problem 1011,求lcm

#include <stdio.h>

#define type_t long long


type_t gcb(type_t a, type_t b);

type_t lcm(type_t a, type_t b);

void swap1(type_t *, type_t *);

int main()
{
	type_t a, b;
	while(scanf("%lld%lld",&a , &b) == 2)
	{
		printf("%lld\n",lcm(a, b));
	}

	return 0;
}

type_t gcb(type_t a, type_t b)
{
	while(a % b)
	{
		a = a % b;
		swap1(&a, &b);
	}

	return b;
}

type_t lcm(type_t a, type_t b)
{
	return a*b/gcb(a,b);
}

void swap1(type_t * a, type_t * b)
{
	int temp = *a;
	* a =  * b;
	*b = temp;
}

 注意数可能越界，用long long， 其实用unsiged long 就可以了