# 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

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