Basic Programs Every Beginner Must Know (LCM, Sum, Factorial)

These are the most important beginner problems asked in interviews and tests. Let’s understand them with logic + flow + code in 3 languages. 1. Sum of N Numbers Find the sum from a starting number to an ending number. Python output JAVA import java.util.Scanner ; public class SumN { public static void main ( String [] args ) { Scanner sc = new Scanner ( System . in ); int start = sc . nextInt (); int end = sc . nextInt (); int result = 0 ; while ( start <= end ) { result += start ; start ++; } System . out . println ( result ); } } JavaScript let start = 1 ; let end = 10 ; let result = 0 ; while ( start <= end ) { result += start ; start ++ ; } console . log ( result ); 2. LCM (Least Common Multiple) Find the smallest number divisible by both numbers. Python output JAVA import java.util.Scanner ; public class LCM { public static void main ( String [] args ) { Scanner sc = new Scanner ( System . in ); int a = sc . nextInt (); int b = sc . nextInt (); int max = ( a > b ) ? a : b ; while