PlanProgram

#include <iostream>
using namespace std;

int main() {

   // plan rates
    const float planA = 39.99;
    const float planB = 59.99;
    const float planC = 69.99;

    // minutes allowed per plan
    const int limitA = 450;
    const int limitB = 900;

    // rates for additional minutes
    const float additionalMinutesA = 0.45;
    const float additionalMinutesB = 0.40;

    // choose plan
    float plan;

    // total minutes used
    float totalMinutes;

    // amount charged
    float amountChargedA = (totalMinutes - limitA) * additionalMinutesA;
    float amountChargedB = (totalMinutes - limitB) * additionalMinutesB;
    float amountChargedC = planC;


    cout << "Voice plans: " << endl;
    cout << "A. The 450 minute plan" << endl;
    cout << "B. The 900 minute plan" << endl;
    cout << "C. The unlimited plan" << endl;

    cout << "Enter which voice plan the customer subscribes to: ";
    cin >> plan;

    cout << "Enter the total number of minutes used during the month: ";
    cin >> totalMinutes;

    cout << endl;

    if (planA) {
        cout << "The amount due for the month is $" << amountChargedA << endl;
        cout << "Amount saved if you were on Plan B: $" << (amountChargedA - amountChargedB) << endl;
        cout << "Amount saved if you were on Plan C: $" << (amountChargedA - amountChargedC) << endl;
        }

        else if (planB) {
            cout << "The amount due for the month is $" << amountChargedB << endl;
            cout << "Amount saved if you were on Plan C: $" << (amountChargedB - amountChargedC) << endl;
        }

        else if (planC) {
            cout << "The amount due for the month is $" << amountChargedC << endl;
        }

        else (plan != planA || plan != planB || plan != planC); {
            cout << "The voice plan entered is invalid." << endl;
        }

    cout << endl;

    return 0;
}