More programs on Class Concept

Program 1

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
class stock
{
int icode,qty;
char des[20];
float price,discount;
void finddisc()
{
if(qty<=50)
discount=0;
else if(qty<=100)
discount=5;
else
discount=10;
}
public:
void buy()
{
cout<<"Enter icode,name,price,quantity"<<endl;
cin>>icode;
gets(des);
cin>>price>>qty;
finddisc();
}
void showall()
{
cout<<"The item code is"<<icode<<endl;
cout<<"The item description is"<<des<<endl;
cout<<"The Price is"<<price<<endl;
cout<<"The quantity is"<<qty<<endl;
cout<<"The discount  is"<<discount<<endl;
}
};
void main()
{
stock s;
clrscr();
s.buy();
s.showall();
getch();
}





Program 2

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
class resort
{
int rno;
char name[20];
float charges,amount;
int days;
float compute()
{
  if((days*charges)>11000)
{
return 1.02*days*charges;
}
else
{
return days * charges;
}
}
public:
void getinfo()
{
cout<<"enter room no , name , charges and days"<<endl;
cin>>rno;
gets(name);
cin>>charges>>days;
}
void dispinfo()
{
cout<<"Room No is:  " <<rno<<endl;
cout<<"Customer name is :" <<name<<endl;
cout<<"Amount is :"<<compute();
}
};
void main()
{
clrscr();
resort r;
r.getinfo();
r.dispinfo();
getch();
}

Classes & Objects
A Class is a collection of data and functions working on that data. The class follows the concept of encapsulation.
An object is an instance of class containing real world data.

In a class we simply declare member data and define member functions that work on the data but the value of the data is in correspondence to the object.

 #include<iostream.h>
#include<conio.h>
class student
{
int rno;
char name[20];
float fees;
public:
void accept()
{
cout<<"Enter the details of the student"<<endl;
cin>>rno
gets(name);
cin>>fees;
}
void disp()
{
cout<<"The rollno is '<<rno<<endl;
cout<<"The Nmae is"<<name<<endl;
cout<<"The Fees is "<<fees;
}
};
void main()
{
clrscfr();
student s;
s.accept();
s.disp();
getch();
}

On the demand of the students I am uploading some basic programs.Hope this will benefit you all.


// WRITE A PROGRAM TO ENTER TEMP IN FAHRENHIET AND CONVER IT IN CELCIUS
#include<iostream.h>
#include<conio.h>
void main()
{
float f,c;
cout<<"enter temp in fahrenheit"<<endl;
cin>>f;
c=5*(f-32)/9;
cout<<"The temp in celcius is:"<<c<<endl;
getch();
}

// WRITE A PROGRAM TO ENTER TWO NUMBERS AND SWAP THEM

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int x,y,z;

cout<<"Enter two numbers"<<endl;

cin>>x>>y;

z=x;

x=y;

y=z ;

cout<<"The numbers after swapping:"<<endl;

cout<<"x is :="<<x<<endl<<"y is :="<<y<<endl;

getch();

}

// WRITE A PROGRAM TO ENTER TWO NUMBERS AND SWAP THEM WITHOUT USING THIRD VARIABLE

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int x,y,z;

cout<<"Enter two numbers"<<endl;

cin>>x>>y;

x=x+y;

x=x-y;

y=x-y;

cout<<"The numbers after swapping:"<<endl;

cout<<"x is :="<<x<<endl<<"y is :="<<y<<endl;

getch();

}

//enter a four digit number and find the sum of first and last

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int num,first,last,sum;

cout<<"enter a four digit number"<<endl;

cin>>num;

last=num%10;

first=num/1000;

sum=first+last;

cout<<"the sum of first and last digit is ="<<sum<<endl;

getch();

