Diving into C++

As I believe that knowing C++ will come in handy in the future I have taken upon myself to learn this hellspawn of a language.

In the first week I have learned the absolute bare minimum of any coding language.

The “Hello World!”

#include <iostream>
using namespace std;

int main() {
  cout << "Hello World!";
  return 0;
}

What I learned from this:

This will be painful to learn
Every code in C++ should start with #include <iostream>
- #include meaning go grab (file) and include it
- <iostream> – the file that contains input/output tools
using namespace std; – I want to use the standard library tools without typing the full name every time
- instead of
  std :: cout << “Hello”;
- shortens to
- cout << “Hello”;
semi colons are a must and will haunt me in the near future
to end a statement I should use
- return 0;
Other things:
- int – return type. main returns an integer to the operating system when the program finishes.
- main – a special reserved function name that the OS looks for to start the program
- () – the parameter list.
  - can include:
    - int argc
    - char*
    - argv[]
    - etc
- {} – where the code goes into

Other functions that was learned in the first week of C++

cout is pronounced as see out
cin is for user input
- cin >> x;
  - >> – for input
  - int x – to define x
  - ; – the damn semi colon
// can be used anywhere as long as it isn’t literally in the middle of the code (eg: cou//t), it is used for comments
Types of variables
- int – integers (whole numbers)
  - int number = 67;
  - cout << number;
    - output: 67
- double – floating point numbers (2.12 etc etc)
  - double decimalNumber = 6.7;
  - cout << decimalNumber;
    - output: 6.7
- char – single characters (lower and upper case)
  - char character = E;
  - cout character;
    - output: E
- string – text
  - string wholeText = Meme
  - cout << wholeText;
    - output: Meme
- bool – true or false
  - bool bullShit = true;
    - bullShit is true

Junhwan Lee