Arithmetische Operationen
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.
Without std::fixed, std::setprecision controls the total number of digits displayed, including both before and after the decimal points. With std::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 return the result.
All the code should be implemented inside the convertToEuro function.
- Initialize the variable
ratewith the value 0.94. - Calculate the euro value by multiplying
dollarsbyrate. - Use
std::fixedandstd::setprecision(2)to format the result before returning it. - Return the converted value as a
double.
Lösung
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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.
Without std::fixed, std::setprecision controls the total number of digits displayed, including both before and after the decimal points. With std::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 return the result.
All the code should be implemented inside the convertToEuro function.
- Initialize the variable
ratewith the value 0.94. - Calculate the euro value by multiplying
dollarsbyrate. - Use
std::fixedandstd::setprecision(2)to format the result before returning it. - Return the converted value as a
double.
Lösung
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