Convert Char Type Variable to Int in Java

   public class CharToInt {
   public static void main(String[] args) {
  
     // create char variables
     char c1 = '9';
     char c2 = 'e';
  
     // convert char variables to int
     // ASCII value of characters is assigned
     int num1 = c1;
     int num2 = c2;
  
     // print the values
     System.out.println(num1);    
     System.out.println(num2);    
   }
 } 

 57
 101

• In this program, there are two variables c1 ,c2 of the type char. These variables are passed as values for two other integer type variables.
• The values assigned to the integer variables here won’t be the characters themselves but their ASCII representation.
• Thus, the integer variables would contain ‘57’ and ‘101’ which are equivalent to the ASCII of 9 and e respectively.

   public class CharToInt {
   public static void main(String[] args) {
  
     // create char variables
     char c1 = '9';
     char c2 = 'j';
  
     // convert char variable to int
     // Use getNumericValue()
     int num1 = Character.getNumericValue(c1);
     int num2 = Character.getNumericValue(c2);
  
     // print the numeric value of characters
     System.out.println(num1);    
     System.out.println(num2);    
   }
 } 

 9
 19

• In this program, a Character class method called getNumericValue() is used for the conversion of data types. This method takes up variables in char and returns them in int.
• It can be seen that the numeric representation of char type variables is retrieved by using the getNumericValue() method. Both the characters 9 and j are converted into their numerical forms with the new type as integer.

   public class CharToInt {
   public static void main(String[] args) {
  
     // create char variables
     char c1 = '2';
     char c2 = '9';
  
     int num1 = Integer.parseInt(String.valueOf(c1));
     int num2 = Integer.parseInt(String.valueOf(c2));
  
     // print numeric value
     System.out.println(num1);    
     System.out.println(num2);    
   }
 } 

2
9

• In this program, an Integer class method called parseInt() is used for the conversion of data types. This method takes up variables in int and returns them in char form.
• In the following expression: Integer.parseInt(String.valueOf(c1))
• The char type variable ‘a’ is first converted to a String type variable using String.valueOf(c1).
• Then the converted variable of String type is passed as a parameter in Integer.parseInt() method for further conversion into integer type.

• The variable ‘c1’ is first converted to String and then to int since the method Integer.parseInt() only takes up String variables as parameters.

   public class CharToInt {
   public static void main(String[] args) {
     char c1 = '9';
     char c2 = '3';
  
     // convert char variables to int by subtracting with char 
     int num1 = c1 - '0';
     int num2 = c2 - '0';
  
     // print numeric value
     System.out.println(num1);    
     System.out.println(num2);    
   }
 } 

9
3

• In this program, conversion from char type to int type takes place by subtracting the character ‘0’ from the given char variable.
• In the line:  int num1 = c1 - '0';
• 0 is being subtracted from the char variable c1. Here, both the characters c1 and ‘0’ are implicitly converted into integer type variables and thus the value stored in num1 will consist of an int value. Since subtracting 0 from any number will return the number itself, thus num1 and num2 contain the integer values 9 and 3 from their corresponding char values ‘9’ and ‘3’.