Java - 如何添加分隔的数字

Question

这是我的代码:

Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
String happyNumber = input.nextLine();

int happyNum = Integer.parseInt(happyNumber);
happyNum *= happyNum;

int answer = 0;  
for (char ch : Integer.toString(happyNum).toCharArray()) {
    int digit = ch - '0';
    answer = digit * digit;
    System.out.print(answer);
}

例如:

Enter a number:7

The output is:1681

现在，伙计们，我想将 16 和 81 相加。总和将是 97。我已经尝试过研究，但仍然无法解决这个简单的问题。

Answer 1

使用总和来跟踪您的总数 =)

Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
String happyNumber = input.nextLine();

int happyNum = Integer.parseInt(happyNumber);
happyNum *= happyNum;


int answer = 0;
int sum = 0; //NEW
for (char ch : Integer.toString(happyNum).toCharArray()) {
    int digit = ch - '0';
    answer = digit * digit;
    sum = sum + answer;//NEW
    System.out.print(answer);

}
System.out.print("Sum: " + sum);//NEW

尝试并理解代码的更改。我在添加的每一行中添加了//NEW