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Currency Converter in C++

Ayush Purawr January 30, 2023

In this article, we will build a simple program for Currency Converter in C++. The user will be able to convert currencies like Dollar, Euro, Pound, and Rupee. This is a console application and very simple to understand as we only use a bunch of conditionals to write the entire program.

Features

Users can convert currency from:

USD to INR, INR to USD, GBP to INR, INR to GBP, INR to EUR, and vice versa
USD to EUR, EUR to USD, USD to GBP, and vice versa
EUR to GBP and vice versa

Code for Currency Converter in C++

We will use Code::Blocks IDE to develop this program. Open the Code::Blocks IDE and create a new project with the name currencyconverter, now in the main.cpp file paste the following code and run it.

#include <iostream>
#include <iomanip>
#include <stdlib.h>
#include <string>
#include <conio.h>
#include <time.h>
#include <string.h>
using namespace std;

using namespace std;

double convert_dollar_to_Rupee(double dollar){
    double rupee = dollar * 81.51;
    return rupee;
}

double convert_Rupee_to_dollar(double rupee){
    double dollar = rupee * 0.012;
    return dollar;
}

double convert_pound_to_Rupee (double pound) {
    double rupee = pound * 113.11;
    return rupee;
}

double convert_Rupee_to_pound (double rupee) {
    double pound = rupee * 0.0088;
    return pound;
}

double convert_euro_to_Rupee (double euro) {
    double rupee = euro * 94.92;
    return rupee;
}

double convert_Rupee_to_euro (double rupee) {
    double euro = rupee * 0.0105;
    return euro;
}

double convert_dollar_to_pound (double dollar) {
    double pound = dollar * 0.73;
    return pound;
}

double convert_pound_to_dollar (double pound) {
    double dollar = pound * 1.37;
    return dollar;
}

double convert_dollar_to_euro ( double dollar) {
    double euro = dollar * 0.86;
    return euro;
}

double convert_euro_to_dollar ( double euro) {
    double dollar = euro * 1.16;
    return dollar;
}

double convert_euro_to_pound ( double euro) {
    double pound = euro * 0.90;
    return pound;
}

double convert_pound_to_euro ( double pound) {
    double euro = pound * 1.11;
    return euro;
}

//used to hold the screen for some seconds
void waiting(unsigned int mseconds)
	{
		clock_t goal = mseconds + clock();
		while (goal > clock());
	}

int main(){
    system("title Currency Converter @copyassignment");
    system("color B0");
    string currency;
    int choice;
    while(true){
    system("cls");
    cout << "\t\t\t<================================================================================>" << endl;
    cout << "\t\t\t|                        WELCOME TO CURRENCY CONVERTER                           |" << endl;
    cout << "\t\t\t|            Please NOTE that the currency value fluctuates frequently           |" << endl;
    cout << "\t\t\t|      So if you find the conversion to be inaccurate, that might be the cause   |" << endl;
    cout << "\t\t\t<================================================================================>" << endl;
    cout << endl;
    cout << endl;
    cout << endl;
    cout << endl;
    cout << "\t\t\tchoose from below options to convert" << endl;
    cout << "\t\t\t [1] Dollar (USD) to Rupee(INR) " << endl;
    cout << "\t\t\t [2] Rupee (INR) to Dollar(USD) " << endl;
    cout << "\t\t\t [3] Pound (GBP) to Rupee (INR) " << endl;
    cout << "\t\t\t [4] Rupee (INR) to Pound (GBP) " << endl;
    cout << "\t\t\t [5] Euro (EUR) to Rupee (INR) " << endl;
    cout << "\t\t\t [6] Rupee (INR) to Euro (EUR) " << endl;
    cout << "\t\t\t [7] Dollar (USD) to Pound (GBP) " << endl;
    cout << "\t\t\t [8] Pound (GBP) to Dollar (USD) " << endl;
    cout << "\t\t\t [9] Dollar (USD) to Euro (EUR) " << endl;
    cout << "\t\t\t [10] Euro (EUR) to Dollar (USD) " << endl;
    cout << "\t\t\t [11] Euro (EUR) to Pound (GBP) " << endl;
    cout << "\t\t\t [12] Pound (GBP) to Euro (EUR) " << endl;
    cout << endl << endl;
    cout << "Enter your choice to convert from one currency to other:\n";
    cin >> choice;

