C++ Coding and Compiling

Why QT/C++ Over Java?






Java is easier than C++
Java has built in GUIs
Java is multi-platform
C/C++ is more used in industry
QT adds GUIs to C++
QT adds multi-platform IO to C++

C++ is like C


Comments are the same

// or /* */
Still need to include header files

#include

C++ is a little different


Declaring variables have 3 flavors
 type-expr variableName;

 type-expr variableName = value; type-expr variableName (value);
Namespaces

Like a group of header files. By listing the namespace, you include all of the files.

Inputs and Outputs



 cin -Standard Input (Keyboard) cout -Standard Output (Text) cerr -Standard Error Output (Text)
These are all examples of 'streams'
Streams are a key way that C++ thinks of inputs and outputs. They are also Objects!

What is an Object?




An object is like a structure
An object has things that can be done only to that object
An object has attributes that apply only to it
Example: A car is an object

Lets look at some code

Compiling C++

 g++ file.cpp
 produces 'a.out' or 'a.exe'
Makefiles can also be used (common)