This was homework and the task was to state which variables were visible at the points in the code marked *a*, ..., *e* and what value each one had. Can someone tell me if my solutions were right?
public class Zustand {
public static void main(String[] args) {
final int DIV = 24;
int variable;
int counter = 1;
{
// *a*
variable = counter++;
int y = 12;
variable += y;
counter++;
// *b*
}
final double d;
{
counter = 4;
double a = 10.0;
{
d = a + ++counter;
// c
}
counter = 3;
while (counter > 0) {
counter--;
a -= counter;
// *d*
}
}
variable = variable / DIV;
// *e*
}
}
First what variables are there? My answer to this is:
final int DIVint variableint counterint yfinal double ddouble aThere are 6 variables for each *a*, ..., *e*. I will assign to the 6-tuple (DIV, variable, counter, y, d, a) another 6-tuple where the component of the tuple is either a number, the character w, or the symbol -. - means it is not visible. If it is a number it means that it is visible and the number is the value which is assigned to the variable. If it is the character w it means no value is assigned to the variable but it is visible.
So, this is my solution (is it right?). If something is wrong please give me a hint where my mistake could be.
*a* = (24,w,1,-,-,-)*b* = (24,14,2,12,-,-)*c* = (24,14,4,12,15,10.0)*d* = (24,14,0,12,15,4.0)*e* = (24,0,0,12,15,4.0)if you use System.out.println, it will help you solve it!
public static void main(String[] args) {
final int DIV = 24;
int variable;
int counter = 1;
{
// *a*
variable = counter++;
int y = 12;
variable += y;
counter++;
// *b*
System.out.println("y: " + y); // just an example
}
final double d;
{
counter = 4;
double a = 10.0;
{
d = a + ++counter;
// c
System.out.println("d: " + d); // just an example
}
counter = 3;
while (counter > 0) {
counter--;
a -= counter;
// *d*
System.out.println("a: " + a); // just an example
}
}
variable = variable / DIV;
// *e*
System.out.println("variable: " + variable); // just an example
System.out.println("DIV: " + DIV);
System.out.println("d: " + d);
System.out.println("counter : " + counter);
}
In your console, you will see something like this.
y: 12
d: 15.0
a: 8.0
a: 7.0
a: 7.0
variable: 0
DIV: 24
d: 15.0
counter : 0
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