 #include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<fstream>
#include<string.h>
#include<conio.h>
using namespace std;
class Lib
{
public:
char bookname[100],auname[50],sc[20],sc1[50];
int q,B,p;
Lib()
{
strcpy(bookname,"NO Book Name");
strcpy(auname,"No Author Name");
strcpy(sc,"No Book ID");
strcpy(sc1,"No Book ID");
q=0;
B=0;
p=0;
}
void get();
void student();
void pass();
void librarian();
void password();
void getdata();
void show(int);
void booklist(int);
void modify();
void see(int);
int branch(int);
void issue();
void der(char[],int,int);
void fine(int,int,int,int,int,int);
};
void Lib::getdata()
{
int i;
fflush(stdin);
cout<<"\n\t\tEnter the details :-\n";
cout<<"\n\t\tEnter Book's Name : ";
cin.getline(bookname,100);
for(i=0;bookname[i]!='\0';i++)
{
if(bookname[i]>='a'&&bookname[i]<='z')
bookname[i]-=32;
}
cout<<"\n\t\tEnter Author's Name : ";
cin.getline(auname,50);
cout<<"\n\t\tEnter Publication name : ";
cin.getline(sc1,50);
cout<<"\n\t\tEnter Book's ID : ";
cin.getline(sc,20);
cout<<"\n\t\tEnter Book's Price : ";
cin>>p;
cout<<"\n\t\tEnter Book's Quantity : ";
cin>>q;
}
void Lib::show(int i)
{
cout<<"\n\t\tBook Name : "<<bookname<<endl;
cout<<"\n\t\tBook's Author Name : "<<auname<<endl;
cout<<"\n\t\tBook's ID : "<<sc<<endl;
cout<<"\n\t\tBook's Publication : "<<sc1<<endl;
if(i==2)
{
cout<<"\n\t\tBook's Price : "<<p<<endl;
cout<<"\n\t\tBook's Quantity : "<<q<<endl;
}
}
void Lib::booklist(int i)
{
int b,r=0;
system("cls");
b=branch(i);
system("cls");
ifstream intf("Booksdata.txt",ios::binary);
if(!intf)
cout<<"\n\t\tFile Not Found.";
else
{
cout<<"\n\t    ************ Book List ************ \n\n";
intf.read((char*)this,sizeof(*this));
while(!intf.eof())
{
if(b==B)
{
if(q==0 && i==1)
{
}
else
{
r++;
cout<<"\n\t\t********** "<<r<<". ********** \n";
show(i);
}
}
intf.read((char*)this,sizeof(*this));
}
}
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
if(i==1)
student();
else
librarian();
}
void Lib::modify()
{
char ch,st1[100];
int i=0,b,cont=0;
system("cls");
cout<<"\n\t\t>>Please Choose one option :-\n";
cout<<"\n\t\t1.Modification In Current Books\n\n\t\t2.Add New Book\n\n\t\t3.Delete A Book\n\n\t\t4.Go back\n";
cout<<"\n\n\t\tEnter your choice : ";
cin>>i;
if(i==1)
{
system("cls");
b=branch(2);
ifstream intf1("Booksdata.txt",ios::binary);
if(!intf1)
{
cout<<"\n\t\tFile Not Found\n";
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
librarian();
}
intf1.close();
system("cls");
cout<<"\n\t\tPlease Choose One Option :-\n";
cout<<"\n\t\t1.Search By Book Name\n\n\t\t2.Search By Book's ID\n";
cout<<"\n\t\tEnter Your Choice : ";
cin>>i;
fflush(stdin);
if(i==1)
{
system("cls");
cout<<"\n\t\tEnter Book Name : ";
cin.getline(st1,100);
system("cls");
fstream intf("Booksdata.txt",ios::in|ios::out|ios::ate|ios::binary);
intf.seekg(0);
intf.read((char*)this,sizeof(*this));
while(!intf.eof())
{
for(i=0;b==B&&bookname[i]!='\0'&&st1[i]!='\0'&&(st1[i]==bookname[i]||st1[i]==bookname[i]+32);i++);
if(bookname[i]=='\0'&&st1[i]=='\0')
{
cont++;
getdata();
intf.seekp(intf.tellp()-sizeof(*this));
intf.write((char*)this,sizeof(*this));
break;
}
intf.read((char*)this,sizeof(*this));
}
intf.close();
}
else if(i==2)
{
cout<<"\n\t\tEnter Book's ID : ";
cin.getline(st1,100);
system("cls");
fstream intf("Booksdata.txt",ios::in|ios::out|ios::ate|ios::binary);
intf.seekg(0);
intf.read((char*)this,sizeof(*this));
while(!intf.eof())
