C++

Here I am just giving few simple examples with added information in the program as comments or print statements.

Example 1: How to declare variable of pointer type.

// pointer example

#include <iostream>

using namespace std;

int main ()

{

float value1, value2;

float * pointr;

pointr = &value1;

cout << "'pointr' is address of 'value1'\n";

*pointr = 1.0; // assigning value = 1 to memory location pointed by pointr

cout << "above is the value pointed by '*pointr' and is equal to 'value1'\n";

cout << "value1 = " << value1 << endl;

pointr = &value2;

cout << "\n'pointr' is address of 'value2'\n";

*pointr = 2.0; // assigning value = 1 to memory location pointed by pointr

cout << "above is the value pointed by '*pointr' and is equal to 'value2'\n";

cout << "value2 = " << value2 << endl;

cout << "NOTE: Clearly a pointer 'pointr' can take many values in the same program \n";

return 0;

}

Output:

'pointr' is address of 'value1'

above is the value pointed by '*pointr' and is equal to 'value1'

value1 = 1

'pointr' is address of 'value2'

above is the value pointed by '*pointr' and is equal to 'value2'

value2 = 2

NOTE: Clearly a pointer 'pointr' can take many values in the same program

MORE to be added.