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main.cpp

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+#include <iostream>
+#include <fstream>
+#include <conio.h>
+#include <stdlib.h>
+#include <string.h>
+
+using namespace std;
+
+class Student{
+int roll;
+char name[25];
+float marks;
+
+
+
+
+
+void getdata()
+{
+cout<<"\n\nEnter Roll:";
+cin>>roll;
+
+cout<<"\n\nEnter Name:";
+cin>>name;
+
+cout<<"\n\nEnter Marks:";
+cin>>marks;
+}
+
+void putdata()
+{
+    cout<<"\n\t"<<roll<<"\t"<<name<<"\t"<<marks;
+}
+
+public:
+    void modify();
+    int getrno()
+    {
+    return roll;
+    }
+    void Display()
+    {
+        fstream f;
+        Student Stu;
+        f.open("Student.dat",ios::in|ios::binary);
+        cout<<"\n\tRoll\tName\tMarks\n";
+        while((f.read((char*)&Stu,sizeof(Stu)))!=NULL)
+            Stu.putdata();
+
+        f.close();
+        }
+    void AddRecord()
+    {
+        fstream f;
+        Student Stu;
+
+        f.open("Student.dat",ios::app|ios::binary);
+
+        Stu.getdata();
+
+        f.write((char*) &Stu, sizeof(Stu));
+
+        f.close();
+    }
+}stud1,stud;
+
+void Student::modify()
+{
+    cout<<"Rollno:"<<roll<<"\n";
+    cout<<"Name:"<<name<<"\tMarks:"<<marks<<"\n";
+    cout<<"Enter new details.\n";
+    char nam[20]="";
+    float mks;
+    cout<<"New name:(Enter '.' to retain old one)";
+    cin>>nam;
+    cout<<"New marks:(Press -1 to retain old one)";
+    cin>>mks;
+    if(strcmp(nam,".")!=0){strcpy(name,nam);}
+    if(mks!=-1)marks=mks;
+    cout<<endl<<marks;
+}
+
+void deleter()
+{
+    ifstream fd;
+    ofstream ft;
+    fd.open("Student.dat",ios::binary);
+    ft.open("temp.dat",ios::binary);
+    int flagd=0;
+    //char conf='y';
+    Student st;
+    cout<<"Enter student rollno to delete:";
+    int rno;
+    cin>>rno;
+    while((fd.read((char*)&st,sizeof(st)))!=NULL)
+    {
+        if(st.getrno()!=rno)
+        {
+            flagd=1;
+            ft.write((char*)&st,sizeof(st));
+        }
+    }
+    fd.close();
+    ft.close();
+    if(flagd==0)cout<<"\nSpecified student not found :";
+    remove("Student.dat");
+    rename("temp.dat","Student.dat");
+    remove("temp.dat");
+    cout<<"\nProcess complete";
+}
+
+
+int main()
+{
+    int found=0;
+    Student S;
+    int op;
+    fstream fio;
+
+    do
+    {
+        cout<<"\n1.Add\n";
+        cout<<"2.Display\n";
+        cout<<"3.Edit\n";
+        cout<<"4.Delete\n";
+        cout<<"5.Exit\n";
+        cout<<"Enter the options\n";
+        cin>>op;
+        switch(op){
+        case 1:S.AddRecord();break;
+        case 2:S.Display();break;
+        case 3: fio.open("Student.dat",ios::in|ios::out);
+                int rno;
+                long pos;
+                //char found='f';
+
+                cout<<"Enter rollno of student whose record is to be modified:";
+                cin>>rno;
+                cout<<"Beginning"<<fio.tellg();
+                system("pause");
+                while(!fio.eof())
+                {
+                    pos=fio.tellg();
+                    cout<<"Position"<<pos<<endl;
+                    fio.read((char*)&stud1,sizeof(stud1));
+                    if(stud1.getrno()==rno)
+                    {
+                        cout<<"match"<<endl;
+                        stud1.modify();
+                        fio.seekg(pos);
+                        fio.write((char*)&stud1,sizeof(stud1));
+                        fio.close();
+                        found=1;
+                        break;
+                    }}
+                    //if (found==0)cout<<"\nRecord not found in the file..!!\n";
+                break;
+        case 4: deleter();break;
+        case 5:exit(0);
+        }
+    }while(1);
+    cout<<"\nData written succesfully...";
+    return 0;
+}