/* fopen example */#include 
     
      #include 
      
       using namespace std;int main(){    FILE* fp;    fp = fopen("C:/Users/Qin/Desktop/123.txt", "rb");    if ((fp == NULL))    {        printf("\nerror on open C:/Users/Qin/Desktop/123.txt!");        _getch();        exit(1);    }    else    {        cout<<"the file C:/Users/Qin/Desktop/123.txt can be open correctly!" << endl;    }    system("pause");    return 0;}