Question

刚开始教自己如何编写java。第一部分是一个简单的数学方程式，用户必须找到'n'的值。有一个'if'或'else'，如果答案是正确的（21）我如何绕过else并运行程序的其余部分，如果'else'如何在两次尝试后终止程序？

import java.util.Scanner;
import java.util.Random;

public class Bot {

    public static void main(String[] args) {        
        System.out.println("(6*7)%2=n");
        int InQuestion;
        System.out.println("what is the value of ' n' in the equation");
        Scanner ScannedNumber = new Scanner (System.in);
        int n = ScannedNumber.nextInt();
        InQuestion= n;

        if (InQuestion==21)
            System.out.println("Access Allowed");
            //*If 'Access Allowed' then permit the rest of the program to run consequently
            //*passing the 'else' branch.
        else
            System.out.println("try again");

        for(n=0; n>2; n++);{
            int n1=ScannedNumber.nextInt();
            if (n1==21);
                System.out.println("Access Denied");
                System.exit(0);
        }

        System.out.println("Hello I Am Bot");
        System.out.println("What is Your Name?");
        Scanner VariableNamePerry=new Scanner(System.in);
        System.out.print("Hello," +VariableNamePerry.nextLine());
        Scanner VariableNamecalculate=new Scanner (System.in);
        System.out.println(" What can I do for you?");
        System.out.print(VariableNamecalculate.nextLine());
        System.out.print(" what?");
        Scanner VariableNameThatIsWhatIWantYouToDo=new Scanner (System.in);
        System.out.println("I Can Calculate The Square Of Any Number, If that Is What You Want?" +VariableNameThatIsWhatIWantYouToDo.nextLine());
        Scanner VariableNameOkay=new Scanner (System.in);
        System.out.println(VariableNameOkay.nextLine()+ (" then"));
        System.out.println("Give me a number...");

        Scanner VariableName1=new Scanner (System.in);
        for(int MyVar=0; MyVar<1000; MyVar++){
            int MyVar1 = VariableName1.nextInt(); 
            System.out.println(MyVar1*MyVar1);
            System.out.println("give me another number please?")
        }
    }
}

Answer 1

您希望在if和else语句周围添加块以限定它们。如果你想在两次尝试后停止，你可以使用while循环或while循环，并使用一个简单的计数器计算尝试次数，并且当它们错误时递增计数器。

Answer 2

您可以使用循环遍历代码的开头部分，直到授予访问权限或者他们的尝试用完为止。如果已经授予访问权限，那么在打开循环时只需使用某种指示符。

int attempts = 2;
boolean accessGranted = false;
for (int q = 0; q < attempts; q++){
    System.out.println("(6*7)%2=n");
    int InQuestion;
    System.out.println("what is the value of ' n' in the equation");
    Scanner ScannedNumber = new Scanner (System.in);
    int n = ScannedNumber.nextInt();
    InQuestion= n;

    if (InQuestion==21){
        System.out.println("Access Allowed");
        accessGranted = true;
        break;
    }
    else
        System.out.println("try again");
}
if (accessGranted){/*rest of program*/}

Answer 3

对于程序的继续，最好的方法是将实际的程序代码放在与main不同的空白处。

以下是一个例子：

public static void main(String[] args) {
    System.out.println("(6*7)%2=n");
    int InQuestion;
    System.out.println("what is the value of ' n' in the equation");
    Scanner ScannedNumber = new Scanner (System.in);
    int n = ScannedNumber.nextInt();
    InQuestion= n;

    if (InQuestion==21){
        System.out.println("Access Allowed");
        program(args);
     //*If 'Access Allowed' then permit the rest of the program to run consequently
     //*passing the 'else' branch.
    } else {
        System.out.println("try again");
        for(n=0; n>2; n++){
            int n1=ScannedNumber.nextInt();
            if (n1==21);
            System.out.println("Access Denied");
            System.exit(0);                
        }
    }
}

public static void program(String[] args){ 
    System.out.println("Hello I Am Bot");
    System.out.println("What is Your Name?");
    Scanner VariableNamePerry=new Scanner(System.in);
    System.out.print("Hello," +VariableNamePerry.nextLine());
    Scanner VariableNamecalculate=new Scanner (System.in);
    System.out.println(" What can I do for you?");
    System.out.print(VariableNamecalculate.nextLine());
    System.out.print(" what?");
    Scanner VariableNameThatIsWhatIWantYouToDo=new Scanner (System.in);
    System.out.println("I Can Calculate The Square Of Any Number, If that Is What You Want?" +VariableNameThatIsWhatIWantYouToDo.nextLine());
    Scanner VariableNameOkay=new Scanner (System.in);
    System.out.println(VariableNameOkay.nextLine()+ (" then"));
    System.out.println("Give me a number...");

    Scanner VariableName1=new Scanner (System.in);
    for(int MyVar=0; MyVar<1000; MyVar++){
        int MyVar1 = VariableName1.nextInt(); 
        System.out.println(MyVar1*MyVar1);
        System.out.println("give me another number please?");
    }
}

像Nkdy说的那样，你可以使用while循环添加到int，直到达到指定的限制。

用Java构建密码

3 个答案: