Pre-class Assignment

Please read through and complete the participation exercises under the C++ for lab 1 (and more) section of the zyBook. You can skip “Try 3.3.1 that requires you to download RIMS for windows. Also finish up lab 0 if you haven’t completed it.

Announcements

• Lab 0 should be completed by today
• Lab 1 is out and will be due in two weeks
  • Lab hours Wednesday 1:15pm–4pm in Singer 221
• Office hours: by appointment (email me if none of those times work)

Learning Objectives and Outcomes

In this lecture you will:

• listen to a short lecture reviewing how to use RIMS and introducing lab 1
• complete an in class exercise on how pointers work in C/C++
• listen to a short lecture introducing how to use pointers for lab 1

By the end of this lecture you should be able to:

• complete the first half of lab 1 (Exercises 0 – 3)

Lecture Content

• RIMS review
  • Built into browser; great for practicing some basics like bitwise manipulation (which you’ll do for lecture 4)
  • Also has a desktop app but Windows only (won’t be required for course but you can use it if you want)
• Lab 1 Overview: Lab 1: Four Function Calculator with Keypad
• Pointers overview

  • Pointers are special types that store the address of another variable, rather than the value of a variable

    • if I have an integer number located at memory address 0, and I created a pointer to that location, I would have a pointer with value 0.

  • Pointers used in lab 1 in two scenarios

    • When we need multiple outputs from a function
      • int getNumber(int number, bool keyPad, char* operation, bool* negative);
    • When using reading/writing characters from the serial terminal
      • pc.read(&buff,1);
    • Pointers further reading
      • operators
        • & is the address-of operator, and can be read simply as "address of"
        • * is the dereference operator, and can be read as "value pointed to by"

  • declaring a pointer (* just means pointer, not dereference)

    int * number;
    char * character;
    double * decimals;
    

In Class Exercises

Write a function that adds two integers and stores the result in an int passed to the function as a pointer: void addTwoNumbers(int num1, int num2, int * result);