java - 当用户输入 "N"时结束循环

Question

当用户选择"is"时，它会循环并重新开始。当用户选择 N 时，它应该结束程序，但我不确定我在这里错过了什么。这是一个程序，可以在向程序提供斜率和 y 截距时告诉您 x 和 y 值。

Java 文件

        int slope;
        int yintercept;
        String newEquation;
        boolean play = true; 


        System.out.print("Enter the slope: ");
        slope = input.nextInt();

        System.out.print("Enter y-intercept: ");
        yintercept = input.nextInt();

        System.out.printf("The equation of the line is: y = %dx + %d", slope, yintercept);

        System.out.print("\nWould you like to create a new equation... Y or N? ");
        newEquation = input.next();


            while (play)
            {
                if (newEquation.equals("Y"))
                {
                    System.out.print("Enter the slope: ");
                    slope = input.nextInt();

                    System.out.print("Enter y-intercept: ");
                    yintercept = input.nextInt();

                    System.out.printf("The equation of the line is: y = %dx + %d", slope, yintercept);

                    System.out.print("\nWould you like to create a new equation... Y or N? ");
                    newEquation = input.next();
                }
                if (newEquation.equals("N")){
                    play =false; 

                }
                else{
                    System.out.print("Enter the slope: ");
                    slope = input.nextInt();

                    System.out.print("Enter y-intercept: ");
                    yintercept = input.nextInt();

                    System.out.printf("The equation of the line is: y = %dx + %d", slope, yintercept);

                    System.out.print("\nWould you like to create a new equation... Y or N? ");
                    newEquation = input.next();
                }





            }
    }   
}

Answer 1

为什么if (newEquation.equals("Y"))和else部分有相同的代码？如果您希望用户只输入“Y”或“N”，那么您可以将 else 放在前面，如下所示:else if(newEquation.equals("N"))并删除else部分。

因为你编写它的方式，它测试输入是否为“Y”，然后在同一个循环迭代中第二次测试输入是否为“N”，所以这意味着你的程序采用斜率info 当它进入循环时两次，因为 else 仅指“N”。