CS7 Exam 1 Practice Questions

Here are some good problems from the book (JBD) to try:

Ch1: p.11-12 (1, 3, 10), p 13 (7b)
Ch2: p. 48-49 (4, 5, 6, 7, 13, 19, 25), p.49-50 (4, 6, 7, 11)
Ch3: p. 86-87 (5, 6, 7, 9, 10), p.89 (4)

And here are a few more. Assume all programs compile correctly (any errors are unintentional) unless stated otherwise.

1. Determine the output:

class HelloWorld {
  public static void main (String[] args) {
     int a=0, b=1;
     System.out.println(a + " " + b);
     a += b*3;
     System.out.println(a + " " + b);
     --b;
     System.out.println(a + " " + b);
     System.out.println(a + " " + --b); 
  }
}

2. Determine the output

// assume a 3 is entered when prompted
import tio.*;
class HelloWorld {
  public static void main (String[] args) {
     String greeting = "Hello";
     int num;

     System.out.println(greeting + " Please enter a number: ");
     num = Console.in.readInt();
     if (num < 5)
        System.out.print("That is just fine... ");
     else
        System.out.print("That is a great number... ");
        System.out.println("for me to poop on!");
  }
}

3. Write java declarations for the following:

an integer named "girth" initialized to -1.
an unitialized String intended to hold someone's middle name.
three doubles named x1, x2, and y1 initialized to 0.5, 10.5, and 100.5 respectively.

4. Write a java program that reads in two integers and prints their product, sum, and average.

5. Write a program that reads a single integer then prints "YES" if the number is even and divisible by 4, and a "NO" otherwise.