1. UMBC CMSC 104 – Section 01, Fall 2016
Exam 1 Review

2. Notes & Announcements Exam 1 Postponed!
Old Date: Next Tuesday, 10/18
New Date: Next Thursday, 10/20
Next Tuesday, the TA will hold a Q&A session during class time
Bring your questions about anything that might be on the exam

3. Hands-on Lab 2 Review

4. Hands-on Lab Results
Most of you got the sum and the product without any problem
Most of you were able to calculate the average, but often the decimals were truncated…
Some of you got the largest & smallest calculations
… but most of you did it the hard way

5. Calculating the Average
Works how you would expect, except…
A float multiplied or divided by a float is always a float
An integer multiplied or divided by a float is always a float
An integer multiplied or divided by an integer is always an integer
Even you’re storing the result in a float variable!

6. Dividing Integers & Floats

7. Output of Previous Slide
An Integer divided by an Integer: An Integer divided by a Float:

8. Finding the largest and smallest
Many ways to do this
Compare each number to the others
Gets kind of complicated
Potentially lots of nested ifs
We haven’t covered “complex” comparators like && yet
A loop
Also complicated
Just add another variable!

9. Finding the largest and smallest

10. Lab 2 I posted two more files to the sample directory
stats.c – My “answer” to lab 2, which was used to create the sample output
division.c – The division sample we went over when discussing averages
Any other questions on this?

11. Exam 1 Review

12. Overview If it’s in the slides, it’s fair game Broad Concepts
Generally, concepts more important than specifics
Broad Concepts
Machine Architecture (parts of a computer)
Data Storage Concepts
Number Systems (Hex, Binary, Decimal)
OS Concepts & Linux
Algorithms & Algorithm Concepts
C Basics (i.e. what we’ve covered so far)

13. Machine Architecture Content Creation vs Consumption
Computer components
CPU, GPU, ALU, etc
Speed & Storage measurements
MHz, GHz, etc
MB, GB, etc
Volatile vs Non-volatile
Serial vs Parallel

14. Data Storage Concepts
Bits & Bytes
Data Sizes (see table)

15. Number Systems Binary Hex Conversions Binary to Decimal
Decimal to Binary
Hex to Decimal
Decimal to Hex
Hex to Binary
Binary to Hex

16. OS Concepts & Linux What is an OS Ways to interact with an OS Linux
Files & Directories
Frequently used commands
See slides
Know how to traverse the directory structure, create and delete files, etc

17. Algorithms & Algorithm Concepts
Definition of an algorithm
Characteristics of an algorithm
Pseudocode Concepts

18. C Basics Stages of compilation A basic C program template
Hello world!
Preprocessor directives for symbolic constants
#define
Legal Variable Identifiers
Declaring variables
Variable types
int, float, char
Basic printf() and scanf() usage

19. Questions?