Problem S: 分数类的模板数组类

4
6 8 7 5
9
1 3
20 -15
80 150
-9 1
6 6
12 16
-33 -48
6 11
0 -10

#include <iostream>
#include <cmath>
#include <vector>
using namespace std;
int yinshu(int x, int y)
{
    int mm;
    if(x>y)
        mm=y;
    else
        mm=x;
    int temp;
    for(int i=1; i<=mm; i++)
        if(x%i==0&&y%i==0)
        temp=i;
    return temp;
}
template <typename T>
class Array
{
public :
    vector<T> num;
    int len;
    Array(int n):len(n){}
    void input(int n)
    {
        for(int i=0; i<n&&i<len; i++)
        {
            T temp;
            cin>>temp;
            num.push_back(temp);
        }
    }
    T &operator[](int n){return num[n];}
};
class Fract
{
public :
    int n, m;
    int t;
    Fract(int x=0, int y=1)
    {
        int min_;
        if(x*y<0) t=-1; else t=1;

        int xx=x, yy=y;

        if(xx<0) xx=-xx;
        if(yy<0) yy=-yy;

        if(xx>yy) min_=yy; else min_=xx;
        for(int i=min_; i>1; i--)
            if(xx%i==0&&yy%i==0)
        {
            xx/=i; yy/=i;
        }
        n=xx*t; m=yy;
    }
    Fract &operator+=(Fract &p)
    {
        Fract temp(n*(p.m)+(p.n)*m,m*(p.m));
        return *this=temp;//必须返回本身。
    }
    void show()
    {
        if(n==0) cout<<0<<endl;
        else if(m==1)  cout<<n<<endl;
        else
        cout<<n<<"/"<<m<<endl;

    }
    friend istream &operator>>(istream &is, Fract &p)
    {
        int x, y;
        is>>x>>y;
        Fract temp(x,y);
        p.n=temp.n; p.m=temp.m;
        return is;
    }
};
int main()
{
    int  n;
    cin >> n;
    Array<double> db(1000);
    db.input(n);
    double dbsum(0.0);
    for(int i = 0; i < n; i++)
        dbsum += db[i];
    cout << dbsum << endl;

    cin >> n;
    Array<Fract> fr(1000);
    fr.input(n);
    Fract frsum(0, 1);
    for(int i = 0; i < n; i++)
        frsum += fr[i];
    frsum.show();
}