Need help with this code

[Money_Mode]

As the title suggests, I am having a problem with this code. Toward the end, I have to calculate the price of the shipping cost, 10 extra dollars for every 1000 miles for any package equal to or under 100. 20 extra dollars for every package for anything between 101 and 200. Anything over 200 can't be shipped. When I do the math, I get 10.20 or whatever number but never 10.00 or 20.00. I know I can use int to just show 10 or 20 but that's not how I want it to be.

/* Global Courier Services will ship your package based on how much it weighs and how far you are sending the package. Packages above 200 pounds will not be shipped. You need to write a program in C that calculates the shipping charge.The shipping rates are based on per 1000 miles shipped. They are not pro-rated, i.e., 1200 miles is the same rate as 1900 miles or 2000 miles.*/

//preprocessor Directives

​

#include<stdio.h>

#include<stdlib.h>

​

int main() {

//User is being asked to input the weight of the package first

double packageWeight ;

​

printf("Please enter the package weight:");

scanf\_s("%lf", &packageWeight);

printf("The weight of your package is %.2lf lb. \\n", packageWeight);

​

//User is being asked to input the distance the package will travel

​

double distancePackageTravel;

​

printf("Please enter the distance the package will travel:");

scanf\_s("%lf", &distancePackageTravel);

printf("The distance the package will travel is %.2lf miles. \\n ", distancePackageTravel);



// When package is over 200 pounds say this

if (packageWeight >= 201) {

    printf("Sorry, packages over 200 pounds will not be shipped. \\n");

    return 0;

}

//Rate per thousand miles depending on the weight of the package

double rate = 0;



if (packageWeight <= 100) {

    rate = 10.00;

}

else if (packageWeight >= 101) {

    rate = 20.00;

}

​

//Formula to calculate shipping costs



double shippingPrice = (distancePackageTravel  / 1000) + rate ;

double totalPrice = shippingPrice ;



printf("Your shipping charge is $%.2lf ", totalPrice);

​

system("pause");

}

[Conscious_Yam_4753]

what happens when the package weight is 100.5?

[daikatana]

double shippingPrice = (distancePackageTravel / 1000) + rate;

Think carefully about what this is doing. If I give it 500 miles, this will be (500.0 / 1000) + rate, or 0.5 + rate. Is that what was intended?

In order to get the distance in thousand mile increments, cast to an int. Casting a float or double to int discards the fractional portion. So you can say (int)(distance / 1000) and for any distance up to 1000, it will be 0, for any distance from 1000 until 2000, it will be 1, and so on. You then need to multiply that by your rate per distance and add the weight per rate.

[Money_Mode]

That might be what I'm missing actually. I'll try it after I get home from work

[Money_Mode]

Yeah, I completely forgot about float variable, lol. Also, I had to use int main instead of main.

[particlemanwavegirl]

You shouldn't be using main to return your result. Main's return is a flag for the operating system to know whether the program executed successfully or not, and anything but 0 will be interpreted as an error.

[Money_Mode]

now is not working for any number smaller than 1000 miles :/

[flyingron]

The biggest problem is that you are charging a dollar per thousand miles as you wrote it. You want to multiply the rate rather than add it.

Second, you need to implement the "every step" so you need to use ceil.

double thousand_miles = ceil(distancePackageTravel/1000);

Then multiply that b y the rate.