files added

lp2/README.md

@@ -0,0 +1,134 @@
+Enter your choice
+
+1.Insert
+
+2.Search and Modify
+
+3.Exit
+
+1
+
+Enter URN => 1
+
+Enter name => 1
+
+Enter Sem => 1
+
+Enter your choice
+
+1.Insert
+
+2.Search and Modify
+
+3.Exit
+
+1
+
+Enter URN => 2
+
+Enter name => 2
+
+Enter Sem => 2
+
+Enter your choice
+
+1.Insert
+
+2.Search and Modify
+
+3.Exit
+
+2
+
+Enter the URN to be searched => 1
+
+Record found
+
+Student	 URN1
+
+
+	 Name:1
+
+	 Sem:1Enter your choice
+
+URN => 1
+
+1.Name => 1
+
+2.Sem => 1
+
+3.Exit
+
+Enter your choice(1,2,3)1
+
+Enter new name => Avinash
+
+Enter your choice
+
+URN => 1
+
+1.Name => Avinash
+
+2.Sem => 1
+
+3.Exit
+
+Enter your choice(1,2,3)3
+
+Enter your choice
+
+1.Insert
+
+2.Search and Modify
+
+3.Exit
+
+1
+
+Enter URN => 16
+
+Enter name => Avi
+
+Enter Sem => 6
+
+Enter your choice
+
+1.Insert
+
+2.Search and Modify
+
+3.Exit
+
+2
+
+Enter the URN to be searched => 16
+
+Record found
+
+Student	 URN16
+
+	 Name:Avi
+
+	 Sem:6Enter your choice
+
+URN => 16
+
+1.Name => Avi
+
+2.Sem => 6
+
+3.Exit
+
+Enter your choice(1,2,3)3
+
+Enter your choice
+
+1.Insert
+
+2.Search and Modify
+
+3.Exit
+
+3
+
+

lp2/p2.cpp

@@ -0,0 +1,179 @@
+#include<iostream>
+#include<string>
+#include<fstream>
+#include<cstring>
+using namespace std;
+
+void search();
+
+class Student
+{
+	public:
+		string urn;
+		string name;
+		string sem;
+		string Buf;
+		char buf[46];
+		int pack();
+		void write_f(fstream &);
+		void unpack();
+		void print(ostream &);
+		void read_f(fstream &);
+};
+
+int Student::pack()
+{
+
+	Buf=urn+"|"+name+"|"+sem+"|";
+	if(Buf.length()>45)
+		return 0;
+	while(Buf.length()<45)
+		Buf+="_";
+	Buf+="\0";
+	return 1;
+}
+
+void Student::write_f(fstream &fp)
+{
+	fp.flush();
+	fp<<Buf<<'\n';
+	fp.flush();
+}
+
+void Student::print(ostream & stream)
+{
+	stream<<"Student"<<"\t URN"<<urn<<"\n"<<"\t Name:"<<name<<"\n\t Sem:"<<sem;
+}
+void Student::unpack()
+{
+	char stg[100];
+	int pos=0,count=0,k;
+	while(count<3)
+	{
+		k=0;
+		for(int i=pos;i<strlen(buf);i++,k++)
+		{
+			stg[k]=buf[i];
+			pos++;
+			if(buf[i]=='|')
+				break;
+		}
+		stg[k]='\0';
+		count++;
+		if(count==1)urn=stg;
+		if(count==2)name=stg;
+		if(count==3)sem=stg;
+	}
+}
+
+void Student:: read_f(fstream &fp)
+{
+	char sg[55];
+	fp.getline(buf,46,'_');
+	fp.getline(sg,50,'\n');
+}
+
+int main()
+{
+	int ch,x;
+	Student s;
+	fstream fp;
+	do
+	{
+		cout<<"Enter your choice\n";
+		cout<<"1.Insert\n2.Search and Modify\n3.Exit\n";
+		cin>>ch;
+		switch(ch)
+		{
+			case 1:	fp.open("in.txt",ios::out | ios::app);
+				cout<<"Enter URN => ";
+				cin>>s.urn;
+				cout<<"Enter name => ";
+				cin>>s.name;
+				cout<<"Enter Sem => ";
+				cin>>s.sem;
+				int k ;
+				k = s.pack();
+				if(k==0)
+				{
+					cout<<"Invalid data\n";
+				}
+				else
+					s.write_f(fp);
+				fp.close();
+				break;
+			case 2:	search();
+				break;
+			case 3: exit(1);
+		}
+	}
+	while(ch<=3);
+
+	return 0;
+}
+
+void search()
+{
+	int c=0,choice;
+	string usn;
+	Student s[1100];
+	fstream fp1;
+	fp1.open("in.txt",ios::in);
+	cout<<"Enter the URN to be searched => ";
+	cin>>usn;
+	int cnt=0;
+	int i=0;
+	while(fp1)
+	{
+		s[i].read_f(fp1);
+		s[i].unpack();
+		i++;
+	}
+	fp1.close();
+	cnt=i-1;
+	for(i=0;i<cnt;i++)
+	{
+		if(s[i].urn==usn)
+		{
+			c++;
+			break;
+		}
+	}
+	if(c==0)
+	{
+		cout<<"Record not found\n";
+		return;
+	}
+	else
+	{
+		cout<<"Record found\n";
+		s[i].print(cout);
+		do
+		{
+			cout<<"Enter your choice\n";
+			cout<<"URN => "<<s[i].urn<<"\n";
+			cout<<"1.Name => "<<s[i].name<<"\n2.Sem => "<<s[i].sem<<"\n3.Exit\n";
+			cout<<"Enter your choice(1,2,3)";
+			cin>>choice;
+			switch(choice)
+			{
+				case 1:	cout<<"Enter new name => ";
+					cin>>s[i].name;
+					break;
+				case 2:	cout<<"Enter new sem => ";
+					cin>>s[i].sem;
+					break;
+				case 3: break;
+				default: cout<<"Wrong choice, please enter a valid choice\n";
+			}
+		}
+		while(choice!=3);
+		fp1.open("in.txt",ios::out);
+		for(i=0;i<cnt;i++)
+		{
+			s[i].pack();
+			s[i].write_f(fp1);
+		}
+		fp1.close();
+	}
+}