{
for(i=0;b==B&&sc[i]!='\0'&&st1[i]!='\0'&&st1[i]==sc[i];i++);
if(sc[i]=='\0'&&st1[i]=='\0')
{
cont++;
getdata();
intf.seekp(intf.tellp()-sizeof(*this));
intf.write((char*)this,sizeof(*this));
break;
}
intf.read((char*)this,sizeof(*this));
}
intf.close();
}
else
{
cout<<"\n\t\tIncorrect Input.....:(\n";
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
modify();
}
if(cont==0)
{
cout<<"\n\t\tBook Not Found.\n";
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
modify();
}
else
cout<<"\n\t\tUpdate Successful.\n";
}
else if(i==2)
{
system("cls");
B=branch(2);
system("cls");
getdata();
ofstream outf("Booksdata.txt",ios::app|ios::binary);
outf.write((char*)this,sizeof(*this));
outf.close();
cout<<"\n\t\tBook added Successfully.\n";
}
else if(i==3)
{
system("cls");
b=branch(2);
ifstream intf1("Booksdata.txt",ios::binary);
if(!intf1)
{
cout<<"\n\t\tFile Not Found\n";
cout<<"\n\t\tPress any key to continue.....";
getch();
intf1.close();
system("cls");
librarian();
}
intf1.close();
system("cls");
cout<<"\n\t\tPlease Choose One Option for deletion:-\n";
cout<<"\n\t\t1.By Book Name\n\n\t\t2.By Book's ID\n";
cout<<"\n\t\tEnter Your Choice : ";
cin>>i;
fflush(stdin);
if(i==1)
{
system("cls");
cout<<"\n\t\tEnter Book Name : ";
cin.getline(st1,100);
ofstream outf("temp.txt",ios::app|ios::binary);
ifstream intf("Booksdata.txt",ios::binary);
intf.read((char*)this,sizeof(*this));
while(!intf.eof())
{
for(i=0;b==B&&bookname[i]!='\0'&&st1[i]!='\0'&&(st1[i]==bookname[i]||st1[i]==bookname[i]+32);i++);
if(bookname[i]=='\0'&&st1[i]=='\0')
{
cont++;
intf.read((char*)this,sizeof(*this));
}
else
{
outf.write((char*)this,sizeof(*this));
intf.read((char*)this,sizeof(*this));
}
}
intf.close();
outf.close();
remove("Booksdata.txt");
rename("temp.txt","Booksdata.txt");
}
else if(i==2)
{
cout<<"\n\t\tEnter Book's ID : ";
cin.getline(st1,100);
ofstream outf("temp.txt",ios::app|ios::binary);
ifstream intf("Booksdata.txt",ios::binary);
intf.read((char*)this,sizeof(*this));
while(!intf.eof())
{
for(i=0;b==B&&sc[i]!='\0'&&st1[i]!='\0'&&st1[i]==sc[i];i++);
if(sc[i]=='\0'&&st1[i]=='\0')
{
cont++;
intf.read((char*)this,sizeof(*this));
}
else
{
outf.write((char*)this,sizeof(*this));
intf.read((char*)this,sizeof(*this));
}
}
outf.close();
intf.close();
remove("Booksdata.txt");
rename("temp.txt","Booksdata.txt");
}
else
{
cout<<"\n\t\tIncorrect Input.....:(\n";
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
modify();
}
if(cont==0)
{
cout<<"\n\t\tBook Not Found.\n";
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
modify();
}
else
cout<<"\n\t\tDeletion Successful.\n";
}
else if(i==4)
{
system("cls");
librarian();
}
else
{
cout<<"\n\t\tWrong Input.\n";
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
modify();
}
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
librarian();
}
int Lib::branch(int x)
{
int i;
cout<<"\n\t\t>>Please Choose one Branch :-\n";
cout<<"\n\t\t1.Class 12th\n\n\t\t2.CS\n\n\t\t3.EC\n\n\t\t4.CIVIL\n\n\t\t5.MECHANICAL\n\n\t\t6.1ST YEAR\n\n\t\t7.Go to menu\n";
cout<<"\n\t\tEnter youur choice : ";
cin>>i;
switch(i)
{
case 1: return 1;
break;
case 2: return 2;
break;
case 3: return 3;
break;
case 4: return 4;
break;
case 5: return 5;
break;
case 6: return 6;
break;
case 7: system("cls");
if(x==1)
student();
else
librarian();
default : cout<<"\n\t\tPlease enter correct option :(";
getch();
system("cls");
branch(x);
