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BHHH

This C++ program defines a student class with attributes like ID, name, grades, percentage and letter grade. It includes functions to get and display student data, calculate grades, and read/write to a binary student data file. The main functions allow the user to add, display, search, modify and delete student records from the file.

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Omkar Sb
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87 views

BHHH

This C++ program defines a student class with attributes like ID, name, grades, percentage and letter grade. It includes functions to get and display student data, calculate grades, and read/write to a binary student data file. The main functions allow the user to add, display, search, modify and delete student records from the file.

Uploaded by

Omkar Sb
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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#include<iostream>

#include<fstream>
#include<iomanip>

using namespace std;

class student
{
int idnum;
char name[50];
int physics, chemistry, mathematics, english, comscience;
double per;
char grade;
void calculate();
public:
void getdata();
void showdata() const;
void show_tabular() const;
int getIDNum() const;
};

void student::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 student::getdata()
{
cout<<"\nEnter The ID number of the student ";
cin>>idnum;
cout<<"\n\nEnter student's Name: ";
cin.ignore();
cin.getline(name,50);
cout<<"\nEnter student's physics grade: ";
cin>>physics;
cout<<"\nEnter student's chemistry grade: ";
cin>>chemistry;
cout<<"\nEnter student's mathematics grade: ";
cin>>mathematics;
cout<<"\nEnter student's english grade: ";
cin>>english;
cout<<"\nEnter student's computer science grade: ";
cin>>comscience;
calculate();
}

void student::showdata() const


{
cout<<"\nID Number: "<<idnum;
cout<<"\nName: "<<name;
cout<<"\nPhysics: "<<physics;
cout<<"\nChemistry: "<<chemistry;
cout<<"\nMathematics: "<<mathematics;
cout<<"\nEnglish: "<<english;
cout<<"\nComputer Science: "<<comscience;
cout<<"\nPercentage: "<<per;
cout<<"\nLetter Grade: "<<grade;
}

void student::show_tabular() const


{
cout<<idnum<<setw(6)<<"
"<<name<<setw(10)<<physics<<setw(4)<<chemistry<<setw(4)<<mathematics<<setw(4)
<<english<<setw(4)<<comscience<<setw(8)<<per<<setw(6)<<grade<<endl;
}
int student::getIDNum() const
{
return idnum;
}

void SaveStudent();
void displayAll();
void Searchdisplay(int);
void modifyStudent(int);
void deleteStudent(int);
void DisplayClassResult();
void DisplayResult();

void write_student()
{
student st;
ofstream outFile;
outFile.open("student.dat",ios::binary|ios::app);
st.getdata();
outFile.write(reinterpret_cast<char *> (&st), sizeof(student));
outFile.close();
cout<<"\n\nStudent record Has Been Created ";
cin.ignore();
cin.get();
}

void display_all()
{
student st;
ifstream inFile;
inFile.open("student.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(student)))
{
st.showdata();
cout<<"\n\n====================================\n";
}
inFile.close();
cin.ignore();
cin.get();
}

void display_sp(int n)
{
student st;
ifstream inFile;
inFile.open("student.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(student)))
{
if(st.getIDNum()==n)
{
st.showdata();
flag=true;
}
}
inFile.close();
if(flag==false)
cout<<"\n\nrecord not exist";
cin.ignore();
cin.get();
}

void modify_student(int n)
{
bool found=false;
student st;
fstream File;
File.open("student.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(student));


if(st.getIDNum()==n)
{
st.showdata();
cout<<"\n\nPlease Enter The New Details of student"<<endl;
st.getdata();
int pos=(-1)*static_cast<int>(sizeof(st));
File.seekp(pos,ios::cur);
File.write(reinterpret_cast<char *> (&st), sizeof(student));
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_student(int n)
{
student st;
ifstream inFile;
inFile.open("student.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(student)))
{
if(st.getIDNum()!=n)
{
outFile.write(reinterpret_cast<char *> (&st), sizeof(student));
}
}
outFile.close();
inFile.close();
remove("student.dat");
rename("Temp.dat","student.dat");
cout<<"\n\n\tRecord Deleted ..";
cin.ignore();
cin.get();
}

void class_result()
{
student st;
ifstream inFile;
inFile.open("student.dat",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
cin.ignore();
cin.get();
return;
}
cout<<"\n\n\t\tALL STUDENTS

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