Program Of This Pointer In C++

#include<iostream.h>

#include<conio.h>

class add

{

private:

int a,b;

public:

void getdata(int a,int b)

{

 this->a=a;

 this->b=b;

}

void display()

{

int c;

c=a+b;

cout<<"\n NAswer="<<c;

cout<<"\n this=="<<this;

}

}

main()

{

clrscr();

int a,b;

add a1,a2;

cout<<"enter first no.";

cin>>a;

cout<<"enter second no.";

cin>>b;

a1.getdata(a,b);

a1.display();

a2.getdata(6,3);

a2.display();

getch();

}

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It is a misbelief that the 'this' pointer is a hidden member of a class or struct. It is a hidden parameter of non-static member functions. When you declare a function the compiler adds an extra parameter to function's prototype. The type of the parameter depends on how the function is declared.

Program Of 2D Array of Pointer In C++

#include<iostream.h>

#include<conio.h>

main()

{

clrscr();

int i,j,a[3][3],*ptr;

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

cout<<"Enter NUmber=";

cin>>a[i][j];

}

}

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

ptr = &a[i][j];

cout<<"\n Value of a["<<i<<"]["<<j<<"]==>"<<a[i][j]<<" And Address of a["<<i<<"]["<<j<<"]==>"<<ptr;

}

cout<<"\n";

}

getch();

}

Program Of Pointer In C

#include<stdio.h>

#include<conio.h>

main()

{

clrscr();

int a,b,c;

int *ptr1,*ptr2,*ptr3;

a=10;

b=15;

c=45;

ptr1=&a;

ptr2=&b;

ptr3=&c;

printf("\n Value of a= %d",a);

printf("\n value of b= %d",b);

printf("\n value of c= %d",b);

printf("\n  Addrss of a= %u",ptr1);

printf("\n Address of b= %u",ptr2);

printf("\n Address of c= %u",ptr3);

getch();

}

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Pointer is a variable that stores a memory address.

 OK, that is simple ! But, what is a memory address then?

 Every variable is located under unique location within a

 computer's memory and this unique location has its

 own unique address, the memory address. Normally,

 variables hold values such as 5 or “hello” and these 

values are stored under specific location within 

computer memory. However, pointer is a different beast,

 because it holds the memory address as its value and

 has an ability to “point” ( hence pointer ) to certain value 

within a memory, by use of its associated memory 

address.