}
}
void Lib::see(int x)
{
int i,b,cont=0;
char ch[100];
system("cls");
b=branch(x);
ifstream intf("Booksdata.txt",ios::binary);
if(!intf)
{
cout<<"\n\t\tFile Not Found.\n";
cout<<"\n\t\t->Press any key to continue.....";
getch();
system("cls");
if(x==1)
student();
else
librarian();
}
system("cls");
cout<<"\n\t\tPlease Choose one option :-\n";
cout<<"\n\t\t1.Search By Name\n\n\t\t2.Search By Book's ID\n";
cout<<"\n\t\tEnter Your Choice : ";
cin>>i;
fflush(stdin);
intf.read((char*)this,sizeof(*this));
if(i==1)
{
cout<<"\n\t\tEnter Book's Name : ";
cin.getline(ch,100);
system("cls");
while(!intf.eof())
{
for(i=0;b==B&&q!=0&&bookname[i]!='\0'&&ch[i]!='\0'&&(ch[i]==bookname[i]||ch[i]==bookname[i]+32);i++);
if(bookname[i]=='\0'&&ch[i]=='\0')
{
cout<<"\n\t\tBook Found :-\n";
show(x);
cont++;
break;
}
intf.read((char*)this,sizeof(*this));
}
}
else if(i==2)
{
cout<<"\n\t\tEnter Book's ID : ";
cin.getline(ch,100);
system("cls");
while(!intf.eof())
{
for(i=0;b==B&&q!=0&&sc[i]!='\0'&&ch[i]!='\0'&&ch[i]==sc[i];i++);
if(sc[i]=='\0'&&ch[i]=='\0')
{
cout<<"\n\t\tBook Found :-\n";
show(x);
cont++;
break;
}
intf.read((char*)this,sizeof(*this));
}
}
else
{
cont++;
cout<<"\n\t\tPlease enter correct option :(";
getch();
system("cls");
see(x);
}
intf.close();
if(cont==0)
cout<<"\n\t\tThis Book is not available :( \n";
cout<<"\n\t\tPress any key to continue.....";
getch();
system("cls");
if(x==1)
student();
else
librarian();
}
void Lib::issue()
{
char st[50],st1[20];
int b,i,j,d,m,y,dd,mm,yy,cont=0;
system("cls");
cout<<"\n\t\t->Please Choose one option :-\n";
cout<<"\n\t\t1.Issue Book\n\n\t\t2.View Issued Book\n\n\t\t3.Search student who isuued books\n\n\t\t4.Reissue Book\n\n\t\t5.Return Book\n\n\t\t6.Go back to menu\n\n\t\tEnter Your Choice : ";
cin>>i;
fflush(stdin);
if(i==1)
{
system("cls");
b=branch(2);
system("cls");
fflush(stdin);
cout<<"\n\t\t->Please Enter Details :-\n";
cout<<"\n\t\tEnter Book Name : ";
cin.getline(bookname,100);
cout<<"\n\t\tEnter Book's ID : ";
cin.getline(sc,20);
//strcpy(st,sc);
der(sc,b,1);
cout<<"\n\t\tEnter Student Name : ";
cin.getline(auname,100);
cout<<"\n\t\tEnter Student's ID : ";
cin.getline(sc1,20);
cout<<"\n\t\tEnter date : ";
cin>>q>>B>>p;
ofstream outf("student.txt",ios::binary|ios::app);
outf.write((char*)this,sizeof(*this));
outf.close();
cout<<"\n\n\t\tIssue Successfully.\n";
}
else if(i==2)
{
ifstream intf("student.txt",ios::binary);
system("cls");
cout<<"\n\t\t->The Details are :-\n";
intf.read((char*)this,sizeof(*this));
i=0;
while(!intf.eof())
{
i++;
cout<<"\n\t\t********** "<<i<<". ********** \n";
cout<<"\n\t\tStudent Name : "<<auname<<"\n\t\t"<<"Student's ID : "<<sc1<<"\n\t\t"<<"Book Name : "<<bookname<<"\n\t\t"<<"Book's ID : "<<sc<<"\n\t\t"<<"Date : "<<q<<"/"<<B<<"/"<<p<<"\n";
intf.read((char*)this,sizeof(*this));
}
intf.close();
}
else if(i==3)
{
system("cls");
fflush(stdin);
cout<<"\n\t\t->Please Enter Details :-\n";
cout<<"\n\n\t\tEnter Student Name : ";
cin.getline(st,50);
cout<<"\n\n\t\tEnter Student's ID : ";
cin.getline(st1,20);
system("cls");
ifstream intf("student.txt",ios::binary);
intf.read((char*)this,sizeof(*this));
cont=0;
while(!intf.eof())
{
for(i=0;sc1[i]!='\0'&&st1[i]!='\0'&&st1[i]==sc1[i];i++);
if(sc1[i]=='\0'&&st1[i]=='\0')
{
cont++;
if(cont==1)
{
cout<<"\n\t\t->The Details are :-\n";
cout<<"\n\t\tStudent Name : "<<auname;
cout<<"\n\t\tStudent's ID : "<<sc1;
}
