Here is a C program to find the Greatest common devisor and the Least common multiple of a number.
#include<stdio.h>
void gcdlcm(int num1,int num2,int*gcd,int*lcm)
{
int i,max;
max=(num1>num2)?num1:num2;//Simple way of saying if num1 is greater
//than num2 max=num1 else max=num2
for(i=1;i<=max;i++)
{
if(num1%i==0&&num2%i==0)
*gcd=i;
}
*lcm=(num1*num2);
}
int main(){
int num1,num2,gcd,lcm;
printf("Enter the first number:");
scanf("%d",&num1);
printf("Enter 2nd number\n");
scanf("%d",&num2);
gcdlcm(num1,num2,&gcd,&lcm);
printf("Gcd of %d and %d is:%d",num1,num2,gcd);
printf("lcm of %d and %d is:%d",num1,num2,lcm);
return 0;
}
The main part of the code is.
max=(num1>num2)?num1:num2;//Simple way of saying if num1 is greater
//than num2 max=num1 else max=num2
for(i=1;i<=max;i++)
{
if(num1%i==0&&num2%i==0)
*gcd=i;
}
*lcm=(num1*num2);
}
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