Java：要求继续
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Java: Ask for continue
提问by user2764700
I'm trying to make a calculator. These operators: x, +, -, /work fine.
我正在尝试制作一个计算器。这些运算符：x, +, -,/工作正常。
But I want the user to be able to do 2 things after he gets the answer on his math problem.
但是我希望用户在得到数学问题的答案后能够做两件事。
Ask user if he wants to continue.
询问用户是否要继续。
- If user types in
yeshe gets to put in 2 numbers that it counts again. - If the user types
nojust shut down.
- 如果用户输入，
yes他可以输入 2 个数字，再次计数。 - 如果用户键入
no只是关闭。
Here's my code:
这是我的代码：
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner Minscanner = new Scanner(System.in);
int nr1 = Integer.parseInt(Minscanner.nextLine());
int nr2 = Integer.parseInt(Minscanner.nextLine());
int yes = Integer.parseInt(Minscanner.nextLine());//trying to fix reset
int ans =0;
int reset = J;/trying to make it reset if user types in yes
String anvin = Minscanner.nextLine();
if(anvin.equalsIgnoreCase("+")) {
ans = nr1 + nr2;
}
else if(anvin.equalsIgnoreCase("-")) {
ans = nr1 - nr2;
}
else if(anvin.equalsIgnoreCase("*")) {
ans = nr1 * nr2;
}
else if(anvin.equalsIgnoreCase("/")) {
ans = nr1 / nr2;
System.out.println(ans);
}
if(anvin.equalsIgnoreCase("yes")) {
return;
}
}
}
回答by Ruchira Gayan Ranaweera
You can refactor your code as bellow. This may help you
你可以重构你的代码如下。这可能会帮助你
boolean status=true;
while (status){
Scanner scanner = new Scanner(System.in);
Scanner scanner1 = new Scanner(System.in);
System.out.println("Enter your two numbers one by one :\n");
int num1 = scanner.nextInt();
int num2 = scanner.nextInt();
System.out.println("Enter your operation you want to perform ? ");
int ans =0;
String option = scanner1.nextLine();
if(option.equalsIgnoreCase("+")) {
ans = num1 + num2;
}
else if(option.equalsIgnoreCase("-")) {
ans = num1 - num2;
}
else if(option.equalsIgnoreCase("*")) {
ans = num1 * num2;
}
else if(option.equalsIgnoreCase("/")) {
ans = num1 / num2;
}
System.out.println(ans);
System.out.println("you want to try again press y press j for shutdown\n");
Scanner sc = new Scanner(System.in);
String input=sc.nextLine();
if (input.equalsIgnoreCase("J")) {
System.exit(0);
} else if (input.equalsIgnoreCase("Y")) {
status = true;
}
}
回答by Eel Lee
Put your code in a
把你的代码放在一个
do {
...
} while (condition);
loop, and in your case the condition would be something like wantToContinueif user say "yes".
循环，在您的情况下，条件类似于wantToContinue用户说“是”。
Then the program will not end unless user no longer wants to calculate.
然后程序不会结束，除非用户不再想计算。
