Aprenda 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


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#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::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.

Tarefa

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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 rate with the value 0.94.
Assign to the existing variable euros the result of multiplying dollars by rate.
Use std::fixed to ensure that only digits after the decimal point are displayed.
Use std::setprecision to display the result with exactly two decimal places.

Solução

solution.cpp

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Seção 1. Capítulo 2

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Can you show me an example of using std::setprecision and std::fixed?

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