如何将字母字符串转换为整数并进行算术运算？

huangapple
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英文:

How do I convert an alphabetic string to int and do arithmetic on it?

问题

  1. public class ChangeCase {
  2.    String stringToCheck;
  4.   public int convertToIntPlusTen() {
  5.         String asciiValue = "";  // 创建用于存储转换后字符串的变量
  6.         final char[] chars = stringToCheck.toCharArray();  // 将原始字符串拆分为字符数组
  7.         for (int i = 0; i < chars.length; i++) {
  8.             asciiValue += String.valueOf((int) chars[i]);  // 计算每个字符的ASCII值并追加到新变量
  9.         }
  10.         int asciiInt = Integer.parseInt(asciiValue);  // 将包含数字字符的字符串转换为整数
  11.         asciiInt += 10;  // 对结果整数加上10
  12.         return asciiInt;  // 返回计算结果
  13.     }
  14. }
  16. public class AppDriver {
  17.     public static void main(String[] args) {
  18.        ChangeCase changeCase = new ChangeCase();
  19.         changeCase.stringToCheck = "Foxes";  // 要处理的字符串
  20.         changeCase.convertToIntPlusTen();  // 调用方法进行转换和计算
  21.     }
  22. }

注：代码中使用了一些注释来解释代码的功能。如果你需要更多关于代码的解释，可以随时提问。

英文:

Everywhere I look trying to find out how to convert a String to an int, the examples use a numeric string, i.e. they show how to change "123" into 123. That is not at all what I am trying to do. My string is alphabetic. I know this because the two previous methods required me, first, to check whether it contained uppercase characters, and then, convert it to all uppercase characters. I succeeded in doing both of these. Now the third method calls for converting it to an int, and performing an arithmetic function on it, and now I am stuck. I tried using .valueOf(), that is, the ascii numeric values of the characters, but it keeps throwing errors.

  1. public class ChangeCase {
  2.    String stringToCheck;
  4.   public int convertToIntPlusTen() {
  5.         // Create new field for the converted string
  6.         String asciiValue = &quot;&quot;;
  7.         // Break original string down to char array
  8.         final char[] chars = stringToCheck.toCharArray();
  9.         // Find the ascii value of each character and add it to the new field
  10.         for (int i = 0; i &lt; chars.length; i++) {
  11.             asciiValue += String.valueOf((int) chars[i]);
  12.         }
  13.         // Convert string of numeric characters to int
  14.         int asciiInt = Integer.parseInt(asciiValue);
  15.         // Add ten to the resulting int
  16.         asciiInt += asciiInt + 10;
  17.         StringBuilder sbf
  18.                 = new StringBuilder(&quot;&quot;);
  19.         sbf.append(asciiInt);
  21.         return asciiInt;
  22.     }
  23. }
  25. public class AppDriver {
  26.     public static void main(String[] args) {
  27.        ChangeCase changeCase = new ChangeCase();
  28.         changeCase.stringToCheck = &quot;Foxes&quot;;
  29.         changeCase.convertToIntPlusTen();
  30.     }
  31. }

Now since the ascii values of the characters are 'F' = 070, 'o' = 111, 'x' = 120, 'e' = 101, and 's' = 115, then I expected it to produce the numeric string "070111120101115," which would then become the int 070111120101115. Adding ten would make it 070111120101125, which is the expected output.

Instead I get:

  1. Exception in thread &quot;main&quot; java.lang.NumberFormatException: For input string: &quot;70111120101115&quot;
  2. 	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
  3. 	at java.lang.Integer.parseInt(Integer.java:583)
  4. 	at java.lang.Integer.parseInt(Integer.java:615)
  5. 	at mainpackage.SubChangeCase.convertToIntPlusTen(SubChangeCase.java:45)
  6. 	at mainpackage.AppDriver.main(AppDriver.java:133)

I'm thinking that maybe this is more of a logical error than an operational one, i.e. I may have approached the problem incorrectly in the first place. Because I see my stack trace does have the expected input string. Unfortunately, since almost every code example out there in internet world is about converting numeric strings, I have not found anything to help with this.

