What does ‘0’ do in Java?

Ascii characters are actually numbers. And 0 .. 9 digits are numbers starting from decimal 48 (0x30 hexadecimal).

'0' is 48
'1' is 49
...
'9' is 57

So to get the value of any character digit, you can just remove the ‘0’, ie 48.

'1' - '0' => 1
 49 -  48 => 1

If you don’t remove ‘0’ (48) the total sum will be over by 48 * numberOfDigits.

See an ascii table to locate digits in it.

Note that '0' is the character 0, not the string "0" containing the character '0'.

Related Posts:

  1. How to format strings in Java
  2. What exactly is Apache Camel?
  3. What is an instance variable in Java?
  4. How does the Java ‘for each’ loop work?
  5. How does the Java ‘for each’ loop work?
  6. What does “Could not find or load main class” mean?
  7. How do I create a file and write to it?
  8. When to use LinkedList over ArrayList in Java?
  9. How to convert a char to a String?
  10. How do you create a dictionary in Java? [closed]
  11. How do I declare and initialize an array in Java?
  12. Convert list to array in Java [duplicate]
  13. How can I use pointers in Java?
  14. How do I generate random integers within a specific range in Java?
  15. “Exception in thread “main” java.lang.IndexOutOfBoundsException: Index: 0, Size: 0″ with ArrayList?
  16. Raising a number to a power in Java
  17. Running JAR file on Windows 10
  18. How do I limit the number of decimals printed for a double?
  19. Unfortunately MyApp has stopped. How can I solve this?
  20. exception in thread ‘main’ java.lang.NoClassDefFoundError:
  21. java.io.FileNotFoundException: the system cannot find the file specified
  22. How to parse this string in Java?
  23. How to match “any character” in regular expression?
  24. Double array initialization in Java
  25. I want to declare an empty array in java and then I want do update it but the code is not working
  26. Convert .class to .java
  27. What does Scanner input = new Scanner(System.in) actually mean?
  28. Why is there no Constant feature in Java?
  29. Error creating bean with name ‘entityManagerFactory’ defined in class path resource : Invocation of init method failed
  30. Printing out a linked list using toString
  31. Using @RequestLine with Feign
  32. What is the best/simplest way to read in an XML file in Java application?
  33. Received fatal alert: handshake_failure through SSLHandshakeException
  34. DB2 SQL Error: SQLCODE=-204, SQLSTATE=42704
  35. Why would a “java.net.ConnectException: Connection timed out” exception occur when URL is up?
  36. HashSet vs. ArrayList
  37. FIFO based Queue implementations?
  38. How to import a .cer certificate into a java keystore?
  39. How to get the current working directory in Java?
  40. What is a safe way to create a Temp file in Java?
  41. Android java.lang.IllegalStateException: Could not execute method of the activity
  42. Java error: Comparison method violates its general contract
  43. “Cannot create generic array of ..” – how to create an Array of Map?
  44. Java and Windows – error: illegal escape character
  45. How should I copy Strings in Java?
  46. Bank Account Java Program
  47. List of all special characters that need to be escaped in a regex
  48. No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
  49. java.lang.ArithmeticException: / by zero
  50. Eclipse error, “The selection cannot be launched, and there are no recent launches”
  51. STS launch error – Java was started but returned exit code=13
  52. RecyclerView onClick
  53. Java, Shifting Elements in an Array
  54. error: bad operand types for binary operator ‘&&’
  55. Exception in thread “main” java.lang.ArithmeticException: / by zero
  56. Failed to load the JNI shared Library (JDK)
  57. “com.jcraft.jsch.JSchException: Auth fail” with working passwords
  58. java.util.NoSuchElementException – Scanner reading user input
  59. How would I use a while loop to keep requesting user input
  60. Array Required, but java.lang.String found
  61. Eclipse java debugging: source not found
  62. IntelliJ – Can’t start – “JAVA_HOME does not point to a valid JVM installation”
  63. difference between equals() and hashCode()
  64. Adding days to a date in Java
  65. The C# Shorthand getters and setters
  66. What’s the reason I can’t create generic array types in Java?
  67. How to pass an object from one activity to another on Android
  68. Finding the size of a char array in Java
  69. Android For loop
  70. Java project in Eclipse: The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files
  71. Replace a character at a specific index in a string?
  72. Error array dimension missing
  73. How to detect EOF in Java?
  74. fixing errors on a program to call methods in java
  75. How to Set the Background Color of a JButton on the Mac OS
  76. How to easily convert a BufferedReader to a String?
  77. How can I calculate a time difference in Java?
  78. Detecting a long press with Android
  79. How to increase the size of an array in Java?
  80. Cannot invoke toString() on the primitive type int
  81. Creating a Calendar using javafx
  82. A tool for calculating the big-O time complexity of Java code? [closed]
  83. How to print binary tree diagram in Java?
  84. Must qualify the allocation with an enclosing instance of type GeoLocation
  85. Unknown version of Tomcat was specified in Eclipse
  86. How to compare character ignoring case in primitive types
  87. intellij idea – Error: java: invalid source release 1.9
  88. How fix Error:java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException:
  89. Is it okay to throw NullPointerException programmatically?
  90. Android: how to create Switch case from this?
  91. Read next word in java
  92. Convert float to double without losing precision
  93. Exception in thread “AWT-EventQueue-0” java.lang.OutOfMemoryError: Java heap space
  94. How do the post increment (i++) and pre increment (++i) operators work in Java?
  95. Manually throw an exception
  96. Spring boot: Unable to start embedded Tomcat servlet container
  97. How does paintComponent work?
  98. toring and Retrieving ArrayList values from hashmap
  99. Could not find or load main class with a Jar File
  100. “uses unchecked or unsafe operations” [duplicate]

Leave a Comment