Tutorial by Examples: ti

Pointer addition Given a pointer and a scalar type N, evaluates into a pointer to the Nth element of the pointed-to type that directly succeeds the pointed-to object in memory. int arr[] = {1, 2, 3, 4, 5}; printf("*(arr + 3) = %i\n", *(arr + 3)); /* Outputs "4", arr's fourth e...

The first operand must be a function pointer (a function designator is also acceptable because it will be converted to a pointer to the function), identifying the function to call, and all other operands, if any, are collectively known as the function call's arguments. Evaluates into the return valu...

In this example we are going to plot multiple lines onto a single axis. Additionally, we choose a different appearance for the lines and create a legend. % create sample data x = linspace(-2,2,100); % 100 linearly spaced points from -2 to 2 y1 = x.^2; y2 = 2*x.^2; y3 = 4*x.^2; ...

Creating an empty table is as simple as this: local empty_table = {} You can also create a table in the form of a simple array: local numeric_table = { "Eve", "Jim", "Peter" } -- numeric_table[1] is automatically "Eve", numeric_table[2] is "Ji...

Normally, a Docker container persists after it has exited. This allows you to run the container again, inspect its filesystem, and so on. However, sometimes you want to run a container and delete it immediately after it exits. For example to execute a command or show a file from the filesystem. Dock...

git add -i (or --interactive) will give you an interactive interface where you can edit the index, to prepare what you want to have in the next commit. You can add and remove changes to whole files, add untracked files and remove files from being tracked, but also select subsection of changes to put...

There are several ways to set which editor to use for committing, rebasing, etc. Change the core.editor configuration setting. $ git config --global core.editor nano Set the GIT_EDITOR environment variable. For one command: $ GIT_EDITOR=nano git commit Or for all commands run in a ...

std::map and std::multimap both can be initialized by providing key-value pairs separated by comma. Key-value pairs could be provided by either {key, value} or can be explicitly created by std::make_pair(key, value). As std::map does not allow duplicate keys and comma operator performs right to left...

Removing all elements: std::multimap< int , int > mmp{ {1, 2}, {3, 4}, {6, 5}, {8, 9}, {3, 4}, {6, 7} }; mmp.clear(); //empty multimap Removing element from somewhere with the help of iterator: std::multimap< int , int > mmp{ {1, 2}, {3, 4}, {6, 5}, {8, 9}, {3, 4}, {6, 7} }; ...

An element can be inserted into a std::map only if its key is not already present in the map. Given for example: std::map< std::string, size_t > fruits_count; A key-value pair is inserted into a std::map through the insert() member function. It requires a pair as an argument: fruits_c...

std::map or std::multimap could be traversed by the following ways: std::multimap< int , int > mmp{ {1, 2}, {3, 4}, {6, 5}, {8, 9}, {3, 4}, {6, 7} }; //Range based loop - since C++11 for(const auto &x: mmp) std::cout<< x.first <<":...

There are several ways to search a key in std::map or in std::multimap. To get the iterator of the first occurrence of a key, the find() function can be used. It returns end() if the key does not exist. std::multimap< int , int > mmp{ {1, 2}, {3, 4}, {6, 5}, {8, 9}, {3, 4}, {6, 7} }; ...

SELECT DisplayName, JoinDate, Reputation FROM Users ORDER BY JoinDate, Reputation DisplayNameJoinDateReputationCommunity2008-09-151Jeff Atwood2008-09-1625784Joel Spolsky2008-09-1637628Jarrod Dixon2008-10-0311739Geoff Dalgas2008-10-0312567

Each individual CSS Selector has its own specificity value. Every selector in a sequence increases the sequence's overall specificity. Selectors fall into one of three different specificity groups: A, B and c. When multiple selector sequences select a given element, the browser uses the styles appli...

Node.js package configurations are contained in a file called package.json that you can find at the root of each project. You can setup a brand new configuration file by calling: npm init That will try to read the current working directory for Git repository information (if it exists) and enviro...

The Lua standard library provides a pairs function which iterates over the keys and values of a table. When iterating with pairs there is no specified order for traversal, even if the keys of the table are numeric. for key, value in pairs(input_table) do print(key, " -- ", value) en...

HTML input validation is done automatically by the browser based on special attributes on the input element. It could partially or completely replace JavaScript input validation. This kind of validation can be circumvented by the user via specially crafted HTTP requests, so it does not replace serve...

Usually, Lua is being shipped with two binaries: lua - standalone interpreter and interactive shell luac - bytecode compiler Lets say we have an example program (bottles_of_mate.lua) like this: local string = require "string" function bottle_take(bottles_available) lo...

The first two arguments to format are an output stream and a control string. Basic use does not require additional arguments. Passing t as the stream writes to *standard-output*. > (format t "Basic Message") Basic Message nil That expression will write Basic Message to standard ou...

main = do input <- getContents putStr input Input: This is an example sentence. And this one is, too! Output: This is an example sentence. And this one is, too! Note: This program will actually print parts of the output before all of the input has been fully read in. This m...