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Answer to Question #49102 in C++ for Marc

Question #49102
Hi
I need help with my C++ assignment please. It has to be handed in next week.

Write a program that reads in a distance in miles, then calculates and displays the corresponding shipping cost. Each shipment incurs a fixed cost of £50 and the price per mile is calculated according to the rules below
•Each of the first 100 miles (inclusive) cost £5.50
•Over 100 miles and up to 500 miles (inclusive): £4.00 per mile.
•Over 500 miles: £2.50 per mile.

For example, the cost of shipment over a distance of 550.50 miles is £2326.25
(i.e., £50 + (100*5.5) + (400*4.0) + (50.5*2.5)).

if the user enters a negative amount or zero for the distance the program should display an error message

Thank you ever so much.
Expert's answer
#include<iostream>
 
#define FIXED_COST 50
 
double calculate(double miles) {
    double totalCost = 0;
 
    if ( miles <= 0 ) {
        return 0;
    } else
    if ( miles <= 100 ) {
        totalCost = miles * 5.5 + FIXED_COST;
    } else if ( miles > 100 && miles<= 500 ) {
        totalCost = ( miles - 100 ) * 4 + 100 *5.5 + FIXED_COST;
    } else if ( miles > 500 ) {
        totalCost = ( miles - 500 ) * 2.5 + 400* 4 + 100 * 5.5 + FIXED_COST;
    }
 
    return totalCost;
}
 
int main () {
    double miles;
 
    std::cin >> miles;
 
    if ( !calculate(miles) ) {
        std::cout << "Wrongnumber" << std::endl;
        return 0;
    }
 
    std::cout << "Total cost: "<< calculate(miles) << " pounds" << std::endl;
 
 
    return 0;
}

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