C Foundation

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C Basics

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What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement


What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop


What is Function C User Defined Functions C Recursion C Passing Parameters


Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register


What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings


What is String C String Functions


What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer


What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def


What is Union


What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

Least Common Multiples

What is LCM?

Least Common Multiples(LCM) of two numbers is that multiples of all smallest common divisors until two integers become 1. The LCM is well know as lowest common multiple or smallest common multiple.

LCM Examples:

Two Numbers LCM Value
2, 2 2
2, 3 6
12, 24 24
9, 12 36

Mathematical Representation

We find the lcm of two numbers using mathematical representation

least common multiples

We find the lcm of three numbers using mathematical representation

least common multiples

C Program - LCM

Let us write a simple C program to find the LCM of two integers.

#include <stdio.h>
int main()
int num1, num2, max;
printf("Enter two positive integers: ");
scanf("%d%d", &num1, &num2);
max = (num1 > num2) ? num1 : num2;
if(max % num1 == 0 && max % num2 == 0)
printf("LCM of %d and %d is %d ", num1, num2, max);
return 0;
Enter two positive integers: 12 24
LCM of 12 and 24 is 24


Here we make use of infinite for loop. Clearly first we will find the maximum of two integer. say 2 and 3 then max = 3. if two numbers are not divisible to max, then we will increase the max number count by 1 and we will check again. The same process is repeated over and over again until two numbers are divisible to max. Once two numbers are divisible to max, just return the max number.

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