1022.c

//1022 - TDA Racional
/* 28/02/2015 - 1022 _ TDA Racional
https://www.urionlinejudge.com.br/judge/pt/problems/view/1022
*/

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

int mdc(int a, int b)
{
	if(a<0)
		a = -a;
	if(b<0)
		b = -b;
	if(a%b == 0)
		return b;
	else
		return mdc(b,a%b);
}


int main (){
	int N, n1, d1, n2, d2, num, den, div;
	char oper;

	scanf("%d", &N);

	do{
		scanf("%d / %d %c %d / %d", &n1, &d1, &oper, &n2, &d2);

		if(oper == '+'){
			num = (n1*d2 + n2*d1);
			den = (d1*d2);
		}

		else if(oper == '-'){
			num = (n1*d2 - n2*d1);
			den = (d1*d2);
		}

		else if(oper == '*'){
			num = (n1*n2);
			den = (d1*d2);
		}

		else if(oper == '/'){
			num = (n1*d2);
			den = (n2*d1);
		}

		div = mdc(num,den);

		printf("%d/%d = %d/%d\n", num, den, num/div, den/div);

		N--;
	} while (N>0);
	return 0;
}