https://code-reference.com/ 2026-05-19T01:05:49+02:00 https://code-reference.com/ https://code-reference.com/ttps://code-reference.com/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-02-16T01:04:19+02:00 https://code-reference.com/arduino/boolean_operators/boolean?rev=1708041859&do=diff !Boolean Operators These can be used inside the condition of an if (conditional) and ==, !=, <, > (comparison operators) statement. && (logical and) True only if both operands are true, e.g. if (digitalRead(2) == HIGH && digitalRead(3) == HIGH) { // read two switches // ... } text/html 2013-02-15T20:49:14+02:00 https://code-reference.com/arduino/constants/constants?rev=1360957754&do=diff Constants are predefined variables in the Arduino language. They are used to make the programs easier to read. We classify constants in groups. Defining Logical Levels, true and false (Boolean Constants) There are two constants used to represent truth and falsity in the Arduino language: true, and false. text/html 2024-02-16T01:04:08+02:00 https://code-reference.com/arduino/control_structures/if?rev=1708041848&do=diff if, which is used in conjunction with a comparison operator, tests whether a certain condition has been reached, such as an input being above a certain number. The format for an if test is: if (someVariable > 50) { // do something here } The program tests to see if someVariable is greater than 50. If it is, the program takes a particular action. Put another way, if the statement in parentheses is true, the statements inside the brackets are run. If not, the program skips over the code. text/html 2024-02-16T01:12:06+02:00 https://code-reference.com/lua/codea/stargenerator/star.lua?rev=1708042326&do=diff Star = class() function Star:init(init) -- you can accept and set parameters here self.mx = 500 self.my = 400 if init == true then self.x = math.random(self.mx-10,self.mx+10) self.y = math.random(self.my-10,self.my+10) self.size = math.random(1,3) else self.x = math.random(1,1200) self.y = math.random(1,1200) self.size = math.random(1,6) end self.xspeed = math.random(1,10) self.yspeed = math.random(1,10) se… text/html 2024-02-16T01:04:32+02:00 https://code-reference.com/cpp/control_structures/if?rev=1708041872&do=diff if The 'if' statement is one of many methods to control the flow of a program. It tests whether or not a certain condition is true, and then executes code based on the test. #include <iostream> using namespace std; int main(){ if (TRUE){ cout << "This statement will be executed"; } if (FALSE){ cout << "This one will not"; } return 0; } text/html 2024-02-16T01:04:08+02:00 https://code-reference.com/arduino/control_structures/else?rev=1708041848&do=diff if/else allows greater control over the flow of code than the basic if statement, by allowing multiple tests to be grouped together. For example, an analog input could be tested and one action taken if the input was less than 500, and another action taken if the input was 500 or greater. The code would look like this: text/html 2024-02-16T01:05:48+02:00 https://code-reference.com/c/graphics.h/initwindow?rev=1708041948&do=diff initwindow Syntax of initwindow #include "graphics.h" int initwindow(int width, int height, const char* title="Windows BGI", int left=0, int top=0, bool dbflag=false, closeflag=true); Description of initwindow The initwindow function is available in the winbgim implementation of BGI graphics. You do not need to include conio.h; just include graphics.h. The function initializes the graphics system by opening a graphics window of the specified size. The first two parameters (width and hei… text/html 2024-02-16T01:05:51+02:00 https://code-reference.com/c/graphics.h/mousey?rev=1708041951&do=diff mousey Syntax of mousey #include "graphics.h" int mousey(void); Description of mousey The mousey function is available in the winbgim implementation of BGI graphics. It returns the most recent y coordinate of the mouse within the graphics window. Y-coordinates start with 0 at the top edge of the window and increase to getmaxy( ) at the bottom edge of the window. text/html 2017-07-31T22:37:05+02:00 https://code-reference.com/wiki/syntax?rev=1501533425&do=diff DokuWiki