}

Linked Stack and Linked Queue

//PROGRAM TO IMPLEMENT LINKED STACK
#include<iostream.h>
#include<conio.h>
struct node
{
int data;
node * next;
};
class stack
{
node *top;
public:
stack()
{
top=NULL;
}
void stackpush();
void stackpop();
void displaystack();
};
void stack::stackpush()
{
node *ptr;
ptr=new node;
cout<<"Enter the element to be pushed"<<endl;
cin>>ptr->data;
if(top==NULL)
ptr->next=NULL;
else
ptr->next=top;
top=ptr;
}
void stack ::stackpop()
{
node *ptr;
ptr=new node;
ptr=top;
cout<<"The popped element is "<<ptr->data;
top=top->next;
delete ptr;
}
void stack :: displaystack()
{
node *ptr;
ptr=new node;
ptr=top;
cout<<"The stack is "<<endl;
while(ptr!=NULL)
{
cout<<ptr->data<<endl;
ptr=ptr->next;
}
}
void main()
{
clrscr();
char ans;
stack s1;
do
{
s1.stackpush();
cout<<"wish to continue "<<endl;
cin>>ans;
}while(ans=='y');
s1.displaystack();
cout<<"Press any key to pop an element"<<endl;
getch();
s1.stackpop();
getch();
}





//PROGRAM TO IMPLEMENT LINKED QUEUE
#include<iostream.h>
#include<conio.h>

struct node
{
int data;
node * next;
};

class queue
{
node *front,*rear;
public:
queue()
{
rear=front=NULL;
}
void insqueue();
void delqueue();
void dispqueue();
};
void queue::insqueue()
{
node *ptr;
ptr=new node;
cout<<"Enter the element to be insert"<<endl;
cin>>ptr->data;
ptr->next=NULL;
if(rear==NULL)
front=rear=ptr;
else
{
rear->next=ptr;
rear=ptr;
}
}
void queue ::delqueue()
{
node *ptr;
ptr=new node;
ptr=front;
cout<<"The deleted element is "<<ptr->data;
if(front==rear)
front=rear=NULL;
else
front=front->next;

delete ptr;
}

void queue :: dispqueue()
{
node *ptr;
ptr=new node;
ptr=front;
cout<<"The queue is "<<endl;
while(ptr!=NULL)
{
cout<<ptr->data<<endl;
ptr=ptr->next;
}
}
void main()
{
clrscr();
char ans;
queue q1;
do
{
q1.insqueue();
cout<<"wish to continue "<<endl;
cin>>ans;
}while(ans=='y');
q1.dispqueue();
cout<<"Press any key to delete an element ...."<<endl;
getch();
q1.delqueue();
getch();
}

Array in C++

This is a new post about the important concept of C++ Programming : - ARRAY


//WRITE A PROGRAM TO ENTER TEN NUMBERS IN AN ARRAY AND DISPLAY THEM
#include<iostream.h>
#include<conio.h>
void main()
{
int arr[10],i;
cout<<"Enter Ten numbers in an array"<<endl;
for(i=0;i<10;i++)
{
cin>>arr[i];
}
cout<<"The array elements are "<<endl;
for(i=0;i<10;i++)
{
cout<<arr[i]<<endl;
}
getch();
}

//WRITE A PROGRAM TO ENTER TEN NUMBERS IN AN ARRAY AND DISPLAY THEIR SUM

#include<iostream.h>

#include<conio.h>

void main()

{

int arr[10],i,sum=0;

cout<<"Enter Ten numbers in an array"<<endl;

for(i=0;i<10;i++)

{

cin>>arr[i];

sum=sum+arr[i];

}

cout<<"The sum is "<<sum<<endl;

getch();

}

//WRITE A PROGRAM TO ENTER TEN NUMBERS IN AN ARRAY AND DISPLAY THE BIGGEST OF THEM

#include<iostream.h>

#include<conio.h>

void main()

{

int arr[10],i,big=0;

cout<<"Enter Ten numbers in an array"<<endl;

for(i=0;i<10;i++)

