编译错误，然后对 calcSub 等进行类似的修复。这将需要几分钟的打字时间，但会更近一步。