Blog

A graduate-level statistics class surveyed 120 students on their knowledge of three software tools: R, Python, and MATLAB. 65 students know R 75 students know Python 50 students know MATLAB 30 students know both R and Python 25 students know both R and MATLAB 35 students know both Python and MATLAB 15 students know all three languages Show your work on the scratch paper when answering Q1-Q3.

What is the advantage of the code on the top compared to the one on the bottom. (Note: BalanceException is a checked exception)   int withdraw(int amount) {   if (amount > balance)       return -1;   else {       balance -= amount;        return 0;   } }   void withdraw(int amount) throws BalanceException{  if (amount > balance){        throw new BalanceException();   }   balance -= amount; }  

Why is deep inheritance problematic?

Does this code compile? Does it produce a compilation warning? Does it produce a runtime error? Explain the behavior and the reason behind it.   public static void func(Number arr[]){       arr[0] = 5.0;      } public static void main(String [] args) {     Integer arr[] = new Integer[100];     func(arr); }

Following Type Eraser, how does the code below look like?                  Before: class GeometricObject {  public double getArea() {return 1.0;}  } public static boolean  equalArea(E object1, E object2)  {     return object1.getArea() ==  object2.getArea(); }                  After: ?

Given two objects a and b such that a.equals(b) is true. Should a.hashCode() and b.hashCode() be also equal? Justify your answer. Yes No Justification:

Given the class hierarchy below. Could the symmetry of equals() be violated? If yes, provide client code that demonstrates that.   class A {   int x;   public A(int x) {this.x = x;}   public boolean equals(Object o) {        if (!(o instanceof A)) return false;        A a = (A)o;        return this.x == a.x;   }        } class B extends A {   int y;   public B(int x, int y) {super(x); this.y = y;} }  

What is the process used to divide polynomials, similar to dividing numbers?

What is the graph of any quadratic function called?

Barry’s Sport Shop calls Champs Tee Shirt Company to order 200 designer tee shirts at $2 per shirt. The next day, Barry decides he can easily sell 100 more. Before the order is filled, he calls to change the order to 300 tee shirts. Champs sends 200. Can Barry force Champs to send the additional 100?