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Articles on Trending Technologies
Technical articles with clear explanations and examples
Check if a large number is divisibility by 15 in C++
Here we will see how to check a number is divisible by 15 or not. In this case the number is very large number. So we put the number as string.To check whether a number is divisible by 15, if the number is divisible by 5, and divisible by 3. So to check divisibility by 5, we have to see the last number is 0 or 5. To check divisibility by 3, we will see the sum of digits are divisible by 3 or not.Example#include using namespace std; bool isDiv15(string num){ int n = num.length(); if(num[n - ...
Read MoreAssign other value to a variable from two possible values in C++
Problem Statementwe have to assign a variable the value of other variables from two possible values without using any conditional operator.DescriptionIn this problem, we are given a variable let's say a which can have a value of any of the two variables x and y. Now, we have to create a program to assign the value of another than its current value without using any conditional operator i.e. we can’t check the value of x.Let’s take an example to understand the problem better −Input : a = 43 ; x = 43 and y = 21 Output : 21Explanation − ...
Read MoreCheck if a line touches or intersects a circle in C++
Suppose we have a circle and another straight line. Our task is to find if the line touches the circle or intersects it, otherwise, it passes through outside. So there are three different cases like below −Here we will solve it by following steps. These are like below −Find perpendicular P between the center and given a lineCompare P with radius r −if P > r, then outsideif P = r, then touchesotherwise insideTo get the perpendicular distance, we have to use this formula (a center point is (h, k))$$\frac{ah+bk+c}{\sqrt{a^2+b^2}}$$Example#include #include using namespace std; void isTouchOrIntersect(int a, int ...
Read MoreArc length from given Angle in C++?
An Angle is formed when two rays meet at a point. The point on the plane at which these rays meet is vertex.Arc of a circle is a portion of the circumference that is described by an angle.In this problem, we are given an angle of the circle. And we need to find the length of arc using the given diameter of the circle. For example, Input : Angle = 45° Diameter = 28 Output : Arc = 11ExplanationLength of arc = (circumference) X (angle/360°)= (π * d)*(angle/360°)To make a program that calculates the length of Arc from the given ...
Read MoreAssociative arrays in C++
In c++ programming language, an associative array is a special type of array in which the index value can be of any data type i.e. it can be char, float, string, etc. These associative arrays are also known as maps or dictionaries. Also, the indexes are given a different name which is key and the data that is stored at the position of the key is value.So, we can define the associative array as a key-value pair.Let's define an associative array of bikes and their top speed.Bike top speed Ninja 290 S1000rr 310 Bullet 127 Duke 135 R1 286Example#include ...
Read MoreCheck if a Matrix is Invertible in C++
Here we will see how to check whether a matrix is invertible or not. If one matrix is M, then the inverted matrix M-1 will be −$$M^-1=\frac{adj(M)}{|M\lvert}$$So if the determinant of M is non-zero, then only we can get the inverse, otherwise, we will not get the inverse of it. So here we have to check the determinant is non-zero or not. Finding a determinant is one recursive process. We have to find submatrix, then find the determinant of it, then use that result for the final calculation. Let us see the code to get a better idea.Example#include #define ...
Read MoreAverage of a stream of numbers in C++
Average of numbers is the sum of numbers divided by the total number of numbers.In this problem, we are given a stream of numbers. And we will print average of the number at every point.Let’s take an example of how it works −We have a stream of 5 number 24 , 76 , 29, 63 , 88The average at each point of the stream would be −24 , 50 , 43 , 48 , 56.For this we will find the average of the stream every time a number is added to the stream. So, we need to find the average ...
Read MoreAverage of max K numbers in a stream in C++
The average of number in a stream means calculating the average after every insertion. But in this problem, we need to find the average of max K numbers in a stream i.e. only k numbers of the array are considered for calculating the average. When we add a number if it is greater than any of the numbers that contribute to the average then only it is considered otherwise the average remains the same.Let’s take an example to understand the concept better −Input : n = 4 , k = 3 , array = { 4, 9, 1 , 5} ...
Read MoreCheck if a large number is divisible by 2, 3 and 5 or not in C++
Here we will see how to check a number is divisible by 2, 3 and 5 or not. In this case the number is very large number. So we put the number as string.A number will be divisible by 2, 3 and 5 if that number is divisible by LCM of 2, 3 and 5. So the LCM of 2, 3, 5 is 30. We have to check the number is divisible by 30 or not. A number is divisible by 30 when it is divisible by 10 (last digit is 0) and divisible by 3 (sum of all digits ...
Read MoreCheck if a number from every row can be selected such that xor of the numbers is greater than zero in C++
Suppose we have one 2D array of size N x M. The task is to check if we can select a number from every row, in such a way that the XOR of those elements is non-zero or greater than 0. Suppose one matrix is like this −77710107If we perform XOR, the answer will be non-zero, as the except last elements of two rows are 7 and 10To solve this problem, the solution will be very easy. Initially check if XOR of the elements of the first column of each row is 0 or not. If it is non-zero then ...
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