#include <stdio.h>
#include <stdlib.h>

struct rational {
	int a,b;
};

struct rational make_rational(int a,int b)
{
	struct rational z;
	z.a=a;
	z.b=b;
	return z;
}

struct rational add_rational(struct rational a,struct rational b)
{
	struct rational c;
	c.a=a.a*b.b+a.b*b.a;
	c.b=a.b*b.b;
	return c;
}

struct rational sub_rational(struct rational a,struct rational b)
{
	struct rational c;
	c.a=a.a*b.b-a.b*b.a;
	c.b=a.b*b.b;
	return c;
}

struct rational mul_rational(struct rational a,struct rational b)
{
	struct rational c;
	c.a=a.a*b.a;
	c.b=a.b*b.b;
	return c;
}

struct rational div_rational(struct rational a,struct rational b)
{
	struct rational c;
	c.a=a.a*b.b;
	c.b=a.b*b.a;
	return c;
}
int gcd (int a,int b)
{
	if(b==0)
		return abs(a);
	else
		return gcd(b,a%b);
}

void print_rational(struct rational a)
{
	int ra_gcd=gcd(a.a,a.b);
	a.a=a.a/ra_gcd;		
	a.b=a.b/ra_gcd;
	if(a.a==0)
		printf("0\n");
	else if(abs(a.b)==1)
		printf("%d\n",a.a/a.b);
	else
		printf("%d/%d\n",a.a,a.b);
}
int main(int argc, char* argv[])
{
	struct rational a = make_rational(-1, 8); /* a=1/8 */
	struct rational b = make_rational(-1, 8); /* b=-1/8 */
	print_rational(add_rational(a, b));
	print_rational(sub_rational(a, b));
	print_rational(mul_rational(a, b));
	print_rational(div_rational(a, b));
	return 0;
	system("pause");
}