poj3979

简单题

View Code

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;

int gcd(int x, int y)
{
if (!x || !y)
return x > y ? x : y;
for (int t; t = x % y; x = y, y = t)
;
return y;
}

int main()
{
//freopen("t.txt", "r", stdin);
int a, b, c, d, e, f, g;
char op;
while (scanf("%d/%d%c%d/%d", &a, &b, &op, &c, &d) != EOF)
{
f = b * d;
if (op == '+')
e = a * d + b * c;
else
e = a * d - b * c;
g = gcd(abs(e), abs(f));
e /= g;
f /= g;
if (f < 0)
{
e *= -1;
f *= -1;
}
if (f == 1)
printf("%d\n", e);
else
printf("%d/%d\n", e, f);
}
return 0;
}

转载于:https://www.cnblogs.com/rainydays/archive/2011/07/03/2096892.html