Currency Converter: Euros to US Dollars

Currency Converter: Euros to US Dollars in C++

Learn to handle real-world data and floating-point precision by building a practical currency converter that calculates exchange rates.

Logic and Variables

Exchange Rate Constant

Storing the conversion rate as a const double ensures that the mathematical logic remains consistent and easy to update in one place.

Floating-Point Math

Using double instead of int is crucial for financial calculations to preserve the decimal values (cents).

Step-by-Step Objective

Define a constant for the exchange rate (e.g., 1 Euro = 1.08 USD).
Declare double variables for euros and dollars.
Request the amount in Euros from the user using cin.
Calculate the equivalent in Dollars: dollars = euros * rate.

C++ Solution

currency_converter.cpp C++ Beginners

#include <iostream>
using namespace std;

int main() {
    // Current exchange rate constant
    const double EURO_TO_USD = 1.08;
    double euros, dollars;

    cout << "Enter the amount in Euros (€): ";
    cin >> euros;

    // Conversion calculation
    dollars = euros * EURO_TO_USD;

    cout << euros << " Euros is equivalent to " << dollars << " US Dollars ($)." << endl;

    return 0;
}

Console Output:

Enter the amount in Euros (€): 100
100 Euros is equivalent to 108 US Dollars ($).

Financial Logic & Precision