﻿ C Program: Determine the LCM of two numbers - w3resource

# C Exercises: Determine the LCM of two numbers

## C For Loop: Exercise-45 with Solution

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

Visual Presentation:

Sample Solution:

C Code:

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

void main()
{
int i, n1, n2, max, lcm = 1;  // 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.

max = (n1 > n2) ? n1 : n2;  // Determine the larger of the two numbers.

// Loop to find the least common multiple (LCM).
for (i = max; ; i += max)
{
if (i % n1 == 0 && i % n2 == 0)
{
lcm = i;  // Update the LCM whenever a common multiple is found.
break;  // Exit the loop once LCM is found.
}
}

// Print the result.
printf("\nLCM of %d and %d = %d\n\n", n1, n2, lcm);
}
```
```

Output:

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

LCM of 15 and 20 = 60
```

Flowchart:

C Programming Code Editor:

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