Question

所以这是我的简单计算器代码。它在大多数情况下都有效，我试图在操作结束时创建一个循环，以允许用户选择执行另一个操作或退出。到目前为止，我已经尝试添加嵌套的if循环，但我一直收到错误。任何帮助都会有所帮助。我很新。

import java.util.Scanner;

public class SimpleCalculator {

public static void main(String[] args) {
    // Introduction to Calculator providing instructions to user
    Scanner input = new Scanner(System.in);
    int num1, num2, ans, Y, N;

    System.out.println("Welcome to Simple Calculator: Please enter \n" + 
                    "which mathimatical operation you would like to \n "
                    + "accomplish by imputing 1-addition, 2-subtraction \n"
                    + "3-multiplication, 4-division, 5-modulo");

    int Operation = input.nextInt();

    //Operation sequence for user to input which operation they would like to accomplish


    if (Operation == 1) {
        System.out.println("You have Choosen Addition");
        System.out.print("Enter your First number: ");
        num1 = (int) input.nextDouble();

        System.out.print("Enter your second number: ");
        num2 = (int) input.nextDouble();

        ans = num1 + num2;
        System.out.print("Answer is: " + ans);

        /*
         * Right here in the following I want to put something in to make this loop
         * so the user can make multiple calculation.
         * So far nothing has worked.
         */
        System.out.println("Would you like to do another calculation?\n " +
                            "Enter Y for Yes or N to Exit");


    }else if (Operation == 2){

        System.out.println("You have Choosen Subtraction");
        System.out.print("Enter your First number: ");
        num1 = (int) input.nextDouble();

        System.out.print("Enter your second number: ");
        num2 = (int) input.nextDouble();

        ans = num1 - num2;
        System.out.print("Answer is: " + ans);


    }else if (Operation == 3){

        System.out.println("You have Choosen Multiplication");
        System.out.print("Enter your First number: ");
        num1 = (int) input.nextDouble();

        System.out.print("Enter your second number: ");
        num2 = (int) input.nextDouble();

        ans = num1 * num2;
        System.out.print("Answer is: " + ans);



    }else if (Operation == 4){

        System.out.println("You have Choosen Division");
        System.out.print("Enter your First number: ");
        num1 = (int) input.nextDouble();

        System.out.print("Enter your second number: ");
        num2 = (int) input.nextDouble();

        ans = num1 / num2;
        System.out.print("Answer is: " + ans);


    }else if (Operation == 5){
        System.out.println("You have Choosen Modulo");
        System.out.print("Enter your First number: ");
        num1 = (int) input.nextDouble();

        System.out.print("Enter your second number: ");
        num2 = (int) input.nextDouble();

        ans = num1 % num2;
        System.out.print("Answer is: " + ans);

    }else{
        System.out.print("Invalid Operation, please try again.");
    }
}
}

Answer 1

你在这里走在正确的轨道上。我建议使用do-while循环。所以将整个部分从if (Operation == 1) {一直包含到最终的else语句中，如下所示：

do {
    /*
        if (Operation == 1) {
                 ...
                 ...
                 ...
        else {
                 ...
        }
    */
    System.out.print("Would you like to do another calculation? [Y/n] ");
} while (input.nextLine().toUpperCase().charAt(0) == 'Y');

Answer 2

我会将整个事情放在while循环中，最后询问是否要继续是的 - 它会循环回来不 - 你有它突破循环

简单计算器..试图添加循环

2 个答案: