1. Functions and More

2. Homework 1 Due September 11 @ 11:59pm return a string count characters in a string call functions in a function

3. git Version control Might cover this in more detail later in the semester For now – git clone https://hartloff@bitbucket.org/hartloff/cse250- fall2015.git If SSH keys are needed (timberlake) – upload private key upload – git clone git@bitbucket.org:hartloff/cse250- fall2015.git

4. clone alternative Download files from the BitBucket web interface – Might get you through this course – Not ideal If you want to write software, you will need to learn version control at some point

5. ftp (file transfer protocol) To move files across machines If you want to develop locally – Use this to move your files to timberlake – submit_cse250 hw1.cpp Need ftp software – FileZilla FileZilla – sftp://timberlake.cse.buffalo.edu – Port 22

6. On to C++

7. Functions in C++ Function declaration – float foo(int); – C++ functions must be declared before they are called Function definition – float foo(int i){return i*1.5;} – can be defined later Put all declarations at the beginning of your file Header file – Go one step further and put declarations in a separate file – #include “stringFunctions.h”

8. Makefile Useful when a project contains multiple files A way to compile all necessary files with one command – make Blank space matters in Makefiles All Makefiles will be provided for you in this class

9. References & An alias (nickname) to a variable – int k = 3; – int& p = k; – p = 6; After executing these 3 lines – k == 6 – Both k and p refer to the same location in memory Why not assign 6 to k directly? – When you have access to p, but not k

10. back to functions void square(int i){i = i*i;} int r = 5; square(r); r == 5 When square is called int i = r; i = i*i;

11. back to functions & void square(int& i){i = i*i;} int r = 5; square(r); r == 25 When square is called int& i = r; i = i*i; Use references when a function should alter a parameter Caution: Be aware if a function takes a reference or not