[SOLVED] CS c++ // From Walter Savitch book resources Absolute C++

// From Walter Savitch book resources Absolute C++

//This is the implementation file: dtime.cpp of the class DigitalTime.
//The interface for the class DigitalTime is in the header file dtime.h.
#include
#include
#include
using std::istream;
using std::ostream;
using std::cout;
using std::cin;
#include dtime.h

// Open the unnamed namesapce.
// Identifiers declared/defined here cannot be referred to outside of this file.
namespace{
int digitToInt(char c){
return ( int(c) int(0) );
}

//Uses iostream, cctype, and cstdlib:
void readMinute(int& theMinute){
char c1, c2;
cin >> c1 >> c2;
if (!(isdigit(c1) && isdigit(c2))){
cout << “Error illegal input to readMinute
“;exit(1);}theMinute = digitToInt(c1)*10 + digitToInt(c2);if (theMinute < 0 || theMinute > 59){
cout << “Error illegal input to readMinute
“;exit(1);}}//Uses iostream, cctype, and cstdlib:void readHour(int& theHour){char c1, c2;cin >> c1 >> c2;
if ( !( isdigit(c1) && (isdigit(c2) || c2 == : ) ) ){
cout << “Error illegal input to readHour
“;exit(1);}if (isdigit(c1) && c2 == ‘:’){theHour = digitToInt(c1);}else {theHour = digitToInt(c1)*10 + digitToInt(c2);cin >> c2; //discard :
if (c2 != :){
cout << “Error illegal input to readHour
“;exit(1);}}if (theHour == 24)theHour = 0; //Standardize midnight as 0:00if ( theHour < 0 || theHour > 23 ){
cout << “Error illegal input to readHour
“;exit(1);}}} // end of unnamed namespace// Beginning of the DTimeSavitch namespace namespace DTimeSavitch{//Uses iostream:istream& operator >>(istream& ins, DigitalTime& theObject){
readHour(theObject.hour);
readMinute(theObject.minute);
return ins;
}

ostream& operator <<(ostream& outs, const DigitalTime& theObject){outs << theObject.hour << ‘:’;if (theObject.minute < 10)outs << ‘0’;outs << theObject.minute;return outs;} bool operator ==(const DigitalTime& time1, const DigitalTime& time2){return (time1.hour == time2.hour && time1.minute == time2.minute);}DigitalTime::DigitalTime(int theHour, int theMinute){if (theHour < 0 || theHour > 24 || theMinute < 0 || theMinute > 59){
cout << “Illegal argument to DigitalTime constructor.”;exit(1);}else{hour = theHour;minute = theMinute;}if (hour == 24)hour = 0; //standardize midnight as 0:00}DigitalTime::DigitalTime( ){hour = 0;minute = 0;}int DigitalTime::getHour( ) const{return hour;}int DigitalTime::getMinute( ) const{return minute;}void DigitalTime::advance(int minutesAdded){int grossMinutes = minute + minutesAdded;minute = grossMinutes%60;int hourAdjustment = grossMinutes/60;hour = (hour + hourAdjustment)%24;}void DigitalTime::advance(int hoursAdded, int minutesAdded){hour = (hour + hoursAdded)%24;advance(minutesAdded);}} // end of DTimeSavitch namespace