1. EECs 183 Discussion 10
Hannah Westra

2. Upcoming Due Dates Final Projects Project 4 Due Today
Exam 2 Wednesday, November 16th
Review Session Sunday, November 13th
Lectures 1-18 with emphasis on 12-18
1D arrays, 2D arrays, filestreams, classes, testing
Do NOT go by exam number - some semesters have 3 exams, and the 2-exam semesters also include python so go by topic, not exam!
Final Projects
Specs are out!
Questions?

3. datatype name[CONST_SIZE]; datatype name[CONST_SIZE][CONST_SIZE];
Arrays
datatype name[CONST_SIZE]; datatype name[CONST_SIZE][CONST_SIZE];
[0][0]
[0][1]
[0][2]
[1][0]
[1][1]
[1][2]
[2][0]
[2][1]
[2][2]
ALWAYS: arr[row][col]

4. Exam Review: Array Declaration and Initialization
int my_array[5];
int my_array[] = {1, 2, 3, 4, 5}; //size of 5
int my_array[5] = {1, 2, 3, 4, 5};
int my_array[8] = {1, 2, 3, 4, 5}; //compiler will insert 0’s after 5th elt
ALL VALID

5. Iterating Through 1D Arrays
int array4[14] = 0;
int size4 = 9;
for (int i = 0; i < size4; i++) {
cout << array4[i]; }

6. Passing into Functions
void foo(int size, string arr[]); // declaration
int main () {
string array[2] = {“First Name”, “Last Name”};
foo(2, array); }
// foo implementation somewhere down here

7. Initializing Directly
With a 2-dimensional array, the compiler absolutely needs to know the column (the second parameter) size at compile time
The row is optional
const int HEIGHT = 3;
const int WIDTH = 4;
int board[HEIGHT][WIDTH] = {
{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10 , 11, 12} };
You can also initialize all to the same thing, using nested loops

8. Filestreams

9. >_chrysanthemum Input stream USER INPUTS “chrysanthemum”
output stream
>_chrysanthemum
PROGRAM INPUTS “chrysanthemum”

12. Check the state of the stream
if (input_file.good()){…} // check if the stream is good ~or~ if (input_file.fail()){…} // check if the state is bad (fail bit is 1) if (!input_file.good()){...} // check if the state is bad (fail bit is 1) if (input_file){…} // check if the state is good (fail bit is 0) if (!input_file){...} // check if the state is bad (fail bit is 1)
What happens when you do input_file.clear()??

13. Classes

14. Classes
What is a class?
A class is a container that can hold different types of objects (objects with different data types)
A class is a user-defined data type
Just like int and double and string are data types, so is the class you define
A class is a way to group together related information
Private by default

15. Parts of a Class Constructors Setters Getters Relevant functions
Default and non-default
Setters
Getters
Relevant functions
Member variables

16. Questions?

19. More Questions to Practice
1D Arrays: Fall 2012, Exam 2, Free Response, #1
2D Arrays: Winter 2015, Exam 2, Free Response, #1
File I/O: Winter 2014, Exam 3, Free Response, #2
Classes: Fall 2013, Exam 3, Free Response #4

20. Upcoming Due Dates Final Projects Project 4 Due Today
Exam 2 Wednesday, November 16th
Review Session Sunday, November 13th
Lectures 1-18 with emphasis on 12-18
1D arrays, 2D arrays, filestreams, classes, testing
Do NOT go by exam number - some semesters have 3 exams, and the 2-exam semesters also include python so go by topic, not exam!
Final Projects
Specs are out!
Questions?