cout<<"\n\n\t\t******* "<<cont<<". Book details *******\n";
cout<<"\n\t\tBook Name : "<<bookname;
cout<<"\n\t\tBook's ID : "<<sc;
cout<<"\n\t\tDate : "<<q<<"/"<<B<<"/"<<p<<"\n";
}
intf.read((char*)this,sizeof(*this));
}
intf.close();
if(cont==0)
cout<<"\n\t\tNo record found.";
}
else if(i==4)
{
system("cls");
fflush(stdin);
cout<<"\n\t\t->Please Enter Details :-\n";
cout<<"\n\n\t\tEnter Student's ID : ";
cin.getline(st,50);
cout<<"\n\t\tEnter Book's ID : ";
cin.getline(st1,20);
fstream intf("student.txt",ios::in|ios::out|ios::ate|ios::binary);
intf.seekg(0);
intf.read((char*)this,sizeof(*this));
while(!intf.eof())
{
for(i=0;sc[i]!='\0'&&st1[i]!='\0'&&st1[i]==sc[i];i++);
for(j=0;sc1[j]!='\0'&&st[j]!='\0'&&st[j]==sc1[j];j++);
if(sc[i]=='\0'&&sc1[j]=='\0'&&st[j]=='\0'&&st1[i]=='\0')
{
d=q;
m=B;
y=p;
cout<<"\n\t\tEnter New Date : ";
cin>>q>>B>>p;
fine(d,m,y,q,B,p); //fn1
intf.seekp(intf.tellp()-sizeof(*this)); //fn3
intf.write((char*)this,sizeof(*this)); //fn5
cout<<"\n\n\t\tReissue successfully."; //fn3
break;
}
intf.read((char*)this,sizeof(*this));
}
intf.close();
}
else if(i==5)
{
system("cls");
b=branch(2);
system("cls");
fflush(stdin);
cout<<"\n\t\t->Please Enter Details :-\n";
cout<<"\n\t\tEnter Book's ID : ";
cin.getline(st1,20);
der(st1,b,2);
cout<<"\n\n\t\tEnter Student's ID : ";
cin.getline(st,20);
cout<<"\n\t\tEnter Present date : ";
cin>>d>>m>>y;
ofstream outf("temp.txt",ios::app|ios::binary);
ifstream intf("student.txt",ios::binary);
intf.read((char*)this,sizeof(*this));
while(!intf.eof())
{
for(i=0;sc[i]!='\0'&&st1[i]!='\0'&&st1[i]==sc[i];i++);
for(j=0;sc1[j]!='\0'&&st[j]!='\0'&&st[j]==sc1[j];j++);
if(sc[i]=='\0'&&sc1[j]=='\0'&&st[j]=='\0'&&st1[i]=='\0'&&cont==0)
{
cont++;
intf.read((char*)this,sizeof(*this));
fine(q,B,p,d,m,y);
cout<<"\n\t\tReturned successfully.";
}
else
{
outf.write((char*)this,sizeof(*this));
intf.read((char*)this,sizeof(*this));
}
}
intf.close();
outf.close();
getch();
remove("student.txt");
rename("temp.txt","student.txt");
}
else if(i==6)
{
system("cls");
librarian();
}
else
cout<<"\n\t\tWrong Input.\n";
cout<<"\n\n\t\tPress any key to continue.....";
getch();
system("cls");
librarian();
}
void Lib::fine(int d,int m,int y,int dd,int mm,int yy)
{
long int n1,n2;
int years,l,i;
const int monthDays[12] = {31, 28, 31, 30, 31, 30,31, 31, 30, 31, 30, 31};
n1 = y*365 + d;
for (i=0; i<m - 1; i++)
n1 += monthDays[i]; //fn1353
years = y;
if (m <= 2)
years--;
l= years / 4 - years / 100 + years / 400;
n1 += l;
n2 = yy*365 + dd;
for (i=0; i<mm - 1; i++)
n2 += monthDays[i];
years = yy;
if (m <= 2)
years--;
l= years / 4 - years / 100 + years / 400;
n2 += l;
n1=n2-n1;
n2=n1-15;
if(n2>0)
cout<<"\n\t\tThe Total Fine is : "<<n2;
}
void Lib::der(char st[],int b,int x)
{
int i,cont=0;
fstream intf("Booksdata.txt",ios::in|ios::out|ios::ate|ios::binary);
intf.seekg(0);
intf.read((char*)this,sizeof(*this));
while(!intf.eof())
{
for(i=0;b==B&&sc[i]!='\0'&&st[i]!='\0'&&st[i]==sc[i];i++);
if(sc[i]=='\0'&&st[i]=='\0')
{
cont++;
if(x==1)
{
q--;
}
else
{
q++;
}
intf.seekp(intf.tellp()-sizeof(*this));
intf.write((char*)this,sizeof(*this));
break;
}
intf.read((char*)this,sizeof(*this));
}
if(cont==0)
{
cout<<"\n\t\tBook not found.\n";
cout<<"\n\n\t\tPress any key to continue.....";
getch();
system("cls");
issue();
}
intf.close();
}
void Lib::get()
{
int i;
cout<<"\n\t*********** LIBRARY MANAGEMENT SYSTEM ***********\n"<<"\n\t\t\t    Learnprogramo <<LMS>> C++\n";
