Character.digit() in Java with examples
The java.lang.Character.digit() is an inbuilt method in java which returns the numeric value of the character ch in the specified radix. It returns -1 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 the specified radix. A character is a valid digit if at least one of the following is true:
- The method isDigit is true of the character and the Unicode decimal digit value of the character (or its single-character decomposition) is less than the specified radix. In this case the decimal digit value is returned.
- The character is one of the uppercase Latin letters βAβ through βZβ and its code is less than radix + βAβ β 10. In this case, ch β βAβ + 10 is returned.
- The character is one of the lowercase Latin letters βaβ through βzβ and its code is less than radix + βaβ β 10. In this case, ch β βaβ + 10 is returned.
- The character is one of the fullwidth uppercase Latin letters A (β\uFF21β) through Z (β\uFF3Aβ) and its code is less than radix + β\uFF21β β 10. In this case, ch β β\uFF21β + 10 is returned.
- The character is one of the fullwidth lowercase Latin letters a (β\uFF41β) through z (β\uFF5Aβ) and its code is less than radix + β\uFF41β β 10. In this case, ch β β\uFF41β + 10 is returned.
Syntax:
public static int digit(char ch, int radix)
Parameters:The function accepts two parameters which are described below:
- ch- This is a mandatory parameter which specifies the character to be converted.
- radix- This is a mandatory parameter which specifies radix.
Return value: This method returns the numeric value represented by the character in the specified radix.
Below programs demonstrates the above method:
Program 1:
// Java program to illustrate the // Character.digit() method import java.lang.*; public class gfg { public static void main(String[] args) { // create and assign value // to 2 character objects char c1 = '3' , c2 = '6' ; // assign the numeric value of c1 to in1 using radix int in1 = Character.digit(c1, 5 ); System.out.println( "Numeric value of " + c1 + " in radix 5 is " + in1); // assign the numeric value of c2 to in2 using radix int in2 = Character.digit(c2, 15 ); System.out.println( "Numeric value of " + c2 + " in radix 15 is " + in2); } } |
Output:
Numeric value of 3 in radix 5 is 3 Numeric value of 6 in radix 15 is 6
Program 2:
// Java program to illustrate the // Character.digit() method // when -1 is returned import java.lang.*; public class gfg { public static void main(String[] args) { // create and assign value // to 2 character objects char c1 = 'a' , c2 = 'z' ; // assign the numeric value of c1 to in1 using radix int in1 = Character.digit(c1, 5 ); System.out.println( "Numeric value of " + c1 + " in radix 5 is " + in1); // assign the numeric value of c2 to in2 using radix int in2 = Character.digit(c2, 15 ); System.out.println( "Numeric value of " + c2 + " in radix 15 is " + in2); } } |
Output:
Numeric value of a in radix 5 is -1 Numeric value of z in radix 15 is -1
Reference: https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#digit(char,%20int)
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