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typecasting problem

 
Ranch Hand
Posts: 145
Oracle Java Linux
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class TypeCast1{
public static void main(String args[]){
short s1=25;
short s2=12;
short s3=s1+s2;

short s4=s1+9;

System.out.println(s3);
System.out.println(s4);
}
}
This code gives me compile time error, but if I change all short to int, it compiles perfectly fine. Why?
 
Ranch Hand
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Your code gives compiler error as it should be, because when you try to add short and literal 9, 9 is by default taken as int and adding int + short results in int which you are trying to assign to short variable. Hence you are getting compile time error.
 
Greenhorn
Posts: 27
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Yes anuj is correct, in addition i would like to add that even if you try to add short to short it give you an int.

So s3=s1+s2; will also give an error
 
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by default all arithmetic operations involving all numeric types less than int (byte, short, char )will be promoted to int value by the compiler.


so if the destination type is not an int we need to type cast it.
hope I have cleared your doubt
 
Ranch Hand
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Originally posted by vijaya saradhi:
by default all arithmetic operations involving all numeric types less than int (byte, short, char )will be promoted to int value by the compiler.


so if the destination type is not an int we need to type cast it.
hope I have cleared your doubt



This is also true for unary operators like +,-
 
Nancy Antony
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Thanks
 
Greenhorn
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short s3 = s1 + s2;

1) first s1 is evaluated as a int type variable and also s2.

2) total s1+s2 is evaluated as int type.

3) so we should type cast to short or take RHS variable of type as int.

Plese check ..urgently..now itself ..scjp by Khlid mugal.
 
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