cout<<"\n\t\t>>Please Choose Any Option To login \n";
cout<<"\n\t\t1.Student\n\n\t\t2.Librarian\n\n\t\t3.Close Application\n";
cout<<"\n\t\tEnter your choice : ";
cin>>i;
if(i==1)
{
system("cls");
student();
}
else if(i==2)
pass();
else if(i==3)
exit(0);
else
{
cout<<"\n\t\tPlease enter correct option :(";
getch();
system("CLS");
get();
}
}
void Lib::student()
{
int i;
cout<<"\n\t************ WELCOME STUDENT ************\n";
cout<<"\n\t\t>>Please Choose One Option:\n";
cout<<"\n\t\t1.View BookList\n\n\t\t2.Search for a Book\n\n\t\t3.Go to main menu\n\n\t\t4.Close Application\n";
cout<<"\n\t\tEnter your choice : ";
cin>>i;
if(i==1)
booklist(1);
else if(i==2)
see(1);
else if(i==3)
{
system("cls");
get();
}
else if(i==4)
exit(0);
else
{
cout<<"\n\t\tPlease enter correct option :(";
getch();
system("cls");
student();
}
}
void Lib::pass()
{
int i=0;
char ch,st[21],ch1[21]={"learnprogramo"};
cout<<"\n\t\tEnter Password : ";
while(1)
{
ch=getch();
if(ch==13)
{
st[i]='\0';
break;
}
else if(ch==8&&i>0)
{
i--;
cout<<"\b \b";
}
else
{
cout<<"*";
st[i]=ch;
i++;
}
}
ifstream inf("password.txt");
inf>>ch1;
inf.close();
for(i=0;st[i]==ch1[i]&&st[i]!='\0'&&ch1[i]!='\0';i++);
if(st[i]=='\0'&&ch1[i]=='\0')
{
system("cls");
librarian();
}
else
{
cout<<"\n\n\t\tWrong Password.\n\n\t\ttry again.....\n";
getch();
system("cls");
get();
}
}
void Lib::librarian()
{
int i;
cout<<"\n\t************ WELCOME LIBRARIAN ************\n";
cout<<"\n\t\t>>Please Choose One Option:\n";
cout<<"\n\t\t1.View BookList\n\n\t\t2.Search for a Book\n\n\t\t3.Modify/Add Book\n\n\t\t4.Issue Book\n\n\t\t5.Go to main menu\n\n\t\t6.Change Password\n\n\t\t7.Close Application\n";
cout<<"\n\t\tEnter your choice : ";
cin>>i;
switch(i)
{
case 1:booklist(2);
break;
case 2:see(2);
break;
case 3:modify();
break;
case 4:issue();
break;
case 5:system("cls");
get();
break;
case 6:password();
break;
case 7:exit(0);
default:cout<<"\n\t\tPlease enter correct option :(";
getch();
system("cls");
librarian();
}
}
void Lib::password()
{
int i=0,j=0;
char ch,st[21],ch1[21]={"learnprogramo"};
system("cls");
cout<<"\n\n\t\tEnter Old Password : ";
while(1)
{
ch=getch();
if(ch==13)
{
st[i]='\0';
break;
}
else if(ch==8&&i>0)
{
i--;
cout<<"\b \b";
}
else
{
cout<<"*";
st[i]=ch;
i++;
}
}
ifstream intf("password.txt");
intf>>ch1;
intf.close();
for(i=0;st[i]==ch1[i]&&st[i]!='\0'&&ch1[i]!='\0';i++);
if(st[i]=='\0'&&ch1[i]=='\0')
{
system("cls");
cout<<"\n\t**The Password Should be less than 20 characters & don't use spaces**\n\n";
cout<<"\n\t\tEnter New Password : ";
fflush(stdin);
i=0;
while(1)
{
j++;
ch=getch();
if(ch==13)
{
for(i=0;st[i]!=' '&&st[i]!='\0';i++);
if(j>20 || st[i]==' ')
{
cout<<"\n\n\t\tYou did't follow the instruction \n\n\t\tPress any key for try again.....";
getch();
system("cls");
password();
librarian();
}
st[i]='\0';
break;
}
else if(ch==8&&i>0)
{
i--;
cout<<"\b \b";
}
else
{
cout<<"*";
st[i]=ch;
i++;
}
}
ofstream outf("password.txt");
outf<<st;
outf.close();
cout<<"\n\n\t\tYour Password has been changed Successfully.";
cout<<"\n\t\tPress any key to continue......";
getch();
system("cls");
librarian();
}
else
{
cout<<"\n\n\t\tPassword is incorrect.....\n";
cout<<"\n\t\tEnter 1 for retry or 2 for menu";
cin>>i;
if(i==1)
{
system("cls");
password();
}
else
{
system("cls");
librarian();
}
}
}
int main()
{
Lib obj;
obj.get();
getch();
return 0;
}

