c++ project on cricket database system
DESCRIPTION
Fully EditedTRANSCRIPT
/* Infix to postfix conversion using stack*/
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
const int size = 50;
char infix[size], postfix[size], Stack[size];
int top = -1;
int precedence(char ch); //function to get precedence of operator
char Pop(); //function to pop an element from stack
char Topelement(); //function to return top element from stack without popping
void Push(char ch); //function to push an elemnt in the stack
int braces(char *); //function to match number of braces
int main()
{ clrscr();
char ele, elem, st[20];
int prep, pre, popped, j =0 ,chk = 0;
strcpy(postfix," ");
cout<<"ASSUMPTIoN: The infix expression contains single letter variables\n\t\t and single digit expression only. \n";
cout<<"Enter Infix Expression :\t ";
gets(infix);
chk = braces(infix);
if(chk!=0)
{ cout<<"Unbalanced no. of braces.. \n\t Extra";
cout<<(chk == 1 ? "right braces":"left braces")<<endl;
system("pause");
exit(1);
} for(int i = 0; infix[i]!='\0';i++)
{ if(infix[i]!='('&&infix[i]!='^'&&infix[i]!='*'&&infix[i]!='/'&&infix[i]!='+'&&infix[i]!='-')
postfix[j++]=infix[i];
else if(infix[i]=='(')
{ elem = infix[i];
Push(elem);
} else if(infix[i]==')')
{ while((popped = Pop())!= '(')
{ postfix[j++]=popped;
} }
else
{elem = infix[i];
pre = precedence(elem);//pre stores precedence of operator coming from infix expression
ele = Topelement();
prep = precedence(ele);//prep stores precedence of operator at the top of stack
if(pre>prep) Push(elem);
else
{ while(prep>=pre)
{ if(ele=='#') break;
popped = Pop();
ele = Topelement();
postfix[j++] = popped;
prep = precedence(ele);
}
Push(elem);
} } }
while((popped = Pop() )!= '#')
postfix[j++]= popped;
postfix[j++]= '\0';
cout<<"\nPostfix:"<<postfix<<endl;
getch();
return 0;
}
int precedence(char ch)
{ switch(ch)
{ case'^':return 5;
case'/':return 4;
case'*': return 4;
case'+':return 3;
case'-':return 3;
default : return 0;
} }
char Pop() //function to pop an element from Stack
{ char ret;
if(top!=-1)
{ ret = Stack[top];
top--;
return ret;
}
else
return '#'; }
char Topelement()//function to return top element from Stack withoutpopping
{ char ch;
if(top!=-1)
ch= Stack[top];
else
ch = '#';
return ch;
}
void Push(char ch)
{ if(top!=size-1)
{ top++;
Stack[top]= ch;
} }
int braces (char *s)
{ int leftbr,rightbr;
leftbr=rightbr=0;
for(int i = 0; s[i]; i++)
{ if(s[i]=='(')
leftbr++;
else
if(s[i]==')')
rightbr++;
} if(leftbr == rightbr)
return 0;
else if(leftbr<rightbr)
return 1;
else return -1;
}
OUTPUT
/* Wap to implement stack as a linked list */
#include<iostream.h>
#include<conio.h>
#include<process.h>
struct node {
int roll;
node* next;
}*top,*save,*ptr,*newptr,*np;
node *create(int a)
{ ptr=new node;
ptr->roll=a;
ptr->next=NULL;
return ptr;
}
void push(node *np)
{ if(top==NULL)
top=np;
else
{ save=top;
top=np;
np->next=save;
} }
void pop()
{ if(top==NULL)
cout<<"\n Underflow!!!!";
else
{ ptr=top;
top=top->next;
delete ptr;
} }
void display(node *np)
{ while(np!=NULL)
{ cout<<np->roll<<" -> ";
np=np->next;
} }
void main()
{ clrscr();
top=NULL;
int n,m;
char k,ch;
do { cout<<"\nChoose from the menu :\n"
<<"\n 1. Push."
