我需要显示具有特定日期的记录。请检查“void display_fromDate”。我收到错误“char之前的预期主表达式”并指向“int main（） - ＆gt;案例2.感谢您的建议。
#include<iostream>
#include<fstream>
#include<iomanip>
using namespace std;
class patient
{
int contactnum;
char name[50];
//float add;
char bookingDate[15];
char bookingTime[5];
char trtType[15];
//int add, bookingDate, bookingTime;
//double per;
//char grade;
//void calculate();
public:
void getdata();
void showdata() const;
void show_tabular() const;
int getIDNum() const;
char bDate() const;
};
/*void patient::calculate()
{
per=(physics+chemistry+mathematics+english+comscience)/5.0;
if(per>=90)
grade='A+';
else if(per>=80)
grade='A';
else if(per>=75)
grade='A-';
else if(per>=70)
grade='B+';
else if(per>=65)
grade='B';
else if(per>=60)
grade='B-';
else if(per>=55)
grade='C+';
else if(per>=50)
grade='C';
else
grade='F';
}*/
void patient::getdata()
{
cout<<"\nEnter The Contact Number of the Patient ";
cin>>contactnum;
cout<<"\n\nEnter Patient's Name: ";
cin.ignore();
cin.getline(name,50);
cout<<"\nEnter Booking Date: ";
cin>>bookingDate;
cout<<"\nEnter Booking Time: ";
cin.ignore();
cin>>bookingTime;
cout<<"\nEnter Treatment Type: ";
cin>>trtType;
//calculate();
}
void patient::showdata() const
{
cout<<"\nContact Number: "<<contactnum;
cout<<"\nName: "<<name;
cout<<"\nBooking Date: "<<bookingDate;
cout<<"\nBooking Time: "<<bookingTime;
cout<<"\nTreatment Type: "<<trtType;
}
void patient::show_tabular() const
{
cout<<contactnum<<setw(6)<<" "<<name<<setw(4)<<bookingDate<<setw(4)<<bookingTime<<setw(4)<<trtType<<endl;
}
int patient::getIDNum() const
{
return contactnum;
}
void Savepatient();
void displayAll();
void Searchdisplay(int);
void modifypatient(int);
void deletepatient(int);
void DisplayClassResult();
void DisplayResult();
void write_patient()
{
patient st;
ofstream outFile;
outFile.open("patient.dat",ios::binary|ios::app);
st.getdata();
outFile.write(reinterpret_cast<char *> (&st), sizeof(patient));
outFile.close();
cout<<"\n\nPatient record has been Created ";
cin.ignore();
cin.get();
}
/*void display_all()
{
patient st;
ifstream inFile;
inFile.open("patient.dat",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
cin.ignore();
cin.get();
return;
}
cout<<"\n\n\n\t\tDISPLAY ALL RECORD !!!\n\n";
while(inFile.read(reinterpret_cast<char *> (&st), sizeof(patient)))
{
st.showdata();
cout<<"\n\n====================================\n";
}
inFile.close();
cin.ignore();
cin.get();
}*/
void display_fromDate(char n)
{
patient st;
ifstream inFile;
inFile.open("patient.dat",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
cin.ignore();
cin.get();
return;
}
bool flag=false;
while(inFile.read(reinterpret_cast<char *> (&st), sizeof(patient)))
{
if(st.bDate()==n)
{
st.showdata();
flag=true;
}
}
inFile.close();
if(flag==false)
cout<<"\n\nrecord not exist...";
cin.ignore();
cin.get();
}
void display_sp(int n)
{
patient st;
ifstream inFile;
inFile.open("patient.dat",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
cin.ignore();
cin.get();
return;
}
bool flag=false;
while(inFile.read(reinterpret_cast<char *> (&st), sizeof(patient)))
{
if(st.getIDNum()==n)
{
st.showdata();
flag=true;
}
}
inFile.close();
if(flag==false)
cout<<"\n\nrecord not exist...";
cin.ignore();
cin.get();
}
void modify_patient(int n)
{
bool found=false;
patient st;
fstream File;
File.open("patient.dat",ios::binary|ios::in|ios::out);
if(!File)
{
cout<<"File could not be open !! Press any Key...";
cin.ignore();
cin.get();
return;
}
while(!File.eof() && found==false)
{
File.read(reinterpret_cast<char *> (&st), sizeof(patient));
if(st.getIDNum()==n)
{
st.showdata();
cout<<"\n\nPlease Enter The New Details of Patient"<<endl;
st.getdata();
int pos=(-1)*static_cast<int>(sizeof(st));
File.seekp(pos,ios::cur);
File.write(reinterpret_cast<char *> (&st), sizeof(patient));
