this pointer in c++

What is this pointer in c++:

this pointer in c++, This pointer means Every object has access to its own address through an important pointer is called this pointer. When a member function is called, this pointer automatically passed an implicit argument that is a pointer to the invoking object.

Example program for this pointer in c++:

#include < iostream >
using namespace std;
class pwr {
double b;
int e;
double val;
public:
pwr(double base, int ex);
double get_pwr() { return val; }
};
pwr::pwr(double base, int ex)
{
b = base;
e = ex;
val = 1;
if(exp==0) return;
for( ; ex>0; ex–) val = val * b;
}
int main()
{
pwr x(4.0, 2), y(2.5, 1), z(5.7, 0);
cout << x.get_pwr() << ” “;
cout << y.get_pwr() << ” “;
cout << z.get_pwr() << “n”;
return 0;
}

Output:

16 2.5 1

Within a member function, The member of the class can be accessed directly. Inside pwr the statement
b = base
Which means, the copy of the b associated with the invoking object, the however same statement is written like this
this->b = base
This pointer points to the object that invoked pwr ().

Here the entire pwr constructor is written using this pointer

pwr :: pwr(double base, int ex)
{
this->b = base;
this->e = ex;
this->val = 1;
if(ex==0)
return;
for(; ex>0; ex--)
this->val = this->val * this->b;
}

Note

Actually, no c++ program would be written like this, showing purpose we write this. the standard form is easier than this.

Recommended Posts:

Leave a Comment