Java Character digit() Method

Java Character digit(char ch, int radix) Method

The digit(char ch, int radix) method of character class returns the numeric value of the character. If the radix is not in the range MIN_RADIX<=radix<=MAX_RADIX or if the value of ch is not a valid digit in a particular radix, 1 is returned. A character is a valid digit if atleast one of the following is true.

The method digit() is true for the character and the Unicode decimal is less than the specified radix. In this case, the decimal digit value is returned.
If the character is one of the uppercase Latin letters 'A' to 'Z' and its code is less than the radix, for + 'A', -10 is returned and for ?'A', +10 is returned.
If the character is one of the lowercase Latin letters 'a' to 'z' and its code is less than the radix, for + 'a', -10 is returned and for -'a', +10 is returned.

Note: This method cannot handle the supplementary character.

Syntax

Parameter

The above method requires two parameters:

The character that needs to be converted
The radix

Return Value

The digit(char ch, int radix) method returns the numeric value represented by the character in the specified radix.

Example 1

import java.util.Scanner;
   public class JavaCharacterDigitExample1 {
     public static void main(String[] args) {
	 // Ask the user for the input
	    System.out.print("Enter the input of your choice:");
       // Use scanner to get the user input
           Scanner s = new Scanner(System.in);
	    	char[] value = s.nextLine().toCharArray();
      // ask for radix input
             System.out.print("Enter the radix:");
     // get the radix
	      int radix = s.nextInt();
    // close the scanner object
		 s.close();
	   for (char charval : value) {
		int digit = Character.digit(charval, radix);
	// print the result
     System.out.println("The numeric value of the character is returned"+" as: " + digit);
	   }
     }
}

Test it Now

Output:

Enter the input of your choice:4
Enter the radix:6
The numeric value of the character is returned as: 4

Example 2

public class JavaCharacterDigitExample2 {
   public static void main(String[] args) { 
     //Create two character_primitives char1 and char2.
	   char char1, char2;
    // assign values to ch1, ch2
	   char1 = '9';
	   char2 = '5';
   // create 2 int primitives a and b.
	   int a, b;
  // assign numeric value of ch1, ch2 to i1, i2 using radix
	   a = Character.digit(char1, 4);
	   b = Character.digit(char2, 8);
       System.out.println("The numeric value of " + char1 + " in radix 4 is:"+a);
       System.out.println("The numeric value of " + char2  + " in radix 8 is:"+b); 
      }
}

Test it Now

Output:

The numeric value of 9 in radix 4 is:-1
The numeric value of 5 in radix 8 is:5

Example 3

public class JavaCharacterDigitExample3 {
   public static void main(String args[]) {
     // Initialize the array
	char a[] = { 'a', 'b', 'c', 'd' }; 
    // Create the object obj
	 Character obj = new Character('a'); 
	 int digit = obj.digit(3, 6); 
	 System.out.println("The numerical value for the alphabets:'a', 'b', 'c', 'd' is given as "+digit);
	 char char1 = '5';
	 int store = Character.digit(char1, 6);
        System.out.println("The numeric value of " + char1 + " in radix 4 is: "+store);
	 }
}

Test it Now

Output:

The numerical value for the alphabets:'a', 'b', 'c', 'd' is given as -1
The numeric value of 5 in radix 4 is: 5

Java Character digit(int codePoint, int radix) Method

The digit(int codePoint, int radix) method of character class returns the numeric value of the character. If the radix is not in the range MIN_RADIX<=radix<=MAX_RADIX or if the value of ch is not a valid digit in a particular radix, -1 is returned. A character is a valid digit if atleast one of the following is true.

The method digit() is true for the character and the Unicode decimal is less than the specified radix. In this case, the decimal digit value is returned.
If the character is one of the uppercase Latin letters 'A' to 'Z' and its code is less than the radix, for + 'A', -10 is returned and for -'A', +10 is returned.
If the character is one of the lowercase Latin letters 'a' to 'z' and its code is less than the radix, for + 'a', -10 is returned and for -'a', +10 is returned.

Syntax

Parameter

The above method requires two parameters:

The codePoint is the character that needs to be converted
The radix

Return Value

The digit(int codePoint, int radix) method returns the numeric value represented by the character in the specified index.

Example 4

public class JavaCharacterdigit_Example1 {	
   public static void main(String[] args) {
      // Initialize a codepoint
	    int codepoint = 86;
     // Initialize the radix
	    int radix = 20;		
    // Conversion of codepoint to char
	    char ch = (char) codepoint;			
	    int digit = Character.digit(codepoint,radix);
	System.err.println("The character" + " has a numeric value as "+ digit+" using the radix "+radix);
	}
}

Test it Now

Output:

The character has a numeric value as -1 using the radix 20

Example 5

public class JavaCharacterdigit_Example2 {	
    public static void main(String[] args) {
	   // Initialize a codepoint
		int codepoint1 = 86;
		int codepoint2 = 15;
	  // Initialize the radix
		int radix1 = 69;
		int radix2 = 18;
	  // Conversion of codepoint to char
		char ch1 = (char) codepoint1;	
		char ch2 = (char) codepoint2;	
		int digit1 = Character.digit(codepoint1,radix1);
		int digit2 = Character.digit(codepoint2,radix2);
  System.out.println("The character" + " has a numeric value as "+ digit1+" using the radix "+radix1);
  System.out.println("The character" + " has a numeric value as "+ digit2+" using the radix "+radix2);
	}
}

Test it Now

Output:

The character has a numeric value as -1 using the radix 69
The character has a numeric value as -1 using the radix 18

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