C Program to Find LCM of a Number using Recursion

The following C program, using recursion, finds the LCM. An LCM is the lowest common multiple of any 2 numbers.

Here is the source code of the C program to find LCM of a Number using Recursion. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C Program to Find LCM of a Number using Recursion
  3.  */
  4. #include <stdio.h>
  6. int lcm(int, int);
  8. int main()
  9. {
  10.     int a, b, result;
  11.     int prime[100];
  13.     printf("Enter two numbers: ");
  14.     scanf("%d%d", &a, &b);
  15.     result = lcm(a, b);
  16.     printf("The LCM of %d and %d is %d\n", a, b, result);
  17.     return 0;
  18. }
  20. int lcm(int a, int b)
  21. { 
  22.     static int common = 1;
  24.     if (common % a == 0 && common % b == 0)
  25.     {
  26.         return common;
  27.     }
  28.     common++;
  29.     lcm(a, b);
  30.     return common;
  31. }

$ cc pgm22.c
$ a.out
Enter two numbers: 456
The LCM of 456 and 12 is 456
$ a.out
Enter two numbers: 45 75
The LCM of 45 and 75 is 225

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If you wish to look at other example programs on Mathematical Functions, go to C Programming Examples on Mathematical Functions. If you wish to look at programming examples on all topics, go to C Programming Examples.
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