<<"\n 2. Pop."
<<"\n 3. Display."
<<"\n 4. Quit."
<<"\n\nEnter your choice : ";
cin>>n;
switch(n)
{ case 1: k='y';
while(k=='y'||k=='Y')
{ cout<<"\n Enter element to be inserted .";
cin>>m;
newptr=create(m);
if(newptr==NULL)
cout<<"\n Cannot create !!!!";
push(newptr);
cout<<"\n The Stack formed is : ";
display(top);
cout<<"\n\n Want to enter again ?: ";
cin>>k;
}
break;
case 2: k='y';
while(k=='y'||k=='Y')
{ pop();
cout<<"\n The Stack formed is : \n\n";
display(top);
cout<<"\n\n Want to delete again ?: ";
cin>>k;
}
break;
case 3: cout<<"\n The Stack formed is : ";
display(top);
break;
case 4: exit(0);
break;
default: cout<<"\n Please enter desired keyword : ";
}
cout<<"\n Do you want to continue..? : ";
cin>>ch;
}while(ch=='y'||ch=='Y');
getch();
}
OUTPUT
/* Wap in c++ to implement Queue as a linked list */
#include<iostream.h>
#include<conio.h>
struct node {
int roll;
node* next;
}*front,*rear,*ptr,*newptr,*np;
node *create(int a)
{ ptr=new node;
ptr->roll=a;
ptr->next=NULL;
return ptr;
} void insert(node *np)
{ if(front==NULL)
front=rear=np;
else
{ rear->next=np;
rear=np;
} }
void delet()
{ if(front==NULL)
cout<<"\n Underflow!!!!";
else
{ ptr=front;
front=front->next;
delete ptr;
} }
void display(node *np)
{
while(np!=NULL)
{ cout<<np->roll<<"-> ";
np=np->next;
} }
void main()
{ clrscr();
front=rear=NULL;
int n,m;
char ans,ch;
do
{ cout<<"\nChoose from the menu : "
<<"\n 1) Insert."
<<"\n 2) Delete"
<<"\n 3) Display."
<<"\n\n Enter your choice : ";
cin>>n;
switch(n)
{ case 1: ans='y';
while(ans=='y'||ans=='Y')
{ cout<<"\n Enter element to be inserted .";
cin>>m;
newptr=create(m);
if(newptr==NULL)
cout<<"\n Cannot create !!!!";
insert(newptr);
cout<<"\n The Queue formed is : ";
display(front);
cout<<"\n Want to enter more nodes ?: ";
cin>>ans;
}
break;
case 2: ans='y';
while(ans=='y'||ans=='Y')
{
delet();
cout<<"\n Queue : ";
display(front);
cout<<"\n Want to delete more ?: ";
cin>>ans;
} break;
case 3: cout<<"\n Queue : ";
display(front);
break;
default: cout<<"\n You entered wrong choice...";
}
cout<<"\n Want to return to main menu ? : ";
cin>>ch;
}while(ch=='y'||ch=='Y');
getch();
}
OUTPUT
//Menu driven program to create a file,read a file,count the no. of records and search for a records
//header files used
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<string.h>
#include<fstream.h>
//class declaration
class floppy
{ public:
int floppy_id;
char name[20];
int size;
void getdata()
{ cout<<"Enter the floppy id ";
cin>>floppy_id;
cout<<"Enter the name of the floppy ";
gets(name);
cout<<"Enter the size of the floppy ";
cin>>size;
}
void display()
{
cout<<"Floppy Id ===>"<<floppy_id;
cout<<"\nFloppy Name ===>";
puts(name);
cout<<"Size ===>"<<size<<"\n";
}
}f1;
void create() //function to create a file
{
char c;
fstream file;
file.open("floppy.dat",ios::out|ios::binary);
do
{
f1.getdata();
file.write((char*)&f1,sizeof(f1));
cout<<"\nDo you want to enter another record?(y/n)"<<"\n";
cin>>c;
}while(c=='y');
file.close();
}
void showfile() //function to read a file
{
fstream file;
file.open("floppy.dat",ios::in|ios::binary);
