CS1: Lecture 15 – Logical Operators
Dear students, We’ve seen the arithmetic operators. We’ve seen the relational and equality operators. Today we meet the logical operators &&, ||, and !. These operators have boolean operands and yield boolean values; they are designed for gluing together simple predicates into compound ones. Before we look at them, let’s complete a little warmup exercise. […]
CS1: Lecture 14 – Relational Operators
Dear students, We have seen the Computer as Calculator, a lover of number crunching. We have seen the Computer as Chef, organizing its tasks into self-contained recipes. Now we see the Computer as Philosopher, seeking truth from our data. Truth is communicated in our programs through the boolean data type. Values of type boolean can […]
CS 145 Lab 5 – Logical Expressions
Welcome to lab 5! If you have checkpoints from the last lab to show your instructor or TA, do so immediately. No credit will be given if you have not already completed the work, nor will credit be given after the first 10 minutes of this lab. In this lab, we’ll explore the logical operators […]
CS1: Lecture 13 – Test-driven Development
Dear students, Is there anything like charAt for integers? For instance, given a number and an “index” representing the place, can we get back the digit at that place? Not exactly, but there’s nothing stopping us from writing our own method to accomplish this task! But before we do that, let me share with you […]
CS 148 Lab 5 – More Methods
Welcome to lab 5! If you have checkpoints from the last lab to show your instructor or TA, do so immediately. No credit will be given if you have not already completed the work, nor will credit be given after the first 10 minutes of this lab. Checkpoint 1 Person A types. You’ve seen Practice-It!, […]
CS1: Lecture 12 – Method Mechanics
Dear students, Just as writers write paragraphs, programmers write methods. Like a good paragraph, a method has a clear and narrow purpose. Just as paragraphs decompose a grand thesis into digestable points, methods decompose a large problem into manageable subproblems. Since so much of our time will be spent writing methods, it is paramount that […]
CS 145 Lab 4 – More Methods
Welcome to lab 4! If you have checkpoints from the last lab to show your instructor or TA, do so immediately. No credit will be given if you have not already completed the work, nor will credit be given after the first 10 minutes of this lab. Checkpoint 1 Person A types. You’ve seen Practice-It!, […]
CS1: Lecture 11 – More Methods
Dear students, We’ll spend today continuing our discussion of methods—because we need practice. Java is a language, one invented by someone else, and we need to both speak it and hear it regularly in order to acquire it. Let’s start with an exercise in hearing Java, but with some parts inaudible. Fill in the Blanks […]
CS 148 Lab 4 – Methods
Welcome to lab 4! If you have checkpoints from the last lab to show your instructor or TA, do so immediately. No credit will be given if you have not already completed the work, nor will credit be given after the first 10 minutes of this lab. Work with a partner that you have not […]
CS1: Lecture 10 – Abstraction
Dear students, When we discuss methods, there are really two areas of concern: the interface and the implementation. The interface is the method’s “shape,” detailing the method’s name, it number and type of parameters, and its return type. The implementation is the actual instruction that make the method fulfill its purpose. As consumers or callers […]