如何修復錯誤C2679：二進制'>>'：沒有找到運算符，它需要

Question

誰能幫我找出錯誤？ 如何解決它們？ 錯誤4錯誤C2264：'PhanSo :: Cong'：函數定義或聲明中的錯誤;功能不叫

錯誤2錯誤C2679：二進制 '>>'：沒有操作員發現它採用類型 '爲const char [3]'

#include <conio.h> 
#include <iomanip> 
#include <iostream> 
using namespace std; 

class PhanSo 
{ 
private: 
    int xtu; 
    int xmau; 
public: 
    void nhap(); 
    void xuat(); 
    PhanSo Cong(const PhanSo &); 
    PhanSo Tru(const PhanSo &); 
    PhanSo Nhan(const PhanSo &); 
    PhanSo Chia(const PhanSo &); 
}; 

void PhanSo::nhap() 
{ 
    cout<<"Nhap tu so: "; 
    cin>>"%d">>xtu; 
    cout<<"Nhap mau so: "; 
    cin>>"%d">>xmau; 
} 
void PhanSo::xuat() 
{ 
    cout<<"\n %d/%d"<<xtu<<xmau; 
} 

int UCLN(int A, int B) 
{ 
    int a = abs(A); 
    int b = abs(B); 
    while(a != b) 
    { 
     if(a > b) 
      A = a - b; 
     else 
      B = b - a; 
    } 
    return A; 

} 
PhanSo PhanSo::Cong(const PhanSo &x) 
{ 
    PhanSo tmp; 
    tmp.xtu = xtu*x.xmau + xmau*x.xtu; 
    tmp.xmau = xmau*x.xmau; 

    int u = UCLN(tmp.xtu,tmp.xmau); 
    tmp.xtu /=u; 
    tmp.xmau /=u; 
    return tmp; 
} 

PhanSo PhanSo::Cong(const PhanSo &x) 
{ 
    PhanSo tmp; 
    tmp.xtu = xtu*x.xmau - xmau*x.xtu; 
    tmp.xmau = xmau*x.xmau; 

    int u = UCLN(tmp.xtu,tmp.xmau); 
    tmp.xtu /=u; 
    tmp.xmau /=u; 
    return tmp; 
} 

PhanSo PhanSo::Nhan(const PhanSo &x) 
{ 
    PhanSo tmp; 
    tmp.xtu = xtu*x.xtu; 
    tmp.xmau = xmau*x.xmau; 

    int u = UCLN(tmp.xtu,tmp.xmau); 
    tmp.xtu /=u; 
    tmp.xmau /=u; 
    return tmp; 
} 

PhanSo PhanSo::Chia(const PhanSo &x) 
{ 
    PhanSo tmp; 
    tmp.xtu = xtu*x.xmau; 
    tmp.xmau = xmau*x.xtu; 

    int u = UCLN(tmp.xtu,tmp.xmau); 
    tmp.xtu /=u; 
    tmp.xmau /=u; 
    return tmp; 
} 

void main() 
{ 
    PhanSo a,b,kq; 
    cout<<"Nhap phan so thu 1"; 
    a.nhap(); 
    cout<<"Nhap phan so thu 2"; 
    b.nhap(); 
    int key; 
    cout<<setw(50)<<"\nMenu"<<endl; 
    cout<<setw(50)<<"\n1. Tinh Tong"; 
    cout<<setw(50)<<"\n2. Tinh Hieu"; 
    cout<<setw(50)<<"\n3. Tinh Tich"; 
    cout<<setw(50)<<"\n4. Tinh Thuong"; 
    cout<<setw(50)<<"\n5. Thoat"; 
    cout<<setw(50)<<"\nBan chon:"; 
    cin>>key; 
    switch (key) 
    { 
    case 1: 
     kq = a.Cong(b); 
     kq.xuat(); 
     break; 
    case 2: 
     kq = a.Tru(b); 
     kq.xuat(); 
     break; 
    case 3: 
     kq = a.Nhan(b); 
     kq.xuat(); 
     break; 
    case 4: 
     kq = a.Chia(b); 
     kq.xuat(); 
     break; 
    case 5: 
     exit(0); 
     break; 
    default: cout<<"nhap sai.\n"; 
     break; 
    } 

} 

Answer 1

更改的右邊的操作數功能nhap和xuat到：

void PhanSo::nhap() 
{ 
    cout<<"Nhap tu so: "; 
    cin>>xtu; 
    cout<<"Nhap mau so: "; 
    cin>>xmau; 
} 
void PhanSo::xuat() 
{ 
    cout<<"\n "<<xtu<< "/" <<xmau; 
} 

你不需要格式化字符串中使用cin像你使用的時候做的時候。