created 3 years ago by Raju Dan Charan

HTML Online Editor & Compiler

Write, Run & Share HTML code online using OneCompiler's HTML online Code editor for free. It's one of the robust, feature-rich online Code editor for HTML language, running on the latest version HTML5. Getting started with the OneCompiler's HTML compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as HTML. You can also specify the stylesheet information in styles.css tab and scripts information in scripts.js tab and start coding.

About HTML

HTML(Hyper Text Markup language) is the standard markup language for Web pages, was created by Berners-Lee in the year 1991. Almost every web page over internet might be using HTML.

Syntax help

Fundamentals

Any HTML document must start with document declaration <!DOCTYPE html>
HTML documents begin with <html> and ends with </html>
Headings are defined with <h1> to <h6> where <h1> is the highest important heading and <h6> is the least important sub-heading.
Paragrahs are defined in <p>..</p> tag.

Links are defined in <a> tag.

Example:

<a href="https://onecompiler.com/html">HTML online compiler</a>

Images are defined in <img> tag, where src attribute consists of image name.
Buttons are defined in <button>..</button> tag
Lists are defined in <ul> for unordered/bullet list and <ol> for ordered/number list, and the list items are defined in <li>.

HTML Elements and Attributes

HTML element is everything present from start tag to end tag.
The text present between start and end tag is called HTML element content.
Anything can be a tagname but it's preferred to put the meaningful title to the content present as tag name.
Do not forget the end tag.
Elements with no content are called empty elements.
Elements can have attributes which provides additional information about the element.
In the below example, href is an attribute and a is the tag name.
Example:
```
<a href="https://onecompiler.com/html">HTML online compiler</a>
```

CSS

CSS(cascading style sheets) describes how HTML elements will look on the web page like color, font-style, font-size, background color etc.

Example:

Below is a sample style sheet which displays heading in green and in Candara font with padding space of 25px.

body{
  padding: 25px;
}
.title {
	color: #228B22;
	font-family: Candara;
}

HTML Tables

HTML Tables are defined in <table> tag.
Table row should be defined in <tr> tag
Table header should be defined in <th> tag
Table data should be defined in <td> tag
Table caption should be defined in <caption> tag

HTML-Javascript

Javascript is used in HTML pages to make them more interactive.
<script> is the tag used to write scripts in HTML
You can either reference a external script or write script code in this tag.

Example

<script src="script.js"></script>