分数计算器

#include<iostream>
using namespace std;


class Fraction
{
    private:
        int f1;  //分子
        int f2;   //分母
    public:
        Fraction(int i=0,int j=1):f1(i),f2(j){}
        void gs()//格式函数
        {
            int q=f1;
            int w=f2;
            int p=q/w;
            for(;p!=0;)   //辗转相除法求最大公约数
            {
                int m=q%w;
                q=w;
                w=m;
               
                p=q/w;
               
               
            }
            f1/= w;
            f2/=w;
            
        }
        void jiaf(const Fraction &copy)//加法
        {
            f1=f1*copy.f2+f2*copy.f1;
            f2=f2*copy.f2 ;
        }
        void jianf(const Fraction &copy)//减法
        {
            f1=f1*copy.f2-f2*copy.f1;
            f2=f2*copy.f2;
        }
        void chengf(const Fraction &copy)//乘法
        {
            f1*=copy.f1;
            f2*=copy.f2;
        }
        void chuf(const Fraction &copy)//除法
        {
            f1*=copy.f2;
            f2*=copy.f1;
        }
        
        void Show()
        {
            cout<<"分子:"<<f1<<"分母："<<f2<<endl;
        }
        Fraction( const Fraction &cp)  //复制构造函数
        {
            f1=cp.f1;
            f2=cp.f2;
        }
        ~Fraction(){
        }
    };



int main()
{
   
    void Show();
    cout<<"输入1个分数的分子与分母："<<endl;
    int fz1,fm;
    cin>>fz1>>fm;
    Fraction fz(fz1,fm);
   
    cout<<"输入第二个分数的分子与分母："<<endl;
    int fz2,fm2;
    cin>>fz2>>fm2;
    Fraction fr(fz2,fm2);
   
    Show();
    char c1;
    cin>>c1;
    fz.gs();
    fr.gs();
   
    while(c1!='-'&&c1!='+'&&c1!='/'&&c1!='*')
    {
        Show();
        cin>>c1;   //排除出入的符号不是 加减乘除的符号
    }
    switch(c1)
    {
        case '+':
            fz.jiaf(fr);
            break;
        case '-':
            fz.jianf(fr);
            break;
        case '*':
            fz.chengf(fr);
            break;
        case '/':
            fz.chuf(fr);
            break;
            
    }
    fz.gs();
    cout<<"执行："<<c1<<endl;
    cout<<"结果是："<<endl;
     
    fz.Show();
    return 0;

}
void Show(){
    cout<<"1 进行 +  运算"<<endl;
    cout<<"2 进行 — 运算"<<endl;
    cout<<"3 进行 /  运算"<<endl;
    cout<<"4 进行 *  运算"<<endl;
    cout<<"运算符号："<<endl;
   
}