Create studentmanagement.cpp

studentmanagement.cpp

@@ -0,0 +1,243 @@
+#include<iostream>
+#include<fstream>
+#include<iomanip>
+using namespace std;
+
+// the class that stores data
+class student
+{
+int rollno;
+char name[50];
+int eng_marks, math_marks, sci_marks, lang2_marks, cs_marks;
+double average;
+char grade;
+
+public:
+void getdata();
+void showdata() const;
+void calculate();
+int retrollno() const;
+}; //class ends here
+
+void student::calculate()
+{
+average=(eng_marks+math_marks+sci_marks+lang2_marks+cs_marks)/5.0;
+if(average>=90)
+grade='A';
+else if(average>=75)
+grade='B';
+else if(average>=50)
+grade='C';
+else
+grade='F';
+}
+
+void student::getdata()
+{
+cout<<"\nEnter student's roll number: ";
+cin>>rollno;
+cout<<"\n\nEnter student name: ";
+cin.ignore();
+cin.getline(name,50);
+cout<<"\nAll marks should be out of 100";
+cout<<"\nEnter marks in English: ";
+cin>>eng_marks;
+cout<<"\nEnter marks in Math:  ";
+cin>>math_marks;
+cout<<"\nEnter marks in Science:  ";
+cin>>sci_marks;
+cout<<"\nEnter marks in 2nd language:  ";
+cin>>lang2_marks;
+cout<<"\nEnter marks in Computer science:  ";
+cin>>cs_marks;
+calculate();
+}
+void student::showdata() const
+{
+cout<<"\nRoll number of student : "<<rollno;
+cout<<"\nName of student : "<<name;
+cout<<"\nEnglish : "<<eng_marks;
+cout<<"\nMaths : "<<math_marks;
+cout<<"\nScience : "<<sci_marks;
+cout<<"\nLanguage2 : "<<lang2_marks;
+cout<<"\nComputer Science :"<<cs_marks;
+cout<<"\nAverage Marks :"<<average;
+cout<<"\nGrade of student is :"<<grade;
+}
+int  student::retrollno() const
+{
+return rollno;
+}
+//function declaration
+void create_student();
+void display_sp(int);//display particular record
+void display_all(); // display all records
+void delete_student(int);//delete particular record
+void change_student(int);//edit particular record
+//MAIN
+int main()
+{
+char ch;
+cout<<setprecision(2); 
+do
+{
+char ch;
+int num;
+system("cls");
+cout<<"\n\n\n\tMENU";
+cout<<"\n\n\t1.Create student record";
+cout<<"\n\n\t2. Search student record";
+cout<<"\n\n\t3. Display all students records ";
+cout<<"\n\n\t4.Delete student record";
+cout<<"\n\n\t5.Modify student record";
+cout<<"\n\n\t6.Exit";
+cout<<"\n\n\What is your Choice (1/2/3/4/5/6) ";
+cin>>ch;
+system("cls");
+switch(ch)
+{
+case '1': create_student(); break;
+case '2': cout<<"\n\n\tEnter The roll number "; 
+cin>>num;
+display_sp(num); break;
+case '3': display_all(); break;
+case '4': cout<<"\n\n\tEnter The roll number: "; 
+cin>>num;
+delete_student(num);break;
+case '5': cout<<"\n\n\tEnter The roll number "; cin>>num;
+change_student(num);break;
+case '6': cout<<"Exiting, Thank you!";exit(0);
+}
+}while(ch!='6');
+return 0;
+}
+//write student details to file
+void create_student()
+{
+student stud;
+ofstream oFile;
+oFile.open("student.dat",ios::binary|ios::app);
+stud.getdata();
+oFile.write(reinterpret_cast<char *> (&stud), sizeof(student));
+oFile.close();
+     cout<<"\n\nStudent record Has Been Created ";
+cin.ignore();
+cin.get();
+}
+// read file records
+void display_all()
+{
+student stud;
+ifstream inFile;
+inFile.open("student.dat",ios::binary);
+if(!inFile)
+{
+cout<<"File could not be opened !! Press any Key to exit";
+cin.ignore();
+cin.get();
+return;
+}
+cout<<"\n\n\n\t\tDISPLAYING ALL RECORDS\n\n";
+while(inFile.read(reinterpret_cast<char *> (&stud), sizeof(student)))
+{
+st.showdata();
+cout<<"\n\n====================================\n";
+}
+inFile.close();
+cin.ignore();
+cin.get();
+}
+//read specific record based on roll number
+void display_sp(int n)
+{
+student stud;
+ifstream iFile;
+iFile.open("student.dat",ios::binary);
+if(!iFile)
+{
+cout<<"File could not be opened... Press any Key to exit";
+cin.ignore();
+cin.get();
+return;
+}
+bool flag=false;
+while(iFile.read(reinterpret_cast<char *> (&stud), sizeof(student)))
+{
+if(stud.retrollno()==n)
+{
+  stud.showdata();
+flag=true;
+}
+}
+iFile.close();
+if(flag==false)
+cout<<"\n\nrecord does not exist";
+cin.ignore();
+cin.get();
+}
+// modify record for specified roll number
+void change_student(int n)
+{
+bool found=false;
+student stud;
+fstream fl;
+fl.open("student.dat",ios::binary|ios::in|ios::out);
+if(!fl)
+{
+cout<<"File could not be opened. Press any Key to exit...";
+cin.ignore();
+cin.get();
+return;
+}
+     while(!fl.eof() && found==false)
+{
+fl.read(reinterpret_cast<char *> (&stud), sizeof(student));
+if(stud.retrollno()==n)
+{
+stud.showdata();
+cout<<"\n\Enter new student details:"<<endl;
+stud.getdata();
+    int pos=(-1)*static_cast<int>(sizeof(stud));
+    fl.seekp(pos,ios::cur);
+    fl.write(reinterpret_cast<char *> (&stud), 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();
+}
+//delete record with particular roll number
+void delete_student(int n)
+{
+student stud;
+ifstream iFile;
+iFile.open("student.dat",ios::binary);
+if(!iFile)
+{
+cout<<"File could not be opened... Press any Key to exit...";
+cin.ignore();
+cin.get();
+return;
+}
+ofstream oFile;
+oFile.open("Temp.dat",ios::out);
+iFile.seekg(0,ios::beg);
+while(iFile.read(reinterpret_cast<char *> (&stud), sizeof(student)))
+{
+if(stud.retrollno()!=n)
+{
+oFile.write(reinterpret_cast<char *> (&stud), sizeof(student));
+}
+}
+oFile.close();
+iFile.close();
+remove("student.dat");
+rename("Temp.dat","student.dat");
+cout<<"\n\n\tRecord Deleted ..";
+cin.ignore();
+cin.get();
+}