Casting Primitives

[Kaur Manpreet]

Hi All,

In the following program if line 1 is uncommented the code throws a compile time error, whereas if line 1 is replaced by Line 2 and Line 3 it works absolutely fine and displays the value of a:5 b:23 c:28

class ExplicitCast
{
	public static void main(String[] args)
	{
		byte a = 5, b=23;
//		byte c += a+b;  // Line 1 
		byte c = 0;     // Line 2
			c+= a + b;  // Line 3
			System.out.println("a: "+a+" b: "+b+" c: "+c);
	}
}

Doubt: If I have understood the concept, is the reason why line 1 doesn't work is because the variable c is not initialized in the main method. And not because the explicit cast is required.

Thanks

added code tags, please read UseCodeTags

[Henry Wong]

Kaur Manpreet wrote:Hi All,

In the following program if line 1 is uncommented the code throws a compile time error, whereas if line 1 is replaced by Line 2 and Line 3 it works absolutely fine and displays the value of a:5 b:23 c:28

class ExplicitCast
{
public static void main(String[] args)
{
byte a = 5, b=23;
// byte c += a+b; // Line 1
byte c = 0; // Line 2
c+= a + b; // Line 3
System.out.println("a: "+a+" b: "+b+" c: "+c);
}
}

Doubt: If I have understood the concept, is the reason why line 1 doesn't work is because the variable c is not initialized in the main method. And not because the explicit cast is required.

Thanks

It's defined in the specification that way. Declarations do not support compound statements for initialization.

Henry

[Kaur Manpreet]

Thanks Henry