答案1

得分: 1

70111120101115对于一个 整数 来说太大了。你需要将它存储在一个 长整型 中。

你还犯了一个拼写错误 - 你实例化了错误的类。应该是 ChangeCase，而不是 SubChangeCase。

因此，你的类应该是：

  1. public class ChangeCase {
  2.     String stringToCheck;
  3.     
  4.     public long convertToIntPlusTen() {
  5.         // 创建一个新字段来存储转换后的字符串
  6.         String asciiValue = "";
  7.         // 将原始字符串分解为字符数组
  8.         final char[] chars = stringToCheck.toCharArray();
  9.         // 找到每个字符的ASCII值并添加到新字段中
  10.         for (int i = 0; i < chars.length; i++) {
  11.             asciiValue += String.valueOf((int) chars[i]);
  12.         }
  13.         // 将数字字符的字符串转换为长整型
  14.         long asciiInt = Long.parseLong(asciiValue);
  15.         asciiInt += asciiInt + 10;
  16.         StringBuilder sbf = new StringBuilder("");
  17.         sbf.append(asciiInt);
  18.     
  19.         return asciiInt;
  20.     }
  21. }

所以你的最终代码应该是：

  1. public class ChangeCase {
  2.     String stringToCheck;
  3.     
  4.     public long convertToIntPlusTen() {
  5.         // 创建一个新字段来存储转换后的字符串
  6.         String asciiValue = "";
  7.         // 将原始字符串分解为字符数组
  8.         final char[] chars = stringToCheck.toCharArray();
  9.         // 找到每个字符的ASCII值并添加到新字段中
  10.         for (int i = 0; i < chars.length; i++) {
  11.             asciiValue += String.valueOf((int) chars[i]);
  12.         }
  13.         // 将数字字符的字符串转换为长整型
  14.         long asciiInt = Long.parseLong(asciiValue);
  15.         asciiInt += asciiInt + 10;
  16.         StringBuilder sbf = new StringBuilder("");
  17.         sbf.append(asciiInt);
  18.     
  19.         return asciiInt;
  20.     }
  21. }
  23. public class AppDriver {
  24.     public static void main(String[] args) {
  25.         ChangeCase changeCase = new ChangeCase();
  26.         changeCase.stringToCheck = "Foxes";
  27.         changeCase.convertToIntPlusTen();
  28.     }
  29. }
英文:

70111120101115 is too big for an integer. You have to store it in a long

You also made a typo - you instantiated the wrong class. It's ChangeCase, not SubChangeCase

Therefore, your class should be:

  1.   public long convertToIntPlusTen() {
  2.         // Create new field for the converted string
  3.         String asciiValue = &quot;&quot;;
  4.         // Break original string down to char array
  5.         final char[] chars = stringToCheck.toCharArray();
  6.         // Find the ascii value of each character and add it to the new field
  7.         for (int i = 0; i &lt; chars.length; i++) {
  8.             asciiValue += String.valueOf((int) chars[i]);
  9.         }
  10.         // Convert string of numeric characters to int
  11.         long asciiInt = Long.parseLong(asciiValue);
  12.         asciiInt += asciiInt + 10;
  13.         StringBuilder sbf
  14.                 = new StringBuilder(&quot;&quot;);
  15.         sbf.append(asciiInt);
  17.         return asciiInt;
  18.     }

So your final code should be:

  1. public class ChangeCase {
  2.    String stringToCheck;
  4.   public long convertToIntPlusTen() {
  5.         // Create new field for the converted string
  6.         String asciiValue = &quot;&quot;;
  7.         // Break original string down to char array
  8.         final char[] chars = stringToCheck.toCharArray();
  9.         // Find the ascii value of each character and add it to the new field
  10.         for (int i = 0; i &lt; chars.length; i++) {
  11.             asciiValue += String.valueOf((int) chars[i]);
  12.         }
  13.         // Convert string of numeric characters to int
  14.         long asciiInt = Long.parseLong(asciiValue);
  15.         asciiInt += asciiInt + 10;
  16.         StringBuilder sbf
  17.                 = new StringBuilder(&quot;&quot;);
  18.         sbf.append(asciiInt);
  20.         return asciiInt;
  21.     }
  22. }
  24. public class AppDriver {
  25.     public static void main(String[] args) {
  26.        ChangeCase changeCase = new ChangeCase();
  27.         changeCase.stringToCheck = &quot;Foxes&quot;;
  28.         changeCase.convertToIntPlusTen();
  29.     }
  30. }

huangapple
  • 本文由 发表于 2020年10月7日 06:50:18
  • 转载请务必保留本文链接：https://go.coder-hub.com/64234831.html
  • java
  • string
  • value-of
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