while(file.read((char*)&f1,sizeof(f1)))
{
f1.display();
}
file.close();
}
void main()
{
fstream file;
char q;
int ch;
do
{clrscr();
cout<<"What do you want to do ?\n";
cout<<"1.Create a file\n";
cout<<"2.Read a file\n";
cout<<"3.Count the number of records\n";
cout<<"4.Search a floppy by name or id\n";
cout<<"Enter your choice ";
cin>>ch;
switch(ch)
{
case 1: create();
break;
case 2:
showfile();
break;
case 3: int r=0;
file.open("floppy.dat",ios::in);
while(file.read((char*)&f1,sizeof(f1))) //counting the total no. of records
{
++r;
};
file.close();
cout<<"No. of records= "<<r<<"\n";
break;
case 4: //case for searching a record by name or id
int w;
file.open("floppy.dat",ios::in|ios::binary);
cout<<"Search according to\n"<<"1.Name\n"<<"2.Id\n";
cin>>w;
if(w==1)
{
char n[20],e[20];
cout<<"Enter the name you want to search\n";
gets(n);
while(file.read((char*)&f1,sizeof(f1)))
{
strcpy(e,f1.name);
if(strcmp(n,f1.name)==0)
f1.display();
};
file.close();
break;
}
if(w==2)
{
int i;
cout<<"Enter the Id of the floppy you want to search\n";
cin>>i;
while(file.read((char*)&f1,sizeof(f1)))
{
if(f1.floppy_id==i)
f1.display();
};
file.close();
break;
}
}
cout<<"Do you want to continue?(y/n)";
cin>>q;
}while(q=='y');
getch();
}
OUTPUT
//menu driven program to create a file,read a file,edit a record or insert a new record
//header files used
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<string.h>
#include<fstream.h>
int r=1;
class book
{ public:
int book_id;
char name[20];
int pages;
void getdata()
{ cout<<"Enter the book id ";
cin>>book_id;
cout<<"Enter the name of the book ";
gets(name);
cout<<"Enter the number of pages in the book ";
cin>>pages;
} void display()
{ cout<<"Book Id ===>"<<book_id;
cout<<"\nBook Name ===>";
puts(name);
cout<<"Pages===>"<<pages<<"\n"<<"\n";
} }f1,f2;
void create(); //function prototype
void showfile() //function to read a file
{ fstream file;
file.open("book.dat",ios::in|ios::binary);
while(file.read((char*)&f1,sizeof(f1)))
{ f1.display();
};
file.close();
} void rewrite() //function to rewrite a file
{ fstream file,temp;
file.open("book.dat",ios::out|ios::binary);
temp.open("temp.dat",ios::in|ios::binary);
while(temp.read((char*)&f1,sizeof(f1)))
{ file.write((char*)&f1,sizeof(f1));
} file.close();
temp.close();
remove("temp");
} //main program
void main()
{ clrscr();
fstream file,temp;
int ch,r=0;
char q;
do
{ clrscr();
cout<<"What do you want to do ?\n";
cout<<"1.Create a file\n";
cout<<"2.Read a file\n";
cout<<"3.Edit nth record\n";
cout<<"4.Insert a record after nth record\n";
cout<<"5.Insert a record after a specified book id\n";
cout<<"Enter your choice ";
cin>>ch;
switch(ch)
{ case 1: create();
break;
case 2: showfile();
break;
case 3:
int i;
cout<<"Enter the record no. you want to edit ";
cin>>i;
cout<<"Enter the altered record\n";
f2.getdata();
temp.open("temp.dat",ios::out|ios::binary);
file.open("book.dat",ios::in|ios::binary);
while(file.read((char*)&f1,sizeof(f1))) //case for editing a specified record
{ r++;
if(r==i)
temp.write((char*)&f2,sizeof(f2));
else
temp.write((char*)&f1,sizeof(f1));
