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Programming Articles
Page 1488 of 2547
Check if a point is inside, outside or on the ellipse in C++
Suppose, one ellipse is given (the center coordinate (h, k) and semi-major axis a, and semi-minor axis b), another point is also given. We have to find whether the point is inside the ellipse or not. To solve it, we have to solve the following equation for the given point (x, y).$$\frac{\left(x-h\right)^2}{a^2}+\frac{\left(y-k\right)^2}{b^2}\leq1$$If the result is less than one, then the point is inside the ellipse, otherwise not.Example#include #include using namespace std; bool isInsideEllipse(int h, int k, int x, int y, int a, int b) { int res = (pow((x - h), 2) / pow(a, 2)) + (pow((y ...
Read MoreCheck if a point is inside, outside or on the parabola in C++
Suppose, one parabola is given (the vertex coordinate (h, k) and distance from focus and vertex is a), another point is also given. We have to find whether the point is inside the parabola or not. To solve it, we have to solve the following equation for the given point (x, y)\left(y-k\right)^2=4a\left(x-h\right)If the result is less than 0, then this is present inside the parabola if it is 0, then it is on the parabola, and if greater than 0, then outside of the parabola.Example#include #include using namespace std; int isInsideParabola(int h, int k, int x, int y, ...
Read MoreCheck if a string contains only alphabets in Java using Regex
At first, convert the string into character array. Here, name is our string −char[] ch = name.toCharArray();Now, loop through and find whether the string contains only alphabets or not. Here, we are checking for not equal to a letter for every character in the string −for (char c : ch) { if(!Character.isLetter(c)) { return false; }Following is an example to check if a string contains only alphabets using RegexExamplepublic class Main { public static boolean checkAlphabet(String name) { char[] ch = name.toCharArray(); for (char c : ch) { ...
Read MoreMinimize Cash Flow among a given set of friends who have borrowed money from each other in C++
Suppose there are few friends. They have borrowed money from each other. So there will be some cash flow on the network. Our task is to minimize the cash flow in the network. Suppose there are three friends P1, P2, and P3. The cash flow among them is like below −This cash flow is not minimum; we have to minimize it. Then the final diagram will be like −To solve this problem we will use the greedy approach. Here in each step settle all amounts of one person and recur for remaining n-1 persons. Now the question comes, how to ...
Read MoreFind K Closest Points to the Origin in C++
Suppose we have a set of points. Our task is to find K points which are closest to the origin. Suppose the points are (3, 3), (5, -1) and (-2, 4). Then the closest two (K = 2) points are (3, 3), (-2, 4).To solve this problem, we will sort the list of points based on their Euclidean distance, after that take the top most K elements from the sorted list. Those are the K nearest points.Example#include #include using namespace std; class Point{ private: int x, y; public: Point(int x = 0, int y = 0){ this->x = x; this->y = y; } void display(){ cout
Read MoreIn how many ways we can convert a String to a character array using Java?
You can convert a String to a character array either by copying each element of the String to an array or, using the toCharArray() method.Copying each elementGet the String to be converted.Create an empty character array with the length of the String.The charAt() method of the String class returns the character at a particular position. Using this method copy each character of the String to the array.Exampleimport java.util.Arrays; import java.util.Scanner; public class StringToCharArray { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.println("Enter a String value: "); ...
Read MoreFind Simple Closed Path for a given set of points in C++
Consider we have a set of points. We have to find a simple closed path covering all points. Suppose the points are like below, and the next image is making a closed path on those points.To get the path, we have to follow these steps −Find the bottom left point as PSort other n – 1 point based on the polar angle counterclockwise around P, if polar angle of two points are same, then put them as the distance is shortestTraverse the sorted list of points, then make the pathExample#include using namespace std; class Point { public: ...
Read MoreFinding Quadrant of a Coordinate with respect to a Circle in C++
We have one circle (center coordinate and radius), we have to find the quadrant of another given point (x, y) lies with respect to the center of the circle, if this is present in the circle, print quadrant, otherwise print error as the point is present outside.Suppose the center of the circle is (h, k), the coordinate of the point is (x, y). We know that the equation of the circle is −(𝑥−ℎ)2+(𝑦−𝑘)2+𝑟2=0Now there are few conditions, based on which we can decide the result.𝑖𝑓 (𝑥−ℎ)2+(𝑦−𝑘)2> 𝑟, 𝑡ℎ𝑒𝑛 𝑡ℎ𝑒 𝑝𝑜𝑖𝑛𝑡 𝑖𝑠 𝑜𝑢𝑡𝑠𝑖𝑑𝑒 𝑡ℎ𝑒 𝑐𝑖𝑟𝑐𝑙𝑒𝑖𝑓 (𝑥−ℎ)2+(𝑦−𝑘)2= 0, 𝑡ℎ𝑒𝑛 𝑡ℎ𝑒 𝑝𝑜𝑖𝑛𝑡 𝑖𝑠 ...
Read MoreHow to get Exception log from a console and write it to external file in java?
There are several logging frame works available to log your data in to files. You can also define your own method.Example − Using I/O packageFollowing Java program has an array storing 5 integer values, we are letting the user to choose two elements from the array (indices of the elements) and performing division between them. We are wrapping this code in try block with three catch blocks catching ArithmeticException, InputMismatchException and, ArrayIndexOutOfBoundsException. In each of them we are invoking the writeToFile() method.This method accepts an exception object, and appends it to a file using the write() method of the Files ...
Read MoreCan we to override a catch block in java?
DescriptionWhen a piece of code in particular method throws an exception, and is handled using try-catch pair. If we are calling this method from another one and, the calling line is wrapped within try-catch pair. Now, how can I override the catch block by the catch block of the calling method.When a piece of code in a method throws an exception (compile time) we must either handle it by wrapping it within the try-catch pair or, throw it (postpone) to the calling method using the throws keyword else a compile time error occurs.In the following Java example the code in ...
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