Radioactive Decay

/* This program computes the amount of a radioactive substance 

remaining after an initial amount decays for some time period.

 Written by zayad sada  -- Project  -- jun. 24, 2024

 Input: element's name, its half-life, the initial amount, 

and a time period

 Output: the input items and the amount of the substance 

remaining at the end of the time period

 --------------------------------------------------------------------*/

#include <iostream> // cin, cout, <<, >>

#include <string> // string

#include <cmath> // pow()

using namespace std;
int main()

{
 cout << "Enter the name of your radioactive substance: ";

 string element;

 cin >> element;

 cout << "and its half-life (days): ";

 double halfLife;

 cin >> halfLife;

 cout << "Enter the initial amount (mg) and a time period (days): ";

 double initialAmount, time;

 cin >> initialAmount >> time;

 double amountRemaining = initialAmount * pow(0.5, time / halfLife);

 cout << "\nFor " << element

 << " with half-life " << halfLife << " days\n"


 << initialAmount << " mg" << " will be reduced to "

 << amountRemaining << " mg after " << time << " days\n";

}