}; file.close();
temp.close();
rewrite();
showfile();
break;
case 4:
int y=0,u;
cout<<"Enter the new record\n";
f2.getdata();
cout<<"Enter the record after which you want to insert the record ";
cin>>u;
temp.open("temp.dat",ios::out|ios::binary);
file.open("book.dat",ios::in|ios::binary);
while(file.read((char*)&f1,sizeof(f1)))
{ y++;
if(y==u)
{ temp.write((char*)&f1,sizeof(f1)); //case for inserting a record at a specified postion
temp.write((char*)&f2,sizeof(f2));
} else
temp.write((char*)&f1,sizeof(f1));
}; temp.close();
file.close();
rewrite();
showfile();
break;
case 5:
int w;
cout<<"Enter the new record\n";
f2.getdata();
cout<<"enter the book id after which you want to insert the record ";
cin>>w;
file.open("book.dat",ios::in|ios::binary);
temp.open("temp.dat",ios::out|ios::binary);
while(file.read((char*)&f1,sizeof(f1)))
{ if(f1.book_id!=w)
temp.write((char*)&f1,sizeof(f1)); //case for inserting a record after a specified book id
else
{ temp.write((char*)&f1,sizeof(f1));
temp.write((char*)&f2,sizeof(f2));
} }
temp.close();
file.close();
rewrite();
showfile();
break;
} cout<<"Do you want to continue?(y/n) ";
cin>>q;
}while(q=='y');
getch();
} void create() //function to create a file
{ char c;
fstream file;
file.open("book.dat",ios::out|ios::binary);
do
{ clrscr();
f1.getdata();
file.write((char*)&f1,sizeof(f1));
cout<<"Do you want to enter another record?(y/n)";
cin>>c;
} while(c=='y');
file.close();
}
OUTPUT
//Menu driven program to create a file,read a file,delete the last record or delete any record
//header files used
#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<string.h>
#include<fstream.h>
int r=0;
class employee
{ public:
int eno;
char ename[20];
double salary;
void getdata()
{ cout<<"Enter the employee no. ";
cin>>eno;
cout<<"Enter the name of the employee ";
gets(ename);
cout<<"Enter the employee's salary ";
cin>>salary;
} void display()
{ cout<<"Employee no. ===>"<<eno;
cout<<"\nEmployee's Name ===>";
puts(ename);
cout<<"Salary ===>"<<salary<<"\n";
} } f1;
void create(); //function prototype
void showfile() //function to read a file
{ fstream file;
file.open("emp.dat",ios::in|ios::binary);
while(file.read((char*)&f1,sizeof(f1)))
{ f1.display();
}; file.close();
} void rewrite() //function to rewrite a file
{ fstream file,temp;
file.open("emp.dat",ios::out|ios::binary);
temp.open("temp.dat",ios::in|ios::binary);
while(temp.read((char*)&f1,sizeof(f1)))
{ file.write((char*)&f1,sizeof(f1));
} file.close();
temp.close();
remove("temp");
} void dellst() //function to delete the last record
{ fstream file,temp;
int e=1;
file.open("emp.dat",ios::in|ios::binary);
temp.open("temp.dat",ios::out|ios::binary);
file.seekg(0);
while(file.read((char*)&f1,sizeof(f1)))
{ if(e!=r)
{ temp.write((char*)&f1,sizeof(f1));
e++;
} file.close();
temp.close();
rewrite();
} showfile();
} void main()
{ clrscr();
fstream file,temp;
int ch,r=0;
char q;
do
{ clrscr();
cout<<"What do you want to do ?\n";
cout<<"1.Create a file\n";
cout<<"2.Read a file\n";
cout<<"3.Count the no. of records\n";
cout<<"4.Delete the last record\n";
cout<<"5.Delete any record\n";
