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In-class activities

Problem 1

Write a function countdown() that takes a number and prints:

N
N-1
N-2
...
1
Liftoff!

where N is the number you give it.

Example:

countdown(3);
3
2
1
Liftoff!

One possible answer:

void countdown(int n) {
    for (int i = n; i > 0; i--) {
        printf("%s\n", i);
    }
    printf("Liftoff!");
}

|  Added method countdown(int)

countdown(10)

10
9
8
7
6
5
4
3
2
1
Liftoff!

countdown(3)

3
2
1
Liftoff!

Problem 2

Write a function volume() that takes an height, width, and length dimensions and returns the volume of a cube with those dimensions.

One possible answer:

double volume(double width, double height, double length) {
    return (width * height * length);
}

|  Added method volume(double,double,double)

volume(3, 4, 6)

|  Expression value is: 72.0
|    assigned to temporary variable $5 of type double

72.0

Problem 3

Define a class to hold students. The constructor should take a name and a year of graduation. Add a method "status" that when called, says: "You are a junior" (or whatever). Assume that the year is 2016.

Student student1 = new Student("Milley Cyrus", 2018); Student student2 = new Student("Taylor Swift", 2012);

The status is one of:

• not in college yet
• firstyear
• sophomore
• junior
• senior
• graduated

The beginning of a solution:

class Student {
    String name;
    int year;
    Student(String name, int year) {
        this.name = name;
        this.year = year;
    }
    void status() {
        printf("You are crazy!");
    }
}

|  Added class Student

Student miley = new Student("Miley Cyrus", 2015);

|  Added variable miley of type Student with initial value Student@50675690

miley.status()

You are crazy!