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C++ Data Types

bookChallenge: 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.

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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.

  1. Use the existing function calculatePayment, which has a return type of int and two parameters:
    • double distance_km — traveled distance.
    • int rate_per_km — price per kilometer.
  2. Multiply distance_km by 1 to convert it to an int and assign the result to the variable distance_km_int.
  3. Declare a type for payment_exact that should store an integer value.
  4. Multiply the distance by the rate per kilometer and assign the result to payment_exact.
  5. Return the result.

Løsning

solution.cpp

solution.cpp

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Sektion 1. Kapitel 3
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bookChallenge: Division int and double

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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.

Opgave

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.

  1. Use the existing function calculatePayment, which has a return type of int and two parameters:
    • double distance_km — traveled distance.
    • int rate_per_km — price per kilometer.
  2. Multiply distance_km by 1 to convert it to an int and assign the result to the variable distance_km_int.
  3. Declare a type for payment_exact that should store an integer value.
  4. Multiply the distance by the rate per kilometer and assign the result to payment_exact.
  5. Return the result.

Løsning

solution.cpp

solution.cpp

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Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 3
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single

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