Shipping Calculator

/*
Name: Nickelis Jarvis
Date: 9.24.14
Program Name: Shipping Calculator
Description: Calculate shipping charges or flag if too heavy or shipped too close.
*/

#include <iostream>
#include <iomanip>

using namespace std;

int main() {
    //Declare integers for weight and distance, no need to initialize; will be done later.
    int packageWeight, shipDistance;

    //Declare constant integer variables for minimum distance, maximum distance, modulus
    //(length of distance), maximum package weight, and output formatting (width of fill line and column widths)
    const int
        shipDistance_MIN = 10,
        shipDistance_MOD = 500,
        shipDistance_MAX = 3000,
        packageWeight_MAX = 50,
        fillWidth = 66,
        columnWidth[2] = { 40, 4 };

    //Declare constant double precision floating-point array, initialize with set of shipping rates; declare pointer to array afterwards for
    //stepping through array (used in if-else statement later)
    const double shipRate[4] = {
        1.10,
        2.20,
        3.70,
        4.80
    }, *p_shipRate = shipRate;

    //Output UI, format with fill lines, set column widths for clarity.
    cout << "Fast Freight Shipping Company Rates" << endl;
    cout << setfill('_') << setw(fillWidth) << "" << setfill(' ') << endl;
    cout << setw(columnWidth[0]) << left << "Weight of Package" << "Rate per 500 miles shipped" << endl;
    cout << setfill('_') << setw(fillWidth) << "" << setfill(' ') << endl;
    cout << fixed << setprecision(2);
    cout << setw(columnWidth[0]) << left << "5 pounds or less" << "$" << setw(columnWidth[1]) << shipRate[0] << endl;
    cout << setw(columnWidth[0]) << left << "Over 5 pounds but not more than 15" << "$" << setw(columnWidth[1]) << shipRate[1] << endl;
    cout << setw(columnWidth[0]) << left << "Over 15 pounds but not more than 30" << "$" << setw(columnWidth[1]) << shipRate[2] << endl;
    cout << setw(columnWidth[0]) << left << "Over 30 pounds but not more than 50" << "$" << setw(columnWidth[1]) << shipRate[3] << endl;
    cout << setfill('_') << setw(fillWidth) << "" << setfill(' ') << endl;
    cout << setw(8) << "NOTICE: We do not ship packages over 50 lbs" << endl;
    cout << setw(8) << "" << "We do not ship less than 10 miles or more than 3,000" << endl;
    cout << setfill('_') << setw(fillWidth) << "" << setfill(' ') << endl;

    //Get package weight.
    cout << "Enter package weight: ";
    cin >> packageWeight;

    //Get shipping distance.
    cout << "Enter shipping distance: ";
    cin >> shipDistance;

    //if-else statement, check each expression and increment pointer location in shipRate[]; this sets the proper ship rate for weight.
    //else executes if weight is below 0 (negative weight) or over 50lbs (too heavy)
    //if too heavy, wait for keyboard input then exit.
    //NOTE: Would have liked to check for overweight package first, but not allowed as per assignment instructions.
    if (packageWeight >= 0 && packageWeight <= 5)
        p_shipRate = 0;
    if (packageWeight > 5)
        p_shipRate++;
    if (packageWeight > 15)
        p_shipRate++;
    if (packageWeight > 30 && packageWeight < 50)
        p_shipRate++;
    else {
        cout << "Cannot ship, too heavy." << endl;
        system("pause");
        return(0);
    }

    //Check if the shipping distance is too close or too far.\
    //If true, wait for keyboard input then exit.
    if (shipDistance < shipDistance_MIN || shipDistance > shipDistance_MAX){
        cout << "Cannot ship, too close / far.";
        system("pause");
        return(0);
    }

    //Divide shipping distance into lengths of 500 miles, if there is a remainder, increment shipLengths by 1 (round up).
    int shipLengths = shipDistance;
    shipLengths /= shipDistance_MOD;
    if (shipDistance % shipDistance_MOD)
            shipLengths++;

    //output shipping rate (selected by if-else statement above), number of 500-mile segments, and total cost to ship.
    cout << fixed << setprecision(2) << "Shipping rate: $" << *p_shipRate << endl;
    cout << "Number " << shipDistance_MOD << " mile segments: " << shipLengths << endl;
    cout << "Cost to ship " << packageWeight << " pound package: " << shipLengths * *p_shipRate << endl;

    system("pause");

    return(0);
}