A program that will ask the radius of the circle from the user and then the program will compute the area of a circle using pointers in C++ programming language.

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Program Listing
#include <iostream>
#include <iomanip>  // include iomanip library for setprecision()

using namespace std;

int main() {
    float radius=0.00, area=0.00;
    float *ptr;

    cout <<"\n";
    cout << "\tArea of a Circle Using Pointers in C++\n\n";
    cout << "\tGivethe radius of the circle: ";
    cin >> radius;

    ptr = &radius; // pointer points to the address of radius

    area = 3.14159 * (*ptr) * (*ptr); 
  // dereference pointer to get the value of radius and calculate area

    cout <<"\n\n";
    cout << fixed << setprecision(2); // set output to two decimal places
    cout << "\tThe area of the circle is: " << area << endl;
    cout <<"\n\n";
    cout <<"\tEnd of Program";
    cout <<"\n";
    return 0;