currency conversion using switch

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

```//	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;
const double yuanToDollar = 6.63;
const double kronarToDollar = 8.44;

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, yuan = yu, kronar = k): \n";
cin >> dollar >> currency;

switch (currency)
{
case 'y':
if (dollar*yenToDollar <= 1)
{
cout << dollar << " dollar is " << dollar*yenToDollar << " yen";
}
else
{
cout << dollar << " dollars are " << dollar*yenToDollar << " yen\n";
}
break;
case 'e':
if (dollar*euroToDollar <= 1)
{
cout << dollar << " dollar is " << dollar*euroToDollar << " euro\n";
}
else
{
cout << dollar << " dollars are " << dollar*euroToDollar << " euros\n";
}
break;
case 'p':
if (dollar*poundToDollar <= 1)
{
cout << dollar << " dollar is " << dollar*poundToDollar << " pound\n";
}
else
{
cout << dollar << " dollars are " << dollar*poundToDollar << " pounds\n";
}
break;
case 'yu':
if (dollar*yuanToDollar <= 1)
{
cout << dollar << " dollar is " << dollar*yuanToDollar << " yuan\n";
}
else
{
cout << dollar << " dollars are " << dollar*yuanToDollar << " yuans\n";
}
break;
case 'k':
if (dollar*kronarToDollar <= 1)
{
cout << dollar << " dollar is " << dollar*kronarToDollar << " kronar\n";
}
else
{
cout << dollar << " dollars are " << dollar*kronarToDollar << " kronars\n";
}
break;
default:
cout << "I dont know what " << currency << " for an currency is\n";
break;
}

keep_window_open();
}
```
```Output:
Please enter an amount of dollar(s) you want to convert,
followed by the desired conversion currency (yen = y, euro = e, pound = p, yuan = yu, kronar = k):
130 p
130 dollars are 98.8 pounds
Please enter a character to exit```

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