Recursion vs Iteration – Difference between Recursion and Iteration

Recursion vs Iteration. What’s the difference between recursion and iteration. Recursion and Iteration both are two different programming approaches. In some cases recursion is best suited and in some other cases iterative way of programming is good.

In programming, repeated set of instructions can be handled either by using recursive or iterative approach in your code. So which approach you choose and why. Let’s talk about recursion vs iteration.

Implementation of Binary Search using Recursion.

Queue Data Structure Implementation Using an Array

Write a program to implement a queue using an array.  In this tutorial, You are going to learn about Queue data structure and their implementation using an array in C, C++ & Java. In my previous posts, I have explained Stack and Linked List data structure.

Queue Data Structure

In Queue data structure, An element is inserted at one end called rear and deleted at other end called front. As compared to stack data structure in which insertion and deletion are allowed only at one end. Queue data structure is also called FIFO (First In First out).

Java Program to Check Prime Number

Write a Java program to check prime number. Given an input integer, We have to write an efficient code to check whether a number is prime or not.

Before writing a program, let’s quickly understand what is a prime number.

Prime Number

A prime number is a number that is greater than 1 and it has no positive divisors other than 1 and itself.

For example – 3, 13, 7  is a prime number, as it’s divisible by 1 and itself. Similarly, 29, 19 etc. are also prime numbers.

6 is not a prime number as it’s divisible by 1, 2, 3 and 6.

 2 is the only even prime number.


How to check whether a number is prime or not in Java

Program to Print Factorial of a Number in PHP – Iterative & Recursive Approach

Write a program to print factorial of a number in PHP. In this tutorial, We are going to write a PHP code to print factorial of a number using iterative as well as recursive approach. Before solving this problem let’s understand what is factorial.

Program to Print Factorial of a Number in PHP

Program to Print Factorial of a Number in PHP

Find Common Elements in Two Arrays – Intersection of two Arrays

Given two sorted arrays, Write a code to find common elements in two arrays. In other words, we have to write a code to find the intersection of two arrays.

Find Common Elements in Two Arrays

Let’s assume following two sorted arrays arr1[] and arr2[].

int arr1[] = {2,  3,  4,  5,  6};
int arr2[] = {4,  6,  7,  8,  9};

So the common elements in these two arrays is 4 and 6.

Generate Prime Numbers between 1 to N – Sieve of Eratosthenes

Write an efficient program to generate prime numbers between 1 to N (Where N is 10, 100, 1000 etc). This question can also be asked like this, Generate prime numbers between 1 to 100 or 1 to 10 etc.

Suppose the value of N is 10, So the prime numbers between 1 to 10 is 2, 3, 5, 7.  Now let’s learn the most efficient algorithm (Sieve of Eratosthenes) to generate Prime Numbers between 1 to N. Before solving this program, let’s understand what is a prime number.

MCQ on Data Structure – Stack and Queue

MCQ on stack and queue data structure. The concept of Stack and Queue data structure is very important in computer science. In my previous post i have discussed following things.

Stack program in C using Array.

Queue data structure and their implementation.

The purpose of this objective questions is to test how well you understand the concept of stack and queue.

Program to Search an Element in an Array

Write a program to search an element in an array. Given a sorted array, how do you search an element in an array. Think for a moment how do you solve this problem.

You can use multiple approaches to find the solution of this problem. But try to solve this problem in minimum time complexity.