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In this tutorial, we will be discussing a program to find the convex hull of a given set of points using Jarvis’s Algorithm.Convex hull is the smallest polygon convex figure containing all the given points either on the boundary on inside the figure.In Jarvis’s algorithm, we select the leftmost point and keep wrapping points moving in the clockwise direction.Example Live Demo#include using namespace std; //structure of the point struct Point{ int x, y; }; //calculating the position of the points int cal_orientation(Point p, Point q, Point r){ int val = (q.y - p.y) * (r.x - q.x) - ... Read More
In this tutorial, we will be discussing a program to convert seconds into days, hours, minutes and seconds.For this we will be provided with a random number of seconds. Our task is to convert it into proper number of days, hours, minutes and seconds respectively.Example Live Demo#include using namespace std; //converting into proper format void convert_decimal(int n) { int day = n / (24 * 3600); n = n % (24 * 3600); int hour = n / 3600; n %= 3600; int minutes = n / 60 ; n %= 60; int seconds = n; cout
Some characters are reserved in HTML and they have special meaning when used in HTML document. For example, you cannot use the greater than and less than signs or angle brackets within your HTML text because the browser will treat them differently and will try to draw a meaning related to HTML tag.HTML processors must support following five special characters listed in the table that follows.SymbolDescriptionEntity NameNumber Code "quotation mark""'apostrophe''&ersand&&greater-than>>
In this tutorial, we will be discussing a program to find the coordinates of rectanglewith given points lying inside.For this we will be provided with some coordinate points. Our task is to find the smallest rectangle such that all the points lie inside it and it should have its sides parallel to the coordinate axis.Example Live Demo#include using namespace std; //calculating the coordinates of smallest rectangle void print_rectangle(int X[], int Y[], int n){ //finding minimum and maximum points int Xmax = *max_element(X, X + n); int Xmin = *min_element(X, X + n); int Ymax = *max_element(Y, ... Read More
We know that ternary operator is implemented instead of if..else clause. It is denoted by ?: . '?' symbol is equivalent to if part and ':' is equivalent to else part. The following 3 programs explain some interesting observation in case of ternary operator.The following program is able to compile without any error. Ternary expression’s return type is expected to be float (as that of exp2) and exp3 (i.e. literal zero - int type) is able to implicitly convert to float.#include using namespace std; int main(){ int test1 = 0; float fvalue = 3.111f; cout
In this tutorial, we will be discussing a program to find the convex hull of a given set of points.Convex hull is the smallest polygon convex figure containing all the given points either on the boundary on inside the figure.In this program, we will use brute force to divide the given points into smaller segments and then finally merging the ones that follow on to construct the convex hull.Example Live Demo#include using namespace std; //storing the center point of polygon pair mid; //calculating the quadrant of //a particular point int quad(pair p){ if (p.first >= 0 && p.second >= 0) ... Read More
Cross-origin resource sharing (CORS) is a mechanism to allows the restricted resources from another domain in a web browserFor suppose, if you click on HTML5- video player in html5 demo sections. It will ask camera permission. If the user allows the permission then only it will open the camera or else it doesn't open the camera for web applications.The following is an example of event handlers in CORS:xhr.onload = function() { var responseText = xhr.responseText; // process the response. console.log(responseText); }; xhr.onerror = function() { console.log('There was an error!'); };
Two-way communication between the browsing contexts is called channel messaging. It is useful for communication across multiple origins.While creating messageChannel, it internally creates two ports to send the data and forwarded to another browsing context.postMessage() − Post the message throw channelstart() − It sends the dataclose() − it close the portsIn this scenario, we are sending the data from one iframe to another iframe. Here we are invoking the data in function and passing the data to DOM.var loadHandler = function(){ var mc, portMessageHandler; mc = new MessageChannel(); window.parent.postMessage('documentAHasLoaded', 'http://foo.example', [mc.port2]); portMessageHandler = function(portMsgEvent){ ... Read More
Create a new web browsing context either by creating new iframe or new window. We can send the data using with postMessage() and it has two arguments. They are asmessage − The message to sendtargetOrigin − Origin nameLet us see an example to send a message from iframe to button:var iframe = document.querySelector('iframe'); var button = document.querySelector('button'); var clickHandler = function(){ iframe.contentWindow.postMessage('The message to send.','https://www.tutorialspoint.com); } button.addEventListener('click',clickHandler,false);
Microdata introduces five global attributes that would be available for any element to use and give context for machines about your data.AttributeDescriptionItemscopeThis is used to create an item. The itemscope attribute is a boolean attribute that tells that there is Microdata on this page, and this is where it starts.Itemtype This attribute is a valid URL which defines the item and provides the context for the properties.ItemidThis attribute is a global identifier for the item.ItempropThis attribute defines a property of the item.ItemrefThis attribute gives a list of additional elements to crawl to find the name-value pairs of the item.Read More