[英]How to increase charAt value inside a while loop
I'm trying to find a way to increase a value that is using charAt, but want to be able to update it while inside a while loop. 我正在尝试找到一种方法来增加使用charAt的值,但希望能够在while循环内进行更新。 Below is the current code that I have. 下面是我当前的代码。 I have tried recreating the variable inside of the loop and adding ++ to the end to increase the value, but I receive unexpected type errors. 我尝试在循环内部重新创建变量,并在末尾添加++以增加值,但是我收到意外的类型错误。
I am trying to have it take a value that you enter (ie 3124) and concatenate each value and then add them together. 我试图让它接受您输入的值(即3124)并连接每个值,然后将它们加在一起。 So based on the example, it would give a value of 10. 因此,基于该示例,它的值为10。
public static void main(String[] args) {
int Num, counter, i;
String str1;
str1 = JOptionPane.showInputDialog("Enter any number: ");
Num = str1.length();
counter = 0;
i = Integer.parseInt(Character.toString(str1.charAt(0)));
NumTot = 0;
while (counter <= Num)
{
NumTot = i;
counter++;
i = Integer.parseInt(Character.toString(str1.charAt(0++)));
}
System.exit(0);
}
Idea: 理念:
Example code: 示例代码:
public class IntegerSum {
public static void main(String[] args) {
int i = 3124;
int sum = 0;
while (i > 0) {
sum += i % 10;
i /= 10;
}
System.out.println("Sum: " + sum);
}
}
Output: 输出:
Sum: 10
Note: My answer is based on your requirement of "I am trying to have it take a value that you enter (ie 3124) and concatenate each value and then add them together. So based on the example, it would give a value of 10." 注意:我的回答是基于您的要求“我正在尝试让它输入一个值(即3124),然后将每个值连接起来,然后将它们相加。因此,根据示例,它的值为10 。”
Some modifications to your program : 对您的程序进行了一些修改:
public static void main (String[] args) throws java.lang.Exception
{
int Num, counter, i;
String str1;
int NumTot = 0;
str1 = "3124";
Num = str1.length();
counter = 0;
while (counter < Num)
{
i = Integer.parseInt(Character.toString(str1.charAt(counter)));
NumTot = NumTot + i;
counter++;
}
System.out.println(NumTot);
}
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