C Program to find the GCD and LCM. In this program we used the Recursion method. Recursion is the programming technique that a process invoking itself again and again. Here find_gcd() and find_(lcm) are the recursive methods. for example LCM and GCD of 8,12 is 24 and 4 Read more about C Programming Language .

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/*

* http://www.c-program-example.com/2011/10/c-program-to-find-gcd-and-lcm-using.html

*/

/* Find this on GitHub:

* https://github.com/snadahalli/cprograms/blob/master/gcd_lcm_rec.c

*/

#include "stdio.h"

int find_gcd(int,int);

int find_lcm(int,int);

int main(){

int num1,num2,gcd,lcm;

printf("nEnter two numbers:n ");

scanf("%d %d",&num1,&num2);

gcd=find_gcd(num1,num2);

printf("nnGCD of %d and %d is: %dnn",num1,num2,gcd);

if(num1>num2)

lcm = find_lcm(num1,num2);

else

lcm = find_lcm(num2,num1);

printf("nnLCM of %d and %d is: %dnn",num1,num2,lcm);

return 0;

}

int find_gcd(int n1,int n2){

while(n1!=n2){

if(n1>n2)

return find_gcd(n1-n2,n2);

else

return find_gcd(n1,n2-n1);

}

return n1;

}

int find_lcm(int n1,int n2){

static int temp = 1;

if(temp % n2 == 0 && temp % n1 == 0)

return temp;

temp++;

find_lcm(n1,n2);

return temp;

}

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## One comment on “C Program to find GCD and LCM using Recursion”

On compiling,it says undefined symbol 'x' in function gcd(int,int)