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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 //This is the implementation file dtimecpp of the class DigitalTime //The interface for the class DigitalTime is in the header file dtimeh #include <iostream> #include <cctype> #include <cstdlib> using namespace std; #include "dtimeh" //Uses iostream and cstdlib: 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;
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43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 hour = (hour + hourAdjustment)%24; } void DigitalTime::advance(int hoursAdded, int minutesAdded) { hour = (hour + hoursAdded)%24; advance(minutesAdded); } bool operator ==(const DigitalTime& time1, const DigitalTime& time2) { return (time1hour == time2hour && time1minute == time2minute); } //Uses iostream: ostream& operator <<(ostream& outs, const DigitalTime& theObject) { outs << theObjecthour << : ; if (theObjectminute < 10) outs << 0 ; outs << theObjectminute; return outs; } //Uses iostream: istream& operator >>(istream& ins, DigitalTime& theObject) { DigitalTime::readHour(theObjecthour); DigitalTime::readMinute(theObjectminute); return ins; } int DigitalTime::digitToInt(char c) { return ( int(c) - int( 0 ) ); } //Uses iostream, cctype, and cstdlib: void DigitalTime::readMinute(int& theMinute) { char c1, c2; cin >> c1 >> c2; if (!(isdigit(c1) && isdigit(c2))) { cout << "Error: illegal input to readMinute\n"; exit(1); }
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85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 theMinute = digitToInt(c1)*10 + digitToInt(c2); if (theMinute < 0 || theMinute > 59) { cout << "Error: illegal input to readMinute\n"; exit(1); } } //Uses iostream, cctype, and cstdlib: void DigitalTime::readHour(int& theHour) { char c1, c2; cin >> c1 >> c2; if ( !( isdigit(c1) && (isdigit(c2) || c2 == : ) ) ) { cout << "Error: illegal input to readHour\n"; exit(1); } if (isdigit(c1) && c2 == : ) { theHour = DigitalTime::digitToInt(c1); } else //(isdigit(c1) && isdigit(c2)) { theHour = DigitalTime::digitToInt(c1)*10 + DigitalTime::digitToInt(c2); cin >> c2; //discard : if (c2 != : ) { cout << "Error: illegal input to readHour\n"; exit(1); } } if (theHour == 24) theHour = 0; //Standardize midnight as 0:00 if ( theHour < 0 || theHour > 23 ) { cout << "Error: illegal input to readHour\n"; exit(1); } }
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Any le that uses the class DigitalTime must contain the include directive
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#include "dtimeh"
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Thus, both the implementation le and the program le must contain the include directive that names the interface le The le that contains the program (that is, the le that contains the main function) is often called the application le or driver le Display 113 contains an application le with a very simple program that uses and demonstrates the DigitalTime class The exact details of how to run this complete program, which is contained in three les, depend on what system you are using However, the basic details are the same for all systems You must compile the implementation le and you must compile the application le that contains the main function You do not compile the interface le, which in this example is the le dtimeh given in Display 111 You do not need to compile the interface le because the compiler thinks the contents of this interface le are already contained in each of the other two les Recall that both the implementation le and the application le contain the directive
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