# dollar currency converter

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Using std_lib_facilities.h by Bjarne Stroustrup.

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP

#include "std_lib_facilities.h"

int main()
{
const double yenToDollar = 101.10;
const double euroToDollar = 0.89;
const double poundToDollar = 0.76;

double dollar = 1;
char currency = ‘a’;

cout << "Please enter an amount of dollar(s) you want to convert,\nfollowed by the desired conversion currency (yen = y, euro = e, pound = p): \n";
cin >> dollar >> currency;

if (currency == ‘y’)
{
if (dollar*yenToDollar <= 1)
{
cout << dollar << " dollar is " << dollar*yenToDollar << " yen";
}
else
{
cout << dollar << " dollars are " << dollar*yenToDollar << " yen\n";
}
}
else if(currency == ‘e’)
{
if (dollar*euroToDollar <= 1)
{
cout << dollar << " dollar is " << dollar*euroToDollar << " euro\n";
}
else
{
cout << dollar << " dollars are " << dollar*euroToDollar << " euros\n";
}
}
else if (currency == ‘p’)
{
if (dollar*euroToDollar <= 1)
{
cout << dollar << " dollar is " << dollar*poundToDollar << " pound\n";
}
else
{
cout << dollar << " dollars are " << dollar*poundToDollar << " pounds\n";
}
}
else
{
cout << "I dont know what " << currency << " for an currency is\n";
}

keep_window_open();
}
[/code]

```Output:
Please enter an amount of dollar(s) you want to convert,
followed by the desired conversion currency (yen = y, euro = e, pound = p):
130 y
130 dollars are 13143 yen
Please enter a character to exit```