﻿ C Program: Determine the LCM of two numbers using HCF - w3resource

# C Exercises: Determine the LCM of two numbers using HCF

## C For Loop: Exercise-44 with Solution

Write a C program to find the LCM of any two numbers using HCF.

Visual Presentation: Sample Solution:

C Code:

``````#include <stdio.h> // Include the standard input/output header file.

void main()
{
int i, n1, n2, j, hcf = 1, lcm; // Declare variables to store input and results.

printf("\n\n  LCM of two numbers:\n "); // Print a message.
printf("----------------------\n"); // Print a separator.

printf("Input 1st number for LCM: ");  // Prompt the user for input.
scanf("%d", &n1);  // Read the first number from the user.
printf("Input 2nd number for LCM: ");  // Prompt the user for input.
scanf("%d", &n2);  // Read the second number from the user.

j = (n1 < n2) ? n1 : n2;  // Determine the smaller of the two numbers.

// Loop to find the highest common factor (HCF).
for(i = 1; i <= j; i++)
{
if(n1 % i == 0 && n2 % i == 0)
{
hcf = i;  // Update the HCF whenever a common factor is found.
}
}

// Calculate the least common multiple (LCM).
lcm = (n1 * n2) / hcf;

// Print the result.
printf("\nThe LCM of %d and %d is : %d\n\n", n1, n2, lcm);

}
```
```

Sample Output:

```  LCM of two numbers:
----------------------
Input 1st number for LCM: 15
Input 2nd number for LCM: 20

The LCM of 15 and 20 is : 60
```

Flowchart: C Programming Code Editor:

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