jas

#include<iostream>
#include <iomanip>
using namespace std;

void read_data(double& weight, double& distance);
double find_rate(double weight, double distance);
void print_charge(double weight, double distance, double charge_rate);



int main(void)
{
    double aweight, adist, arate;
    read_data(aweight, adist);
    arate=find_rate(aweight, adist);
    print_charge(aweight, adist,arate);
}

void read_data(double &weight, double &distance)
{
    cout << "Please enter the weight of the parcel (kg): ";
    cin >> weight;
    cout << "Please enter the distance to the destination (km): ";
    cin >> distance;
}
double find_rate(double weight, double distance)
{
    double  rate_per_km;
    if (weight<6)
        if (distance < 100)
        {
            rate_per_km = 1.2;
        }
        else if (distance >= 100 && distance < 300)
        {
            rate_per_km = 1.8;
        }
        else
        {
            rate_per_km = 2.5;
        }
    else if (weight >=6 && weight <30)
        if (distance < 200)
        {
            rate_per_km = 2.2;
        }
        else
        {
            rate_per_km = 2.5;
        }
    else
    {
        rate_per_km = 4.5;
    }

    return rate_per_km;

}
void print_charge(double weight, double distance, double charge_rate)
{
    cout << "---------------------------------------------------------\n";
    cout << setw(20) << "Charge" << "\n";
    cout << "WEIGHT OF THE PARCEL:\t" << setw(10) << weight<<"kg\n";
    cout << "DISTANCE TO THE DESTINATION:\t" << distance<<"km\n";
    cout << "\n";
    cout << "The charge rate is RM " << charge_rate << " per km." << "\n";
    cout << "-------------------------------------------\n";
    cout << "Total delivery cost is RM " << weight*distance << ".\n";
    cout << "-------------------------------------------\n";
}