cout<<"\n\n\t Record Updated";
found=true;
}
}
File.close();
if(found==false)
cout<<"\n\n Record Not Found ";
cin.ignore();
cin.get();
}
void delete_patient(int n)
{
patient st;
ifstream inFile;
inFile.open("patient.dat",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
cin.ignore();
cin.get();
return;
}
ofstream outFile;
outFile.open("Temp.dat",ios::out);
inFile.seekg(0,ios::beg);
while(inFile.read(reinterpret_cast<char *> (&st), sizeof(patient)))
{
if(st.getIDNum()!=n)
{
outFile.write(reinterpret_cast<char *> (&st), sizeof(patient));
}
}
outFile.close();
inFile.close();
remove("patient.dat");
rename("Temp.dat","patient.dat");
cout<<"\n\n\tRecord Deleted ..";
cin.ignore();
cin.get();
}
void class_result()
{
patient st;
ifstream inFile;
inFile.open("patient.dat",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
cin.ignore();
cin.get();
return;
}
cout<<"\n\n\t\tALL PATIENTS BOOKING DETAILS\n\n";
cout<<"==============================================================\n";
cout<<"Mobile.No Name Booking Date Booking Time"<<endl;
cout<<"==============================================================\n";
while(inFile.read(reinterpret_cast<char *> (&st), sizeof(patient)))
{
st.show_tabular();
}
cin.ignore();
cin.get();
inFile.close();
}
int main()
{
char ch;
int num;
cout.setf(ios::fixed|ios::showpoint);
cout<<setprecision(2);
do
{
system("cls");
cout<<"\t@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@";
cout<<"\n\n\t1.CREATE PATIENT RECORD";
cout<<"\n\n\t2.DISPLAY ALL PATIENTS RECORDS";
cout<<"\n\n\t3.SEARCH PATIENT RECORD ";
cout<<"\n\n\t4.MODIFY PATIENT RECORD";
cout<<"\n\n\t5.DELETE PATIENT RECORD";
cout<<"\n\n\t6.DISPLAY CLASS RESULT";
cout<<"\n\n\t7.EXIT";
cout<<"\n\n\t@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@";
cout<<"\n\n\tPlease Enter Your Choice (1-7): ";
cin>>ch;
system("cls");
switch(ch)
{
case '1': write_patient(); break;
case '2': display_fromDate(char n); break;
case '3': cout<<"\n\n\tPlease Enter Patient's Contact Number: "; cin>>num;
display_sp(num); break;
case '4': cout<<"\n\n\tPlease Enter Patient's Contact Number: "; cin>>num;
modify_patient(num);break;
case '5': cout<<"\n\n\tPlease Enter Patient's Contact Number: "; cin>>num;
delete_patient(num);break;
case '6' : class_result(); break;
case '7': exit(0);;
default: cout<<"\a";
}
}while(ch!='7');
return 0;
}
答案 0 :(得分：0)
这可能无法解决您的问题，但可以提供帮助 （对于Downvoters：这太大了，不适合评论。另外，请在downvoting时发表评论。）
一些基础：
struct Time
{
unsigned int hours;
unsigned int minutes;
unsigned int seconds;
};
struct Date
{
unsigned int day;
unsigned int month;
unsigned int year;
};
建立时间和日期结构后，患者结构现在看起来像：
class Patient
{
public:
unsigned int contact_num;
std::string name;
std::string trtype;
Date booking_date;
Time booking_time;
};
要使日期具有可比性，您可以添加一些方法：
bool operator==(const Date& d)
{
return (year == d.year) && (month == d.month) && (day == d.day);
}
bool operator< (const Date& d)
{
if (year == d.year)
{
if (month == d.month)
{
return day < d.day;
}
else
{
return month < d.month;
}
}
return year < d.year;
}
通过这种方式，您可以为患者编写一些订购（比较）功能：
bool Order_By_Date(const Patient& p1, const Patient& p2)
{
return p1.booking_date < p2.booking_date;
}
如果你有Patient的向量，你可以通过使用以下方式订购（排序）它们：
std::vector<Patient> database;
//...
std::sort(database.begin(), database.end(), Order_By_Date);
这些概念同样适用于Time结构和预订时间。
高级排序功能（例如按名称，按日期）留作OP的练习。
STL搜索算法可以与排序或比较功能一起使用，类似于上面的std::sort功能。
按日期向find人提出：
static Date search_key =
{
.year = 2016;
.month = 01;
.day = 22;
};
bool Find_By_Date(const Person& p)
{
return p.booking_date == search_key;
}
std::vector<patients>::iterator iter =
std::find(database.begin(), database.end(),
search_key,
Find_By_Date);
if (iter != database.end())
{
cout << "Person found: " << iter->name << "\n";
}
我建议您查看其他std搜索功能，例如lower_bound。
如果这些都不够，你可以随时自己编写。