http://technotip.com/6959/c-program-to-find-sum-of-all-even-numbers-from-1-to-n-using-while-loop/ Lets write a C program to find sum of all the even numbers from 1 to N, using while loop. Even Number: An even number is an integer that is exactly divisible by 2. For Example: 8 % 2 == 0. When we divide 8 by 2, it give a reminder of 0. So number 8 is an even number. If user enters num = 5. Even numbers between 1 to 5 are 2, 4. So we add 2 and 4. 2 + 4 = 6. We display 6 to the console window as result. C Programming Interview / Viva Q&A List http://technotip.com/6378/c-programming-interview-viva-qa-list/ C Programming: Beginner To Advance To Expert http://technotip.com/6086/c-programming-beginner-to-advance-to-expert/ ... https://www.youtube.com/watch?v=EZeusHqc0Rc

https://technotip.com/8127/c-program-to-find-gcd-of-two-numbers-using-recursion-euclids-algorithm/ Lets write a C program to find GCD(Greatest Common Divisor) or HCF(Highest Common Factor) of two positive integer numbers input by the user using Euclid’s Algorithm and by using Recursive function call logic. Expected Input/Out Enter 2 positive integer numbers 1980 1617 GCD of 1980 and 1617 is 33. Euclid’s Algorithm Logic If user inputs 2 numbers n1 and n2, reduce the bigger number by modulo dividing it by the smaller number. For example, if n1 is greater than n2, then reduce the value of n1 by replacing it with n1%n2. Assume that we’ve a function gcd() which returns gcd of 2 numbers passed to it. Ex: gcd(n1, n2); According to Euclid’s Algorithm, we’ll get the same gcd if we reduce the bigger number by modulo dividing it by smaller number. If n1 is greater than n2 we need to pass gcd(n1%n2, n2); If n2 is greater than n1, we need to pass gcd(n1, n2%n1); We need to recursively execute above 2 lines of logic until either n1 is 0 or until n2 is 0. If n1 is 0, then value present in n2 is the gcd of (n1,n2). If n2 is 0, then value present in n1 is the gcd of (n1,n2). C Programming Interview / Viva Q&A List https://technotip.com/6378/c-programming-interview-viva-qa-list/ C Programming: Beginner To Advance To Expert https://technotip.com/6086/c-programming-beginner-to-advance-to-expert/ ... https://www.youtube.com/watch?v=k6zrTKpSg20