supports some simple markup language, which tries to make the datafiles to be as readable as possible. This page contains all possible syntax you may use when editing the pages. Simply have a look at the source of this page by pressing the Edit this page button at the top or bottom of the page. If you want to try something, just use the playground page. The simpler markup is easily accessible via quickbuttons, too. text/html 2015-12-10T13:35:50+02:00 https://code-reference.com/bash/quick_reference?rev=1449750950&do=diff Bash quick reference Command Description Example & Run the previous command in the background ls & && Logical AND if [ “$foo” -ge “0” ] && [ “$foo” -le “9”] || Logical OR if [ “$foo” -lt “0” ] || [ “$foo” -gt “9” ] (not in Bourne shell) ^ Start of line grep ”^foo” $ End of line grep “foo$” = String equality (cf. -eq) if [ “$foo” = “bar” ] ! Logical NOT if [ “$foo” != “bar” ] $$ PID of current shell echo “my PID = $$” $! PID of last background command ls & echo “PID of ls = $!” $? exit status… text/html 2024-02-16T01:06:16+02:00 https://code-reference.com/objective-c/control_structures/while?rev=1708041976&do=diff syntax while (condition is true/untrue) { statement; } or while ( condition == true ) { do something until condition untrue } while example objective c NSInteger i=0; while (i < 42) { i++; if (i==42) NSLog(@"whoooha "); } text/html 2024-02-16T01:05:56+02:00 https://code-reference.com/c/graphics.h/registermousehandler?rev=1708041956&do=diff registermousehandler Example of registermousehandler /* mouse example */ #include "graphics.h" // The click_handler will be called whenever the left mouse button is // clicked. It checks copies the x,y coordinates of the click to // see if the click was on a red pixel. If so, then the boolean // variable red_clicked is set to true. Note that in general // all handlers should be quick. If they need to do more than a little // work, they should set a variable that will trigger the work going, … text/html 2024-02-16T01:05:52+02:00 https://code-reference.com/c/graphics.h/mousex?rev=1708041952&do=diff mousex Syntax of mousex #include "graphics.h" int mousex(void); Description of mousex The mousex function is available in the winbgim implementation of BGI graphics. It returns the most recent x coordinate of the mouse within the graphics window. X-coordinates start with 0 at the left edge of the window and increase to getmaxx( ) at the right edge of the window. text/html 2024-02-16T01:05:56+02:00 https://code-reference.com/c/graphics.h/setmousequeuestatus?rev=1708041956&do=diff setmousequeuestatus Syntax of setmousequeuestatus #include "graphics.h" voud setmousequeuestatus(int kind, bool status=true); Description of setmousequeuestatus The setmousequeuestatus function is available in the winbgim implementation of BGI graphics. This function controls whether mouse events of a particular kind are queued for processing. If the status parameter is false, then mouse events of the specified kind are not queued. This means that each time a mouse event of that kind oc… text/html 2013-04-10T10:35:55+02:00 https://code-reference.com/java/control_structures/if?rev=1365582955&do=diff if ( condition == true ){ command; } check if a condition is true or false example of if in java package plausibilitycheck; import java.util.Scanner; public class Plausibilitycheck{ /** * @param args the command line arguments */ public static void main(String[] args) { int celsius; double fahrenheit; Scanner scan = new Scanner(System.in); System.out.print("Please type in Celsius : "); celsius = scan.nextInt(); … text/html 2024-02-16T01:03:58+02:00 https://code-reference.com/java/control_structures/else?rev=1708041838&do=diff if ( condition == true ){ command; } else { // if the "if" condition false command; } check if a condition is true or false example of else package plausibilitycheck; import java.util.Scanner; public class Plausibilitycheck{ /** * @param args the command line arguments */ public static void main(String[] args) { int celsius; double fahrenheit; Scanner scan = new Scanner(System.in); System.out.print("Please … text/html 2024-02-16T01:04:45+02:00 