C++ Programming also object oriented programming in c++

       SOMETHING ABOUT C++
Contents:-
data types
Identifiers
Keywords
calculate the no.of vowels
fectorial of a number
Armstrong number
C++ and oop
class,object,constructor,copy constructor,
destructor and more programmings
DATA TYPES:-
char
int
float
double
void
bool

DATA TYPE MODIFIERS:-
signed
unsigned
long
short

Identifiers
hello_world
_abc
DEFINED

Reserved Words(Keywords)

Variable Declaration Words:-
char
double 
float

Statements Words:-
break
else
if 
case

Storage Allocation Identifier
const
volatile
static
void



…………………………………

A program in c++ to calculate the number of vowels .


#include<iostream>
using namespace std;
int main()
{
int a=0,e=0,i=0,o=0,u=0;
int i;
char ch[100];
cout<<"This program read only 20 character.";
cout<<"\nEnter Only in capital letter:";
cin>>ch;

cout<<"\nA    E    I    O    U\n";
for(i=0;i<=19;i++)
{
switch(ch[i])
{
case 'A':
a=a+1;
break;

case 'E':
e=e+1;
break;

case 'I':
i=i+1;
break;

case 'O':
o=o+1;
break;

case 'U':
u=u+1;
break;

}
}

cout<<a<<"    "<<e<<"    "<<i<<"    "<<o<<"    "<<u;
return 0;
}


Output:
This program read only 20 character.
Enter only in capital letter:
AAAPQEIGHDHJJFDDFHJJDF
A    E    I    O    U
3    1    1    0    0

…………………………………………………………







#include<iostream>
using namespace std;
int main()
{
int a;
cout<<"Enter a no.";
cin>>a;
cout<<"Entered no. is "<<a;
return 0;
}

Output:
Enter a no.3
Entered no. is 3


-------------------------
use of 'endl'
…………………………………

#include<iostream>
using namespace std;
int main()
{
cout<<"Welcome"<<endl;
cout<<"c++ programming";
cout<<"It's a test.";
return 0;
}

Output:
Welcome
c++programmingIt's a test.

…………………………………………………
…………………………………………………

class and members

#include<iostream>
using namespace std;
class student
{
public:
void display()
{
cout<<"Welcome";
}
};

int main()
{
student a;
a.display();
return 0;
}


Output:
Welcome


…………………………………
Other method to write this program
…………………………………

#include<iostream>
using namespace std;
class student
{
public:
void display();
};

void student::display()
{
cout<<"Welcome";
}

int main()
{
student a;
a.display();
return 0;
}


Output:
Welcome


………………………………
………………………………

#include<iostream>
using namespace std;
class school
{
public:
int schoolno;
void enter();
void display();
};

void school::enter()
{
cout<<"Enter school number:";
cin>>schoolno;
}

void school::display()
{
cout<<"School number is "<<schoolno;
}

int main()
{
school abcd;
abcd.enter();
abcd.display();
return 0;
}



Output:
Enter school number:3
School number is 3

…………………………………………………

Constructors

#include<iostream>
using namespace std;
class school
{
public:
int schoolid;
school();        /* constructor */
void enter();
void display();
};

school::school()   //constructor
{
cout<<"Welcome\n";
}


void school::enter()
{
cout<<"Enter school id:";
cin>>schoolid;
}

void school::display()
{
cout<<"School id:"<<schoolid;
}

int main()
{
school sss;             

/*Constructors enable automatic initialisation of objects */

sss.enter();
sss.display();
return 0;
}


Output:
Welcome
Enter school id:4
School id:4



COPY CONSTRUCTOR

#include<iostream>
using namespace std;
class school
{
public:
string name;
school();
school(school &cpy)
void display();
};

school::school()
{
name="Government primary school";
}

//copy constructor
school::school(school &cpy)
{
name=cpy.name;
}

void school::display()
{
cout<<name;
}

int main()
{
school obj;
obj.display();
return 0;
}


Output:
Government primary school

…………………………………………………

DESTRUCTORS

#include<iostream>
using namespace std;
class test
{
public:
~test();
};

test::~test()
{
cout<<"Welcome";
}

int main()
{
test a;
return 0;
}

Output:
Welcome
------------------------

#include<iostream>
using namespace std;
class test
{
public:
~test()
{
cout<<"Welcome";
}
};

int main()
{
test a;
return 0;
}

Output:
Welcome

------------------------------------
Both constructor and destructor

#include<iostream>
using namespace std;
class test
{
public:
test()
{
cout<<"Welcome\nEnter a number:";
}
~test()
{
cout<<\nIt's over.";
}
void even()
{
cout<<"The number is even.";
}
void odd()
{
cout<<"The number is odd.";
}
};

int main()
{
int a;
test aaa;
cin>>a;
if(a%2==0)
{
aaa.even();
}
else
{
aaa.odd();
}
return 0;
}

Output:
Enter a number:4
The number is even.
It's over.

…………………………………………………
------------------------------------
A program in c++ to find the factorial of a number.
(Using class and objects)

#include<iostream>
using namespace std;
class factorial
{
public:
int n,sum=1;
void calculation();
void display();
};

void factorial::calculation()
{
int i;
cout<<"Enter the number:";
cin>>n;
for(i=1;i<=n;i++)
{
sum=sum*i;
}
}

void factorial::display()
{
cout<<"Factorial of the given number="<<sum;
}

int main()
{
factorial aaa;
aaa.calculation();
aaa.display();
return 0;
}


Output:
Enter the number:4
Factorial of the given number=24


………………………………………………………


A program to find Armstrong number.


#include<iostream>
using namespace std;
int main()
{
int n,r;
int sum=0;
int temp;

cout<>"Enter a number:";
cin>>n;

temp=n;

while(temp != 0)
{
r=temp%10;
sum=sum+r*r*r;
temp=temp/10;
}

if(sum==n)
{
cout<<"Entered number is Armstrong number.";
}
else
{
cout<<"Entered number is not Armstrong number.";
}

return 0;
}

Enter a number:453
Entered number is not Armstrong number.





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