C++ program of queue

In this program we will take a look on working of queue by craeting, inserting, deleting and displaying an queue.

program:

#include<iostream>
#include<conio.h>

using namespace std;

class queue{
private:
int front,counter,maxsize,rear,q[5];
public:
queue();
void create();
void enqueue(int d);
void dequeue();
void show();
};

queue::queue()
{
front=-1;
rear=-1;
maxsize=5;
counter=0;
}
/*
void queue::create()
{
for(int i=0;i<5;i++)
{
cout<<"Enter data at ["<<i<<"] : ";
cin>>q[i];
}
front=0;
rear=5;
}
*/
void queue::enqueue(int d)
{
if(rear==4)
{
cout<<"\n\nQueue is full\n";
}
else
{
cout<<"Enter data : ";
cin>>d;

rear++;
q[rear]=d;
if(front==-1)
{
front=rear=0;
}
}
}

void queue::dequeue()
{
if(front==rear||front==-1)
{
cout<<"\n\nQueue is empty\n";
}
else
{
front++;
cout<<"\n\nData is deleted\n";
if(front==4&&rear==4)
{
front=rear=-1;
}
}
}

void queue::show()
{
if(rear==-1&&front==-1)
{
cout<<"\nQueue is empty\n";
}
else
{

for(int i=front;i<=rear;i++)
{
cout<<"Data at ["<<i<<"] == "<<q[i]<<endl;
}

}
}

int main()
{
queue q;
int c,d;

// q.create();

do{
cout<<"\nPress 1 for enqueue\nPress 2 for dequeue\nPress 3 for show\nPress 4 for exit\nValue == ";
cin>>c;

switch(c)
{
case 1:
q.enqueue(d);
break;
case 2:
q.dequeue();
break;
case 3:
q.show();
break;
case 4:
return 1;
}
}
while(1);
}

//Code Ends

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C++ program of creation, insertion and deletion in array

In this program we will create, print, delete and insert data in array using  methods of data structures.

Program:

#include<iostream>

#include<conio.h>

using namespace std;

class array{

            private:

                        int a[10],size;

                       

            public:

                       

                        array();

                       

                        void create();

                        void print();

                        void insertion(int data,int index);

                        void deletion(int index);

};

array::array()

{

            size=5;

}

void array::create()

{

            for(int i=0;i<size;i++)

            {

                        cout<<"Enter data in index ["<<i<<"] : ";

                        cin>>a[i];

            }

}

void array::print()

{

            cout<<"Your entered data "<<endl;

            for(int i=0;i<size;i++)

            {

                        cout<<"Data at index ["<<i<<"] : "<<a[i]<<endl;

            }

}

void array::insertion(int data,int index)

{          

    

            for(int i=size-1;i>=index;i--)

            {

                        a[i+1]=a[i];

            }

            size++;

           

            a[index]=data;

           

            cout<<"New data after insertion at index["<<index<<"]"<<endl;

            for(int i=0;i<size;i++)

            {

                        cout<<"Index ["<<i<<"] = "<<a[i]<<endl;

            }

}

void array::deletion(int index )

{

            for(int i=index+1;i<=size-1;i++)

            {

                        a[i-1]=a[i];

            }

            size--;

           

            cout<<"After deleting index["<<index<<"]"<<endl;

           

            for(int i=0;i<=size-1;i++)

            {

                        cout<<"Index [        "<<i<<"] = "<<a[i]<<endl;

            }

           

}

int main()

{

            array a;

            int x;

            do{

                       

            cout<<"Enter 1 to enter data : "<<endl;

            cout<<"Enter 2 to show entered data : "<<endl;

            cout<<"Enter 3 to insert data in array : "<<endl;

            cout<<"Enter 4 to delete data in array : "<<endl;

            cout<<"Enter 5 to exit from program : "<<endl;

            cout<<"      Value =     ";

           

                        cin>>x;

            switch (x)

              {

              case 1:

             

                       

                        a.create();

              break;

             

              case 2:

                       

                           a.print();

                                   

                       

                          break;

              case 3:

                        int n,b;

                       

                        cout<<"Enter data : ";

                        cin>>n;

                       

                        cout<<"Enter index : ";

                        cin>>b;

                             a.insertion(n, b);

                         

                          break;

              case 4:

                        int v;

                       

                        cout<<"Enter index to be deleted : ";

                        cin>>v;

                        a.deletion(v);          

                         

                        break;

                       

                        case 5:

                                   

                                                cout<<"Program terminated "<<endl;

                                                return 1;

                                    break;

            }

}

            while(1);

            getch();         

}

//Code Ends

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Recursive function of exponential

In this program we will see how a function calls itself inside its body of fuction.

Program:

#include<iostream>

#include<conio.h>

using namespace std;

int rf(int n,int b)

{

          if(b==1)

          {

                    return n;

                    }

          else 

          {

                    return n*rf(n,b-1);

          }

                   

}

int main()

{

          int m,o;

         

          cout<<"Enter base : ";

          cin>>m;

          cout<<"Enter power: ";

          cin>>o;

         

          cout<<rf(m,o);

          getch();

}

//Code Ends

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