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#include <stdio.h> #include <string.h> int main(void) { /* Always ensure that your string is large enough to contain the characters * and a terminating NUL character ('\0')! */ char mystring[10]; /* Copy "foo" into `mystring`, until a NUL character is en...

The strcase*-functions are not Standard C, but a POSIX extension. The strcmp function lexicographically compare two null-terminated character arrays. The functions return a negative value if the first argument appears before the second in lexicographical order, zero if they compare equal, or positi...

int* foo(int bar) { int baz = 6; baz += bar; return &baz; /* (&baz) copied to new memory location outside of foo. */ } /* (1) The lifetime of baz and bar end here as they have automatic storage * duration (local variables), thus the returned pointer is not valid! */ ...

Starting with a given list a: a = [1, 2, 3, 4, 5] append(value) – appends a new element to the end of the list. # Append values 6, 7, and 7 to the list a.append(6) a.append(7) a.append(7) # a: [1, 2, 3, 4, 5, 6, 7, 7] # Append another list b = [8, 9] a.append(b) # a: [1, 2, 3, 4, ...

Use len() to get the one-dimensional length of a list. len(['one', 'two']) # returns 2 len(['one', [2, 3], 'four']) # returns 3, not 4 len() also works on strings, dictionaries, and other data structures similar to lists. Note that len() is a built-in function, not a method of a list objec...

int x = 0; int y = 5 / x; /* integer division */ or double x = 0.0; double y = 5.0 / x; /* floating point division */ or int x = 0; int y = 5 % x; /* modulo operation */ For the second line in each example, where the value of the second operand (x) is zero, the behaviour is undefine...

Let's say we have two classes, Cat and Dog. class Cat def eat die unless has_food? self.food_amount -= 1 self.hungry = false end def sound puts "Meow" end end class Dog def eat die unless has_food? self.food_amount -= 1 self.hungry = f...

Let's say you want to generate counts or subtotals for a given value in a column. Given this table, "Westerosians": NameGreatHouseAllegienceAryaStarkCerceiLannisterMyrcellaLannisterYaraGreyjoyCatelynStarkSansaStark Without GROUP BY, COUNT will simply return a total number of rows: SELE...

/* define a list of preprocessor tokens on which to call X */ #define X_123 X(1) X(2) X(3) /* define X to use */ #define X(val) printf("X(%d) made this print\n", val); X_123 #undef X /* good practice to undef X to facilitate reuse later on */ This example will result in the prep...

Due to auto unboxing, one can use a Boolean in an if statement: Boolean a = Boolean.TRUE; if (a) { // a gets converted to boolean System.out.println("It works!"); } That works for while, do while and the condition in the for statements as well. Note that, if the Boolean is null...

Basics The Reflection API allows one to check the class structure of the code at runtime and invoke code dynamically. This is very powerful, but it is also dangerous since the compiler is not able to statically determine whether dynamic invocations are valid. A simple example would be to get the p...

Syntax for accessing rows and columns: [, [[, and $ This topic covers the most common syntax to access specific rows and columns of a data frame. These are Like a matrix with single brackets data[rows, columns] Using row and column numbers Using column (and row) names Like a list: Wi...

To use an accordion, one must have headers and content inside the headers in their HTML. Then one must instantiate the accordion() method of jQuery UI. <script> $(function() { $( "#accordion" ).accordion(); }); </script> In the HTML: <div id="accordion&quot...

$( "#accordion" ).accordion( "destroy" ); This will remove the accordion functionality completely and show default HTML removing all the jQuery-UI elements. This method does not take any arguments.

$( "#accordion" ).accordion( "disable" ); This method will disable the accordion, i.e. the headers are not selectable making the content read only and static. This method does not take any arguments.

$( "#accordion" ).accordion( "enable" ); This method will enable an accordion. This will enable a disabled accordion or simply do nothing on an already enabled accordion. This method does not take any arguments.

var options = $( "#accordion" ).accordion( "option" ); This will return a PlainObject giving all the options representing the selected accordion. This will contain all the values of the keys that are explained in the Parameters section. This method takes parameters which are ...

$( "#accordion" ).accordion( "refresh" ); This method recomputes the height of the accordion panels if headers or content was added or removed in the DOM.

var widget = $( "#accordion" ).accordion( "widget" ); This method returns a jQuery object containing the accordion.

var array = [3, 2, 1] Creating a new sorted array As Array conforms to SequenceType, we can generate a new array of the sorted elements using a built in sort method. 2.12.2 In Swift 2, this is done with the sort() method. let sorted = array.sort() // [1, 2, 3] 3.0 As of Swift 3, it has...