least common multiple between given number in C

#include
#include
int lcm(int,int);
       
int main(void)
{
    int a,b,c;
    printf("Enter two positive integers:\n");
    scanf ("%d%d",&a,&b);
    c=a*b/lcm(a,b);
    printf("Least Common Multiple of %d and %d is:%d\n",a,b,c);
    getch();
    return 0;
}
int lcm(int a,int b)
{
    int c,greater,smaller;
    if (a>b)
       greater=a,smaller=b;
    else 
       greater=b,smaller=a;
    if(smaller==0) 
       return greater;
    else
       c=lcm(smaller,greater%smaller);
    return c;      
}