CPP: Simple data type conversion

Convert string to int:

	#include <iostream>
	#include <string>
	int main()
	{
	std::string data("12345");
	int value = std::stoi(data);
	std::cout << "String 12345 converted to int : " << value << std::endl;
	return 0;
	}

view raw dataconv.cpp hosted with ❤ by GitHub

To build:

$: clang++ dataconv.cpp

Run it:

$: ./a.out

CPP: Basic usage of std::vector

Very basic usage of C++ STL std::vector

	#include<iostream>
	#include<vector>
	int main()
	{
	std::vector<int> vector_test {1,2,3,4,5};
	for(int i: vector_test){
	std::cout << i << std::endl;
	}
	return 0;
	}

view raw stdvector.cpp hosted with ❤ by GitHub

To build:

$: clang++ stdvector.cpp

Run it:

$: ./a.out

CPP: Basic usage of std::map

Very basic usage of C++ STL std::map

	#include<iostream>
	#include<map>
	int main()
	{
	std::map<char, int> map_test {{'a',1},{'b',2},{'c',3},{'d',4},{'e',5}};
	for(std::pair<char, int> element : map_test) {
	std::cout << element.first << ":" << element.second << std::endl;
	}
	return 0;
	}

view raw stdmap.cpp hosted with ❤ by GitHub

To build:

$: clang++ stdmap.cpp

Run it:

$: ./a.out

CPP: Using std::list

Very basic usage of C++ STL std::list

	#include<iostream>
	#include<list>
	int main()
	{
	std::list<int> int_list {1,2,3,4,5};
	for(int i: int_list)
	{
	std::cout << i << std::endl;
	}
	return 0;
	}

view raw stdlist.cpp hosted with ❤ by GitHub

To build:

$: clang++ stdlist.cpp

Run it:

$: ./a.out

VI Editor common operations

My commonly used vi shortcut keys:

Command	Action	Notes
Basic operations
:q	Quit VI	This will exit VI editor
:q!	Force quit	This will exit VI editor even if buffers are dirty
:w	Save current buffer	Save currently active buffer
:e <ENTER>	Reload current buffer from file
:e /path/to/file	Load /path/to/file to a buffer
General
:set nowrap	Don't wrap text
:set number	Show line number
:set nu	Show line number (short hand)
:set nonumber	Hide line number
:set nu!	Hide line number (short hand)
Text Operations
v	Start Visual Mode(for copying)
y	Yank/copy selected text
yy	Copy line
2y	Copy 2 lines from the cursor
p	Paste _after_ the current line
P	Paste _before_ the current line
x	Delete char under the cursor
dw	Delete the word under the cursor	This will also delete the space after it
3dw	Delete 3 words	This will also delete the space after it
dd	Delete line	Deletes the entire line
Navigation
0	Jump to beginning of line
$	Jump to end of line
w	(count)Move to beginning of the word
b	Move to the beginning of the word
e	Move to the end of the word (punctuation considered part of the word)
ge	Jump to previous word ending
gE	Jump to previous word ending, ignore punctuation
gg	Start of file
G	End of file
21G	Go to line 22
Search and Replace
/{string}{ENTER}	Search for string
:%s/foo/bar/g	Search for foo and replace with bar in the current buffer
Merging
Note** run vimdiff file1 file2
]c	Jump to the next difference
[c	Jump to the previous difference
do	Copy line diff from _right_ buffer to the _left_ buffer
dp	Copy line diff from _left_ buffer to the _right_ buffer
Buffer operations
:bd	Delete current buffer
:bnext	Move to next buffer
:bprevious	Move to previous buffer
:b <tab>	Tab select buffers
:ls	List buffers (or :buffers or :files)
:ls <CR> :bx	List buffers and then select buffer "x"
Multiple Windows
C-w C-w	Move cursor to another window (cycle). Useful with NerdTree

Tutorials
VIM Introduction and Tutorial (link)
VI Cheat Sheet (link)
VIM Tips (link)
Code Merging with VIM (link)
VIM Tips and Tricks (cs.oberline.edu)