Challenge: Division int and double
We will not stop on most operations since they work as expected. Instead, let's look at the reasons behind the incorrect result obtained from the division operation. Those are explained in a video below:
It's not just a problem limited to division. When you use operators such as +
, -
, *
, or /
on variables of certain types, the resulting value will have the same type as the operands.
It's important to be mindful of these possibilities and take them into account.
Swipe to start coding
Imagine you're building a taxi meter program: the GPS gives a fractional distance (12.7 km), but the meter rounds it down to a whole number. You need to write a function that calculates the customer's fare.
- Use the existing function
calculatePayment
, which has a return type ofint
and two parameters:double distance_km
— traveled distance.int rate_per_km
— price per kilometer.
- Multiply
distance_km
by 1 to convert it to anint
and assign the result to the variabledistance_km_int
. - Declare a type for
payment_exact
that should store an integer value. - Multiply the distance by the rate per kilometer and assign the result to
payment_exact
. - Return the result.
Oplossing
solution.cpp
Bedankt voor je feedback!
single
Vraag AI
Vraag AI
Vraag wat u wilt of probeer een van de voorgestelde vragen om onze chat te starten.
Can you explain how to ensure the result of division is a floating-point number in C++?
What are some common mistakes beginners make with type conversion in C++?
Can you give more examples of type-related issues with arithmetic operations?
Awesome!
Completion rate improved to 4.35
Challenge: Division int and double
Veeg om het menu te tonen
We will not stop on most operations since they work as expected. Instead, let's look at the reasons behind the incorrect result obtained from the division operation. Those are explained in a video below:
It's not just a problem limited to division. When you use operators such as +
, -
, *
, or /
on variables of certain types, the resulting value will have the same type as the operands.
It's important to be mindful of these possibilities and take them into account.
Swipe to start coding
Imagine you're building a taxi meter program: the GPS gives a fractional distance (12.7 km), but the meter rounds it down to a whole number. You need to write a function that calculates the customer's fare.
- Use the existing function
calculatePayment
, which has a return type ofint
and two parameters:double distance_km
— traveled distance.int rate_per_km
— price per kilometer.
- Multiply
distance_km
by 1 to convert it to anint
and assign the result to the variabledistance_km_int
. - Declare a type for
payment_exact
that should store an integer value. - Multiply the distance by the rate per kilometer and assign the result to
payment_exact
. - Return the result.
Oplossing
solution.cpp
Bedankt voor je feedback!
single