cout<<"Enter your choice ";
cin>>ch;
switch(ch)
{ case 1: create();
break;
case 2: showfile();
break;
case 3:
file.open("emp.dat",ios::in);
while(file.read((char*)&f1,sizeof(f1)))
{ r++;
};
file.close();
cout<<"No. of records= "<<r;
break;
case 4: dellst();
break;
case 5:
int w,t=1;
cout<<"enter the record you want to delete ";
cin>>w;
file.open("emp.dat",ios::in|ios::binary);
temp.open("temp.dat",ios::out|ios::binary);
while(file.read((char*)&f1,sizeof(f1))) //case to delete any record
{ if(t!=w)
temp.write((char*)&f1,sizeof(f1));
t++;
} temp.close();
file.close();
rewrite();
showfile();
break;
} cout<<"Do you want to continue?(y/n)";
cin>>q;
}while(q=='y');
getch();
}void create() //function to create a file
{ char c;
fstream file;
file.open("emp.dat",ios::out|ios::binary);
do
{ clrscr();
f1.getdata();
file.write((char*)&f1,sizeof(f1));
cout<<"Do you want to enter another record?(y/n)";
cin>>c;
}while(c=='y');
file.close();
}
OUTPUT
/*Program To Find The Largest Number
Using Pointers*/
#include<iostream.h>
#include<conio.h>
int *big(int &a, int &b, int &c)
{ if((a>b) && (a>c))
return (&a);
if((b>c) && (b>a))
return (&b);
else
return(&c);
}
void main()
{ clrscr();
int *big(int&, int&,int&);
int n1,n2,n3,*large;
cout<<" Enter the numbers: \n";
cin>>n1>>n2>>n3;
large=big(n1,n2,n3);
cout<<"The largest number is: "<<*large;
getch();
}
OUTPUT
/* Wap using pointers to swap two integers. */
#include<iostream.h>
#include<conio.h>
void swap_using_pointers(int *, int *);
void main()
{
clrscr();
int a,b;
cout<<"\n\nEnter first integer : "; cin>>a;
cout<<"\n\nEnter second integer : "; cin>>b;
swap_using_pointers(&a,&b);
cout<<"\n\nNow value of first integer = "<<a;
cout<<"\n\nNow value of second integer = "<<b;
getch();
}
void swap_using_pointers(int *a,int *b)
{
int temp;
temp=*a;
*a=*b;
*b=temp;
}
OUTPUT
/* PROGRAM FOR INSERTION,DELETION & DISPLAY
OF QUEUE USING ARRAY*/
#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<process.h>
int del(int[]);
int insert(int[],int);
void display(int[] ,int,int);
const int size=50;
int queue[size],front=-1,rear=-1;
void main()
{ clrscr();
int item,res;
char ch='y';
while(ch=='y'||ch=='Y')
{
cout<<"Enter Number for insertion : ";
cin>>item;
res=insert(queue,item);
if(res==-1)
{ cout<<"\nOVERFLOW ";
exit(1);}
cout<<"Now the Queue (Front to Rear) is :- \n";
display(queue,front,rear);
cout<<"Want to insert more elements (y/n) : ";
cin>>ch;
}
cout<<"\nQueue After Deletion:";
ch='y';
while(ch=='y'||ch=='Y')
{ res=del(queue);
if(res==-1)
{ cout<<"\nUNDERFLOW ";
exit(1);}
else
{ cout<<"\nElement Deleted is : "<<res<<endl;
cout<<"\nNow the Queue(Front to Rear) is :- \n";
display(queue,front,rear);
cout<<"\nWant to delete more elements (y/n) : ";
cin>>ch;
}
}
getch();
}
int insert(int queue[],int ele)
{ if(rear==size-1)
return -1;
else if(rear==-1)
{
front=rear=0;
queue[rear]=ele;
}
else
{
rear++;
queue[rear]=ele;
}
return 0;
}
int del(int queue[])
{
int ret;
if(front==-1)
return -1;
else
{
ret=queue[front];
if(front==rear)
front=rear=-1;
else
front++;
}
return ret;
}
void display(int queue[],int front,int rear)
