将字符串中的数字相加

Question

我希望能够将两个数字的字符串分开，然后将它们相加，但我一直在获取每个字符的 int 值。如果我输入“55”作为字符串，我希望答案为 10。我该怎么做？

package org.eclipse.wb.swt;

import java.util.*;

public class ISBN13 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

      Scanner input = new Scanner(System.in);

      System.out.println("enter a string");
      String numbers = input.nextLine();  //String would be 55

      int num1=numbers.charAt(0); //5

      int num2=numbers.charAt(1); //5

      System.out.println(num1+num2); //the answer should be 10
    }
}

Answer 1

您正在获取字符的ascii值；您可以使用 Character.digit(char, int) 来获取数值。像，

String numbers = "55";
int num1 = Character.digit(numbers.charAt(0), 10);
int num2 = Character.digit(numbers.charAt(1), 10);
System.out.println(num1 + num2);

输出为（按要求）

Answer 2

您可以使用 string.toCharArray() 方法，然后将它们添加到 for 循环中

import java.util.Scanner;

public class MyClass {
    public static void main(String[] args) {
        Scanner scan = null;
        try {
            scan = new Scanner(System.in);
            String line = scan.nextLine();
            char[] charArray = line.toCharArray();
            int sum = 0;
            for (char character : charArray) {
                sum += Integer.parseInt(String.valueOf(character));
            }
            System.out.println(sum);
        } finally {
            scan.close();
        }
    }
}

Answer 3

int x = Character.getNumericValue(element.charAt(0));

将字符串中的数字相加

Adding numbers together from a String

java

string

add

character

char