基本的Java加法计算器

Question

import java.util.Scanner;

public class HelloWorldJavaMain 
{

    public static void main(String[] args) 
    {

        Scanner userInputScanner = new Scanner(System.in);

        System.out.println("Enter the first number.");
        int inputA = userInputScanner.nextLine();

        System.out.println("Enter the second number.");
        int inputB = userInputScanner.nextLine();

        int sumOfInputs = inputA + inputB;

        System.out.println(inputA + " + " + inputB  + " = " + sumOfInputs);

    }

}

有人可以告诉我哪里出错了吗？

Answer 1

int inputA = userInputScanner.nextLine();

应该改为

int inputA = userInputScanner.nextInt();

因为nextline没有返回int。或者你可以使用

Integer.parseInt(userInputScanner.nextLine())

与inputB

相同

Answer 2

使用userInputScanner.nextInt();

userInputScanner.nextLine（）读取一个String行。

Answer 3

Scanner userInputScanner = new Scanner(System.in);
int inputA = userInputScanner.nextInt();
int inputB = userInputScanner.nextInt();
int sumOfInputs = inputA + inputB;
System.out.println(inputA + " + " + inputB  + " = " + sumOfInputs);

检查此http://ideone.com/0eR41r