CLASS - X (ICSE)
COMPUTER APPLICATION
Type Conversion
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When
different types of variables and constants are mixed up in an expression, they
are converted in one common type implicitly by the compiler. This is called
type conversion.
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Java
facilitates the type conversion in two forms:
Implicit
type conversion:-
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An
implicit type conversion is a conversion performed by the compiler without
programmer’s intervention.
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The
java compiler converts all operands upto the data type of the largest data
type’s operand, which is called type
promotion.
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Example:
int a=10;
float f=a;
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Program
class ExampleOfImplicit{
public static void main(String args[]){
int a=10;
float f=a;
System.out.println(a);
System.out.println(f);
}
}
Output:
10
10.0
Explicit
type conversion :-
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An
explicit type conversion is user-defined that forces an expression to be of
specific data type.
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It
is also known as type casting.
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Example:float
x=3.4f;
int
y=(int)x;
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Program
class ExampleOfExplicit{
public static void main(String args[]){
float f=10.5f;
int a=(int)f;
//int
a=f; (compile time error)
System.out.println(f);
System.out.println(a);
}
}
Output:
10.5
10
®
If
you will do typecast then it means you are doing forcefully as you can see int
y=(int)x; here data is lost but no error.
®
Always
remember you can do typecast but java usually don’t allow it by itself.
Conversions that compiler do itself (implicit conversions)
byte to short, int, long, float or double
short to int, long, float or double
char to int, long, float or double
int to long, float or double
long to float or double
float to double
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