https://code-reference.com/c/control_structures/else?rev=1708041885&do=diff else #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ if ( condition == true ){ command; } else { command; } C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ int main( void ) { int i; for (i=0;i<=99;i++){ if (i==42) { printf("I have found the answer: %i\n",i); } else { printf("found any other… text/html 2024-02-16T01:05:48+02:00 https://code-reference.com/c/graphics.h/kbhit?rev=1708041948&do=diff kbhit Syntax of kbhit #include "graphics.h" int kbhit(void); Description of kbhit The kbhit function is available in the winbgim implementation of BGI graphics. You do not need to include conio.h; just include graphics.h. The function returns true (non-zero) if there is a character in the input buffer ready to read. Otherwise it returns false. In order to work, the user must click in the graphics window (i.e., the Windows focus must be in the graphics window). text/html 2018-01-12T07:29:06+02:00 https://code-reference.com/java/datatypes?rev=1515738546&do=diff package datatypes; public class DataTypes { public static void main(String[] args) { // primitiv Datatypes boolean aa = true; // 1 bit char bb = 'A'; // 2 Bytes char cc = 65; // 2 Bytes byte dd = 12; // 1 Byte -128 - +127 short ee = 234; // 2 Bytes -32768 - +32767 int ff = 4711; // 4 Bytes long gg = 34567; // 8 Bytes float hh = 3.14f; // 4 Bytes d… text/html 2024-02-16T01:05:49+02:00 https://code-reference.com/c/graphics.h/ismouseclick?rev=1708041949&do=diff ismouseclick Syntax of ismouseclick #include "graphics.h" bool ismouseclick(int kind); Description of ismouseclick The ismouseclick function is available in the winbgim implementation of BGI graphics. This function returns true if there is an unprocessed mouse event of the specified kind. The argument to ismouseclick is one of these constants from the graphics.h file: WM_MOUSEMOVE if you want to detect a mouse movement WM_LBUTTONDBLCLK ...detect when the left mouse button is double … text/html 2024-02-16T01:12:02+02:00 https://code-reference.com/java/io/printstream/close?rev=1708042322&do=diff Close and flush the print stream. close(); return value: if IO error true otherwise false Language Example no example jet output output for example text/html 2013-02-16T13:55:59+02:00 https://code-reference.com/c/control_structures/while?rev=1361019359&do=diff while #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ while ( condition == true ) { do something until condition untrue } C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ int main(void) { int i=0; while (i <= 10) { printf("%i\n",i); i++; } return 0; } text/html 2024-02-16T01:04:08+02:00 https://code-reference.com/arduino/control_structures/while?rev=1708041848&do=diff Description while loops will loop continuously, and infinitely, until the expression inside the parenthesis, () becomes false. Something must change the tested variable, or the while loop will never exit. This could be in your code, such as an incremented variable, or an external condition, such as testing a sensor. text/html 2024-02-16T01:12:01+02:00 https://code-reference.com/java/io/printstream/checkerror?rev=1708042321&do=diff Flush the stream and return the value of error flag checkError(); return value: boolean true/false Language Example no example jet output output for example text/html 2024-02-16T01:12:02+02:00 https://code-reference.com/java/io/printstream/flush?rev=1708042322&do=diff After all pending data is send to stream the stream will be flushed flush(); return value: boolean true/false Language Example no example jet output no output jet text/html 2024-02-16T01:04:32+02:00 https://code-reference.com/cpp/control_structures/while?rev=1708041872&do=diff while #include <iostream> /* including standard library */ while ( condition == true ) { do something until condition untrue } cpp Sourcecode Example #include <iostream> /* including standard library */ using namespace std; int main(void) { int i=0; while (i <= 99) { cout << i << endl; i++; } return 0; } text/html 2013-04-10T10:12:37+02:00 https://code-reference.com/java/lang/object/equals?rev=1365581557&do=diff Compares object and indecates if they equal equals(Object); return