Random
Save here: .../APCSA1/apcsa-assignments-YourUsername-fakk/classwork/12_05_random/random.txt
- Which of the following statements assigns a random integer between 1 and 10, inclusive, to rn ?
a. int rn = (int) (Math.random()) * 10;
b. int rn = (int) (Math.random()) * 10 + 1;
c. int rn = (int) (Math.random() * 10);
d. int rn = (int) (Math.random() * 10) + 1;
e. int rn = (int) (Math.random() + 1) * 10;
Answer:
- Consider the following code segment, which is intended to assign to num a random integer value between min and max, inclusive. Assume that min and max are integer variables and that the value of max is greater than the value of min.
double rn = Math.random();
int num = /* missing code */;
Which of the following could be used to replace /* missing code */ so that the code segment works as intended?
a. (int) (rn * max) + min
b. (int) (rn * max) + min - 1
c. (int) (rn * (max - min)) + min
d. (int) (rn * (max - min)) + 1
e. (int) (rn * (max - min + 1)) + min
Answer:
- Assume that myList is an ArrayList that has been correctly constructed and populated with objects. Which of the following expressions produces a valid random index for myList?
a. (int) ( Math.random () * myList.size () ) - 1
b. (int) ( Math.random () * myList.size () )
c. (int) ( Math.random () * myList.size () ) + 1
d. (int) ( Math.random () * (myList.size () + 1) )
e. Math.random (myList.size () )
Answer: