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 ‘A’ through ‘Z’ and its code is less than radix + ‘A’ – 10. In this case, ch – ‘A’ + 10 is returned.
- The character is one of the lowercase Latin letters ‘a’ through ‘z’ and its code is less than radix + ‘a’ – 10. In this case, ch – ‘a’ + 10 is returned.
- The character is one of the fullwidth uppercase Latin letters A (‘\uFF21’) through Z (‘\uFF3A’) and its code is less than radix + ‘\uFF21’ – 10. In this case, ch – ‘\uFF21’ + 10 is returned.
- The character is one of the fullwidth lowercase Latin letters a (‘\uFF41’) through z (‘\uFF5A’) and its code is less than radix + ‘\uFF41’ – 10. In this case, ch – ‘\uFF41’ + 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:
import java.lang.*;
public class gfg {
public static void main(String[] args)
{
char c1 = '3' , c2 = '6' ;
int in1 = Character.digit(c1, 5 );
System.out.println( "Numeric value of " + c1 + " in radix 5 is " + in1);
int in2 = Character.digit(c2, 15 );
System.out.println( "Numeric value of " + c2 + " in radix 15 is " + in2);
}
}
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Output:
Numeric value of 3 in radix 5 is 3
Numeric value of 6 in radix 15 is 6
Program 2:
import java.lang.*;
public class gfg {
public static void main(String[] args)
{
char c1 = 'a' , c2 = 'z' ;
int in1 = Character.digit(c1, 5 );
System.out.println( "Numeric value of " + c1 + " in radix 5 is " + in1);
int in2 = Character.digit(c2, 15 );
System.out.println( "Numeric value of " + c2 + " in radix 15 is " + in2);
}
}
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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)
Last Updated :
06 Dec, 2018
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