value: boolean true/false equals Example in java String a = "42"; String b = "144"; if ( a.equals(b) ) { System.out.println(b+" is the answer"); } else { System.out.println(b+" is probably not the answer"); } text/html 2013-01-24T04:03:54+02:00 https://code-reference.com/lua/codea/stargenerator/main.lua?rev=1358996634&do=diff -- stars function setup() displayMode(FULLSCREEN) createstars() checkagain = false end function createstars() stars = {} for i = 1,175 do --rx = math.random(1,1200) -- ry= math.random(1,800) s= Star(true) --u = { x=rx, y=ry} table.insert(stars,s) end for i = 1,50 do --rx = math.random(1,1200) -- ry= math.random(1,800) s= Star(false) --u = { x=rx, y=ry} table.insert(stars,s) end … text/html 2024-02-16T01:04:11+02:00 https://code-reference.com/arduino/data_types/booleanvariables?rev=1708041851&do=diff A boolean holds one of two values, true or false. (Each boolean variable occupies one byte of memory.) Example int LEDpin = 5; // LED on pin 5 int switchPin = 13; // momentary switch on 13, other side connected to ground boolean running = false; void setup() { pinMode(LEDpin, OUTPUT); pinMode(switchPin, INPUT); digitalWrite(switchPin, HIGH); // turn on pullup resistor } void loop() { if (digitalRead(switchPin) == LOW) { // switch is pressed - pullup keeps pin high … text/html 2024-02-16T01:06:17+02:00 https://code-reference.com/objective-c/control_structures/if?rev=1708041977&do=diff if ( condition == true ){ command; } if example 1 objective c NSString *string = @"i wouldn't want to go anywhere without my wonderful towel"; if ([string isEqualToString:@"i wouldn't want to go anywhere without my wonderful towel"]) { NSInteger a=42; NSLog(@"correct %i", a); } else if ([string isEqualToString:@"42"]) { NSLog(@"Sorry but the answer is not correct"); } text/html 2014-06-04T18:45:53+02:00 https://code-reference.com/cpp/variables?rev=1401900353&do=diff Variables Variables are the means of storing data in a program. Say you want to make a calculator, you need to use variables. Say you want to make a program that takes in a word and then modifies it, you need to use variables. Variables can be created and “destroyed”(deconstructing comes later on so don't get your hopes up). The value or information that they store can be changed and in some cases, that you make it so, cannot be. Except for the syntax of the language, you are in control! text/html 2013-02-15T19:08:10+02:00 https://code-reference.com/arduino/analog_io/analogwrite?rev=1360951690&do=diff Description Writes an analog value ( PWM wave) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to analogWrite(), the pin will generate a steady square wave of the specified duty cycle until the next call to analogWrite() (or a call to digitalRead() or digitalWrite() on the same pin). The frequency of the PWM signal is approximately 490 Hz. text/html 2024-02-16T01:04:07+02:00 https://code-reference.com/arduino/control_structures/for?rev=1708041847&do=diff Desciption The for statement is used to repeat a block of statements enclosed in curly braces. An increment counter is usually used to increment and terminate the loop. The for statement is useful for any repetitive operation, and is often used in combination with arrays to operate on collections of data/pins. text/html 2013-04-18T09:11:21+02:00 https://code-reference.com/java/loops/for?rev=1366269081&do=diff for ( init; condition; increment ){ statements; } description of for a for loop do statements while the condition is true/untrue, the increment counts the loop, it is possible to use more than 1 condition in the for loop example 1 of for in java package codereferececomjava; public class CodeRefereceComJava { public static void main(String[] args) { int myOtherCount=5; for (int i = 0; i <= myOtherCount; i++) { System.out.print… text/html 2024-02-16T01:04:46+02:00 https://code-reference.com/c/control_structures/if?rev=1708041886&do=diff if #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ if ( condition == true ){ command; } C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ int main( void ) { int i; for (i=0;i<=99;i++){ if (i==42) { printf("I have found the answer: %i\n",i); } } return 0; }