Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 9 Exercise 14
Using std_lib_facilities.h by Bjarne Stroustrup.
[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PPP
// Chapter 9 Exercise 14
#include "std_lib_facilities.h"
class Money {
private:
long int amount;
public:
//constructors
Money(double);
//non-modifying operations
long int get_amount() { return amount; }
double get_amount_decimal();
void print() { cout << get_amount_decimal() << endl; }
//modifying operations
};
Money::Money(double a) {
double temp_d0 = a;
temp_d0 *= 100;
int temp_i = (int)temp_d0;
double difference = temp_d0 – temp_i;
if (difference >= 0.5) {
temp_i++;
}
amount = temp_i;
}
double Money::get_amount_decimal() {
return double(amount) / 100;
}
void read_value(string& c, double& i) {
string check;
double input;
if (cin >> input) {
i = input;
}
else {
cin.clear();
cin >> check;
c = check;
if (check != "x") {
cout << "Invalid input: " << check << endl;
}
}
}
void calculate() {
while (true) {
string check;
double input;
cout << "Enter dollar amount as float: " << endl;
read_value(check, input);
if (check == "x") {
break;
}
else {
Money dollar(input);
dollar.print();
}
}
}
int main()
try
{
calculate();
keep_window_open();
}
catch (runtime_error e) {
cout << e.what() << endl;
keep_window_open();
}
catch (…) {
cout << "Exiting" << endl;
keep_window_open();
}
[/code]
Output: Enter dollar amount as float: 34.5346 34.53 Enter dollar amount as float: 34.566 34.57 Enter dollar amount as float:
