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Articles on Trending Technologies
Technical articles with clear explanations and examples
string.char() function in Lua programming
There are so many scenarios where you might want to convert a decimal value into a character representation. The character representation of a decimal or integer value is nothing but the character value, which one can interpret using the ASCII table.In Lua, to convert a decimal value to its internal character value we make use of the string.char() function.Syntaxstring.char(I)In the above syntax, the identifier I represents the decimal value which we want to convert into a character.ExampleLet’s consider a very simple example, where you are given different decimal values, and you want to convert them to a character value.Consider the ...
Read Morek-Rough Number or k-Jagged Number in C++
In this tutorial, we are going to write a program that checks whether the given number is k-rough or k-jagged number or not.The number whose smallest prime factor is greater than or equal to the given k, it is called k-rough or k-jagged number.Let's see the steps to solve the problem.Initialise the numbers n and k.Find all the prime numbers that are factors of n and store them in a vector.Get the first element from the vector and compare it with k to check whether n is k-rough or k-jagged number or not.ExampleLet's see the code.#include using namespace std; ...
Read Morestring.format() function in Lua programming
There are cases when we want to format strings which will help us to print the output in a particular format.When we use the string.format() function it returns a formatted version of its variable number of arguments following the description given by its first argument, the so-called format string.The format string that we get the output, is similar to those of the printf function of standard C: It is composed of regular text and directives, which control where and how each argument must be placed in the formatted string.Syntaxstring.format(“s = %a”)The string.format() syntax above contains an identifier s which is ...
Read Morestring.lower() function in Lua programming
There are certain scenarios in our code that when we are working with the strings, we might want some string to be in lowercase, like consider a very basic case of an API which is using an authentication service, and the password for that authentication service should in lowercase, and in that case, we need to convert whatever the password the user enters into lowercase.Converting a string to its lowercase in Lua is done by the string.lower() function.Syntaxstring.lower(s)In the above syntax, the identifier s denotes the string which we are trying to convert into its lowercase.ExampleLet’s consider a very simple ...
Read Morestring.upper() function in Lua programming
There are certain scenarios in our code that when we are working with the strings, we might want some string to be in uppercase, like consider a very basic and yet famous example of such scenario, the PAN number.Imagine that you are making a web form in which there’s a field for the PAN number of the user, and since you know that PAN number can’t be in lowercases, we need to take the user input of that field and convert the string into its uppercase.Converting a string to its uppercase in Lua is done by the string.upper() function.Syntaxstring.upper(s)In the ...
Read MoreK-th digit in 'a' raised to power 'b' in C++
In this tutorial, we are going to write a program that finds the k-th digit from the right side in the number abIt's a straightforward problem. Let's see the steps to solve it.Initialise the numbers a, b, and k.Find the value of abusing pow method.Write a loop that iterates until power value is less than zero or count is less than k.Get the last digit from the power value.Increment the counter.Check whether k and counter are equal or not.Return the digit if they are equalReturn -1.ExampleLet's see the code.#include using namespace std; int getTheDigit(int a, int b, int k) ...
Read MoreK-th Element of Two Sorted Arrays in C++
In this tutorial, we are going to write a program that finds the k-th element from thee merged array of two sorted arrays.Let's see the steps to solve the problem.Initialise the two sorted arrays.Initialise an empty array of size m + n.Merge the two arrays into the new array.Return the k - 1 element from the merged array.ExampleLet's see the code.#include using namespace std; int findKthElement(int arr_one[], int arr_two[], int m, int n, int k) { int sorted_arr[m + n]; int i = 0, j = 0, index = 0; while (i < m && j ...
Read MoreK-th Greatest Element in a Max-Heap in C++
In this tutorial, we are going to write a program that finds the k-th largest element from the max-heap.We will use priority queue to solve the problem. Let's see the steps to complete the program.Initialise the max-heap with correct values.Create a priority queue and insert the root node of the max-heap.Write a loop that iterates k - 1 times.Pop the greatest element from the queue.Add the left and right nodes of the above node into the priority queue.The greatest element in priority queue is the k-th greatest element now.Return it.ExampleLet's see the code.#include using namespace std; struct Heap { ...
Read Morek-th missing element in an unsorted array in C++
In this tutorial, we are going to write a program that finds out the k-th missing element in the given unsorted array.Find the k-th number that is missing from min to max in the given unsorted array. Let's see the steps to solve the problem.Initialise the unsorted array.Insert all the elements into a set.Find the max and min elements from the array.Write a loop that iterates from min to max and maintain a variable for the count.If the current element is present in the set, then increment the count.If the count is equal to k, then return i.ExampleLet's see the ...
Read Morek-th missing element in sorted array in C++
In this tutorial, we are going to write a program that finds out the k-th missing element in the given sorted array.Find the k-th number that is missing from min to max in the given unsorted array. Let's see the steps to solve the problem.Initialise the sorted array.Initialise two variables difference and count with k.Iterate over the array.If the current element is not equal to the next element.Find the difference between the two numbers.If the difference is greater than or equal to k, then return current element plus count.Else subtract difference from the count.Return -1.ExampleLet's see the code.#include using ...
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