Questions from Dan and Green's Exams..

[Saniya Ansari]

OK This q was from Dan's exam..
I'm wondering as in a lot of questions.. we may need to use a char as int like in this q.. are we supposed to know what is the representation of 'a' as an int?? Am I missing something..
class Sienna {
static double a;
static float b;
static int c;
static char d;
public static void main(String[] args) {
a = b = c = d = 'a';
System.out.println(a+b+c+d == 4 * 'a');
}
}

What is the result of attempting to compile and run the above program?
a. Prints: true
b. Prints: false
c. Compiler error.
d. Run time error.
e. None of the above.
THIS question is from Green's mock exam.. The correct answer includes the choice 1, i chose only 2 and 4. the first one wont that give a compile error coz the assignment operator has least precedence this means that 1/3 evaluated first. the value will be a decimal which by default will be considered double and assigning double to float is a compile error!
Which of the following are legal statements?
1) float f=1/3;
2) int i=1/3;
3) float f=1.01;
4) double d=999d;

Comments appreciated!! Thanks

[Barry Gaunt]

In Marcus Green's question option 1): 1/3 gives an int result of 0. That gets converted to 0.0f when assigned to a float.
In Dan's question: char 'a' is in a numeric range which can be converted to int, float, double without losing or gaining any precision, the addition a+b+c+d will give an exact result too. 4 * 'a' will be performed resulting in an int that can be converted to an exact double. So I would say that a+b+c+d == 4 * 'a' results in true. I just had to know that a is in the range 0 to 2^16-1.
-Barry
[ October 20, 2002: Message edited by: Barry Gaunt ]
[ October 20, 2002: Message edited by: Barry Gaunt ]

[Dan Chisholm]

Saniya,
As usual, Barry is correct. The question was designed such that you don't need to know the numeric value of 'a'. You only need to know that the implicit type conversion is performed as the primitive char value is converted to an int, float and double.

[Barry Gaunt]

Only the 'easy' ones Dan.
I'm getting busted on the "Cattle Drive". I can only hope it gets better after Halloween...
-Barry