c-resources/CPlusPlus20ForProgrammers-m.../examples/ch09/fig09_30-32/Time.cpp

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// Fig. 9.31: Time.cpp
// Time class member-function definitions.
#include <fmt/format.h>
#include <stdexcept>
#include "Time.h" // Time class definition
// Time constructor initializes each data member
Time::Time(int hour, int minute, int second) {
setTime(hour, minute, second);
}
// set new Time value using 24-hour time
Time& Time::setTime(int hour, int minute, int second) {
// validate hour, minute and second
if (hour < 0 || hour >= 24) {
throw std::invalid_argument{"hour was out of range"};
}
if (minute < 0 || minute >= 60) {
throw std::invalid_argument{"minute was out of range"};
}
if (second < 0 || second >= 60) {
throw std::invalid_argument{"second was out of range"};
}
m_hour = hour;
m_minute = minute;
m_second = second;
return *this; // enables cascading
}
// set hour value
Time& Time::setHour(int hour) {
return setTime(hour, m_minute, m_second);
}
// set minute value
Time& Time::setMinute(int minute) {
return setTime(m_hour, minute, m_second);
}
// set second value
Time& Time::setSecond(int second) {
return setTime(m_hour, m_minute, second);
}
// get hour value
int Time::getHour() const {return m_hour;}
// get minute value
int Time::getMinute() const {return m_minute;}
// get second value
int Time::getSecond() const {return m_second;}
// return Time as a string in 24-hour format (HH:MM:SS)
std::string Time::to24HourString() const {
return fmt::format("{:02d}:{:02d}:{:02d}",
getHour(), getMinute(), getSecond());
}
// return Time as string in 12-hour format (HH:MM:SS AM or PM)
std::string Time::to12HourString() const {
return fmt::format("{}:{:02d}:{:02d} {}",
((getHour() % 12 == 0) ? 12 : getHour() % 12),
getMinute(), getSecond(), (getHour() < 12 ? "AM" : "PM"));
}
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