Question

import java.util.Scanner;

class calculator {
    void add(float a, float b)
    {
        System.out.print("Result: "+(a+b));
    }
    void sub(float a, float b)
    {
        System.out.print("Result: "+(a-b));
    }
    void mult(float a, float b)
    {
        System.out.print("Result: "+(a*b));
    }
    void div(float a, float b)
    {
        System.out.print("Result: "+(a/b));
    }
}

class Cal {
    public static void main(String args[]) {
        Scanner sc= new Scanner(System.in);

        do {
            System.out.print("Enter Two Operands: ");
            float a=sc.nextFloat();

            float b=sc.nextFloat();

            System.out.print("Press 1 for Addition\n Press 2 for
            Subtraction\n Press 3 for Multiplication\n Press 4 for 
            Division\n Press 5 for Exit\n");

            System.out.print("Enter your choice: ");
            int n=sc.nextInt();
            calculator c=new calculator();
            switch(n)
            {
                case 1: c.add(a,b);
                        break;
                case 2: c.sub(a,b);
                        break;
                case 3: c.mult(a,b);
                        break;
                case 4: c.div(a,b);
                        break;
                case 5: System.exit(0);
                default: System.out.print("Wrong Choice!!!");
            }
            System.out.print("Are you want to continue?: ");
            int con=sc.nextInt();
        } while (con==1);
    }
}

这是一个简单的计算器问题，但我遇到以下给定的错误：

PS H:\java> javac calculator.java

calculator.java:47: error: cannot find symbol
                }while(con==1);
                       ^
  symbol:   variable con
  location: class Cal
1 error

Answer 1

con变量在循环内部声明，while不可见。

在int con=0;循环开始之前声明do-while。并从循环中的int值分配中删除con。

我的Java代码获取编译错误。如何解决？

1 个答案: