Challenge: Arithmetic Operations
Setting the precision
As you already should know you can perform basic data manipulation using arithmetic operators such as addition (+), subtraction (-), division (/), and multiplication (*). Additionally, the modulus operator (%) calculates the remainder of a division.
main.cpp
123456789#include <iostream> #include <iomanip> int main() { // Uncomment to see the difference // std::cout << std::fixed; std::cout << std::setprecision(5) << 15.125 * 0.8309 << std::endl; }
In the example above, floating-point results may occasionally be produced during calculations. To manage the precision of these results, you can use std::setprecision in combination with std::fixed. This allows you to control the number of digits displayed after the decimal point, ensuring consistent precision in your output.
Note
Without
std::fixed,std::setprecisioncontrols the total number of digits displayed, including both before and after the decimal points. Withstd::fixed, the number is displayed in fixed-point notation, keeping the decimal point in a fixed position.
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You have a variable dollars that stores an amount in US dollars. Your task is to convert this amount to euros and display the result with two decimal places.
All the code should be implemented inside the convertToEuro function.
- Initialize the variable
ratewith the value 0.94. - Assign to the existing variable
eurosthe result of multiplyingdollarsbyrate. - Use
std::fixedto ensure that only digits after the decimal point are displayed. - Use
std::setprecisionto display the result with exactly two decimal places.
Рішення
solution.cpp
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Can you show me an example of using std::setprecision and std::fixed?
What happens if I use std::setprecision without std::fixed?
How do I include the necessary headers to use std::setprecision?
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Completion rate improved to 4.35Challenge: Arithmetic Operations
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Setting the precision
As you already should know you can perform basic data manipulation using arithmetic operators such as addition (+), subtraction (-), division (/), and multiplication (*). Additionally, the modulus operator (%) calculates the remainder of a division.
main.cpp
123456789#include <iostream> #include <iomanip> int main() { // Uncomment to see the difference // std::cout << std::fixed; std::cout << std::setprecision(5) << 15.125 * 0.8309 << std::endl; }
In the example above, floating-point results may occasionally be produced during calculations. To manage the precision of these results, you can use std::setprecision in combination with std::fixed. This allows you to control the number of digits displayed after the decimal point, ensuring consistent precision in your output.
Note
Without
std::fixed,std::setprecisioncontrols the total number of digits displayed, including both before and after the decimal points. Withstd::fixed, the number is displayed in fixed-point notation, keeping the decimal point in a fixed position.
Swipe to start coding
You have a variable dollars that stores an amount in US dollars. Your task is to convert this amount to euros and display the result with two decimal places.
All the code should be implemented inside the convertToEuro function.
- Initialize the variable
ratewith the value 0.94. - Assign to the existing variable
eurosthe result of multiplyingdollarsbyrate. - Use
std::fixedto ensure that only digits after the decimal point are displayed. - Use
std::setprecisionto display the result with exactly two decimal places.
Рішення
solution.cpp
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