    if(choice == 1){
        double dollar;
        double rupee;
        cout << "Enter dollars to convert to Rupee " << endl;
        cin >> dollar;
        rupee = convert_dollar_to_Rupee(dollar);
        cout << dollar <<" Dollars In Rupee = "<< rupee;
        waiting(4000); //hold the screen for 4 seconds
    }
    else if(choice == 2){
        double dollar;
        double rupee;
        cout << "Enter Rupee to convert to Dollar " << endl;
        cin >> rupee;
        dollar = convert_Rupee_to_dollar(rupee);
        cout << rupee <<" Rupees In Dollar = "<< dollar;
        waiting(4000);
    }
    else if (choice == 3){
        double pound;
        double rupee;
        cout << "Enter Pound to convert to Rupee " << endl;
        cin >> pound;
        rupee = convert_pound_to_Rupee(pound);
        cout << pound <<" Pounds In Rupee = "<< rupee;
        waiting(4000);
    }
    else if(choice == 4){
        double rupee;
        double pound;
        cout << "Enter Rupee to convert to Pound " << endl;
        cin >> rupee;
        pound = convert_Rupee_to_pound(rupee);
        cout << rupee <<" Rupees In Pound = "<< pound;
        waiting(4000);
    }
    else if (choice == 5){
        double euro;
        double rupee;
        cout << "Enter Euro to convert to Rupee " << endl;
        cin >> euro;
        rupee = convert_euro_to_Rupee(euro);
        cout << euro <<" Euro In Rupee = "<< rupee;
        waiting(4000);
    }
    else if(choice == 6){
        double rupee;
        double euro;
        cout << "Enter Rupee to convert to Euro " << endl;
        cin >> rupee;
        euro = convert_Rupee_to_euro(rupee);
        cout << rupee <<" Rupees In Euro = "<< euro;
        waiting(4000);
    }
    else if (choice == 7){
        double dollar;
        double pound;
        cout << "Enter Dollar to convert to Pound " << endl;
        cin >> dollar;
        pound = convert_dollar_to_pound(dollar);
        cout << dollar <<" Dollars In Pound = "<< pound;
        waiting(4000);
    }
    else if(choice == 8){
        double pound;
        double dollar;
        cout << "Enter Pound to convert to Dollar " << endl;
        cin >> pound;
        dollar = convert_pound_to_dollar(pound);
        cout << pound <<" Pounds In Dollar = "<< dollar;
        waiting(4000);
    }
    else if (choice == 9){
        double dollar;
        double euro;
        cout << "Enter Dollar to convert to Euro " << endl;
        cin >> dollar;
        euro = convert_dollar_to_euro(dollar);
        cout << dollar <<" Dollars In Euro = "<< euro;
        waiting(4000);
    }
    else if(choice == 10){
        double euro;
        double dollar;
        cout << "Enter Euro to convert to Dollar " << endl;
        cin >> euro;
        dollar = convert_euro_to_dollar(euro);
        cout << euro <<" Euro In Dollar = "<< dollar;
        waiting(4000);
    }
    else if (choice == 11){
        double euro;
        double pound;
        cout << "Enter Euro to convert to Pound " << endl;
        cin >> euro;
        pound = convert_euro_to_pound(euro);
        cout << euro <<" Euro In Pound = "<< pound;
        waiting(4000);
    }
    else if(choice == 12){
        double pound;
        double euro;
        cout << "Enter Pound to convert to Euro " << endl;
        cin >> pound;
        euro = convert_pound_to_euro(pound);
        cout << pound <<" Pounds In Euro = "<< euro;
        waiting(4000);
    }
    else{
        cout << "Invalid choice, please select between 1 - 12" << endl;
    }
    }
}

Output for Currency Converter in C++

Image Output:

output for Currency Converter in C++

Video Output:

Conclusion

I hope you like this simple program on Currency Converter in C++. You should try to add more currencies to the list of available currencies and you can easily do it by searching on google for the formula to convert from one currency to other and implement it in this program.

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Author: Ayush Purawr