Character data type...

 TARGET LANGUAGE:JAVA

THEORY:(DATA TYPE:Character and Boolean)

Character

• Data type used to store characters is char.
• Java uses UNICODE to represent characters
• Java char is 16 bit type
• The range of char is 0 to 65,536
• There are no negative char.

UNICODE-

Unicode provides a unique number for every character,

no matter what the platform, no matter what the program,

no matter what the language.

Unicode Table



EXAMPLE:

//Demonstrates char Data types

 

class charDemo1

{

  public static void main(String args[])

  {

    char ch1,ch2;

    ch1=88;

    ch2='Y';

    System.out.print("ch1 and ch2");

    System.out.println(ch1+" "+ch2);

  }

}



//ch1 and ch2:X Y

-Notice that ch1 is assigned 88,which is ASCII(and UNICODE) value of the corresponding letter X

 

class charDemo2

{

  public static void main(String args[])

  {

    char ch1,ch2;

    ch1='X';

    System.out.println("ch1:"+ch1);  

    ch1++;

   

    System.out.println("ch1:"+ch1);

  }

}



//ch1:X
//ch1:Y

-As ch1 is increamented the ASCII value is increamented.Thus second time in the output we get Y. 

BOOLEAN

Java has a primitive type,called Boolean for logical values.
It can have only one of the two values true,false.

EXAMPLE

class Booltest
{
  public static void main(String args[])
  {
   boolean b;
   b=false;
   System.out.println("b:"+b);

   b=true;
   System.out.println("b:"+b);  
   if(b)//a Boolean value can control if statement
   {
     System.out.print("This is executed");
   }
b=false;

   if(b)//This is not executed
   {
     System.out.print("This is not executed");
   }
  }
}

Output of relational operator in if statement is Boolean value
eg 10>9


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In the next publication  we shall deal with literals
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