{

cin>>arr[i];

if(arr[i]>big)

big=arr[i];

}

cout<<"The biggest number is "<<big<<endl;

getch();

}

//WRITE A PROGRAM TO ENTER TEN NUMBERS IN AN ARRAY AND DISPLAY THE SMALLEST OF THEM

#include<iostream.h>

#include<conio.h>

void main()

{

int arr[10],i,small;

small=arr[0];

cout<<"Enter Ten numbers in an array"<<endl;

for(i=1;i<10;i++)

{

cin>>arr[i];

if(arr[i]<small)

small=arr[i];

}

cout<<"The smallest number is "<<small<<endl;

getch();

}

Stack using structure

#include<iostream.h>
#include<conio.h>
#define MAX 100
struct stack
{
int arr[MAX];
int top;
}s;
void push(stack *,int);
int pop(stack *);
void disp(stack *);

void main()
{
int ch;
s.top=-1;
clrscr();

char ans='y';
while(ans=='y'||ans=='Y')
{
clrscr();
cout<<"Operations on Stack"<<endl;
cout<<"1. Push"<<endl;
cout<<"2. Pop"<<endl;
cout<<"3.Display"<<endl;
cout<<"Enter the choice"<<endl;
cin>>ch;
 switch(ch)
 {
 case 1:
 int val;
 cout<<"enter a number to push"<<endl;
 cin>>val;
 push(&s,val);
 break;
 case 2:
 int x;
 x=pop(&s);
 cout<<"The popped element is "<<x<<endl;
 break;
 case 3:
 disp(&s);
 break;
 default:
 cout<<"invalid choice"<<endl;
 }

cout<<"do u wish to continue y/n"<<endl;
cin>>ans;
}
getch();
}
void push(stack *s1,int x)
{
if(s1->top==-1)
{
s1->top=0;
}
else if(s1->top==(MAX-1))
{
cout<<"Stack is full"<<endl;
}
else
{
s1->top++;
}
s1->arr[s1->top]=x;
}
int pop(stack *s1)
{
int temp;
if(s1->top==-1)
{
cout<<"can't pop elements"<<endl;
}
else
{
temp=s1->arr[s1->top];
s1->top--;
return temp;
}

}
void disp(stack *s1)
{
int i;
for(i=s1->top;i>=0;i--)
{
cout<<s1->arr[i]<<endl;
}
}

Program of Stack using array


This Program is displaying all the main functions of a stack like Push, Pop and display


#include<iostream.h>
#include<conio.h>
#include<process.h>
#define MAX 10
void push(int[],int);
int pop(int[]);
void disp(int[]);
     int top=-1;
void main()
{
int arr[MAX];
int i;
char ans='y';
while(ans=='y')
{
clrscr();
cout<<"Operations on stacks are "<<endl;
cout<<"1. Push "<<endl;
cout<<"2. Pop "<<endl;
cout<<"3. Display "<<endl;
cout<<"Enter your choice "<<endl;
int ch;
cin>>ch;
switch(ch)
{
case 1:
cout<<"Enter an element to push"<<endl;
int x;
cin>>x;
push(arr,x);
break;
case 2:
int y;
y=pop(arr);
cout<<"The element deleted is"<<y<<endl;
break;
case 3:
disp(arr);
break;
}
cout<<"Do u wish to cont y/n"<<endl;
cin>>ans;
}

getch();
}

void push(int a[],int x)
{
if(top==(MAX-1))
{
cout<<"The stack is full"<<endl;
cout<<"Press any key to exit............"<<endl;
getch();
exit(0);
}
else
{
if(top==-1)
{
top=0;
}
else
{
top++;
}
a[top]=x;
}
}
int pop(int a[])
{
int z=a[top];
top--;
return z;
}
void disp(int a[])
{
int i;
for(i=top;i>=0;i--)
{
cout<<a[i]<<endl;
}
}