{
if(front==-1)
return ;
for(int i=front;i<rear;i++)
cout<<queue[i]<<"\t<-\t";
cout<<queue[rear]<<endl;
}
OUTPUT
//This program illustrates how to insert a node at kth position using Linked List
#include<iostream.h>
#include<conio.h>
class NODE
{ public:
int bookno;
NODE *link;
};
class LINKLIST
{ private:
NODE *first, *last,*temp;
public:
void NCREATE(int);
void insertatk(int);
void display();
};
void LINKLIST::NCREATE(int n)
{ first=new NODE;
cout<<"\n Enter the book no";
cin>>first->bookno;
first->link=NULL;
temp=first;
for(int i=1;i<n;i++)
{ last=new NODE;
cout<<"\n Enter the book number";
cin>>last->bookno;
last->link=NULL;
temp->link=last;
temp=last;
}
}
void LINKLIST::insertatk(int j)
{ int i=0;
NODE *newnode,*back;
newnode= new NODE;
cout<<"\nEnter the data value";
cin>>newnode->bookno;
newnode->link=NULL;
temp=first;
while( i<(j-1))
{ back=temp;
temp=temp->link;
i++;
}
back->link=newnode;
newnode->link=temp;
}
void LINKLIST::display()
{ temp=first;
cout<<"\nThe Linked List is: \n";
while(temp!=NULL)
{ cout<<"\n"<<temp->bookno;
temp=temp->link;
}
getch();
}
void main()
{ int ch,n,k;
LINKLIST list;
clrscr();
cout<<"\nEnter how many nodes in the list: ";
cin>>n;
list.NCREATE(n);
do
{ clrscr();
cout<<"\n1. For insert ";
cout<<"\n2. For display ";
cout<<"\n3. For quit ";
cout<<"\nEnter your choice ";
cin>>ch;
switch(ch)
{ case 1: cout<<"\nEnter the position at which insertion is required ";
cin>>k;
list.insertatk(k);
break;
case 2: list.display();
break;
}
}while(ch!=3);
}
OUTPUT
//This program illustrates the basic operations on stacks using array
#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<stdio.h>
#include<ctype.h>
#define MAX 100
char stack[MAX];
int top;
void push(char stack[],char vl,int &top);
char pop(char stack[], int &top);
void show_stack(char stack[], int top);
void main()
{ int choice;
char val, opt='Y';
top=-1;
clrscr();
do
{ cout<<"\n\t\tMain Menu"<<endl;
cout<<"\t1. Addition of stack"<<endl;
cout<<"\t2. Deletion from stack"<<endl;
cout<<"\t3. Traversal of stack"<<endl;
cout<<"\t4. Exit from Menu"<<endl;
cout<<"Enter your choice: "<<endl;
cin>>choice;
switch(choice)
{ case 1: do
{ cout<<"Enter the value to be added to be added in the stack: "<<endl;
cin>>val;
push(stack,val,top);
cout<<"Do you want to add more element(Y/N)?: "<<endl;
cin>>opt;
} while(toupper(opt)=='Y');
break;
case 2: opt='Y';
do
{ val=pop(stack,top);
if (val!=-1)
cout<<"Value deleted from the stack is: "<<val<<endl;
cout<<"Do you want to delete more element(Y/N): "<<endl;
cin>>opt;
} while(toupper(opt)=='Y');
break;
case 3: show_stack(stack,top);
break;
case 4: exit(0);
}
}while(choice!=4);
}
void push(char stack[],char val,int &top)
{ if (top==MAX)
{ cout<<"Stack Overflow!"<<endl;
}
else
{ top=top+1;
stack[top]=val;
}
}
char pop( char stack[],int &top)
{ char value;
if (top<0)
{ cout<<"Stack Underflow!"<<endl;
value=-1;
}
else
{ value=stack[top];
top=top-1;
}
return(value);
}
void show_stack(char stack[],int top)
{ int i;
i=top;
clrscr();
cout<<"The values are: ";
do
{ cout<<"\n"<<stack[i];
i=i-1;
}
while(i>=0);
}
OUTPUT
