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 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 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139
|
//Implements file dtime.cpp (Your system may require some
//suffix other than .cpp): This is the IMPLEMENTATION of the ADT DigitalTime.
//The interface for the class DigitalTime is in the header file dtime.h.
#include<iostream>
#include<cctype>
#include<cstdlib>
#include "dtime.h"
using namespace std;
//There FUNCTION DECLARATIONS are for use in the definition of
//the overloaded input operator >>:
void read_hour(istream& ins, int& the_hour);
//PRecondition: Next input in the stream ins is a time in 24-hour notation,
//like 9:45 or 14:45.
//Postcondition: thehour has been set to the hour part of the time.
//The colon has been discarded and the next input to be read is the minute,.
void read_minute(istream& ins, int& the_minute);
//Reads the minute from the stream ins after read_hour has been read the hour.
int digit_to_int(char c);
//Preconditon: c is one of the digits '0' through '9'.
//Returns the integer for the digit; for example, digit_to_int('3') returns 3.
bool operator==(const DigitalTime& time1, const DigitalTime& time2)
{
return (time1.hour == time2.hour && time1.minute == time2.minute);
}
//Uses iostream and cstdlib;
DigitalTime::DigitalTime(int the_hour, int the_minute)
{
if (the_hour < 0 || the_hour > 23 || the_minute < 0 || the_minute > 59)
{
cout << "Illegal argument to DigitalTime constructor.";
exit(1);
}
else
{
hour = the_hour;
minute = the_minute;
}
}
DigitalTime::DigitalTime() : hour(0), minute(0)
{
//Body intentionally empty.
}
void DigitalTime::advance(int minutes_added)
{
int gross_minutes = minute + minutes_added;
minute = gross_minutes % 60;
int hour_adjustment = gross_minutes / 60;
hour = (hour + hour_adjustment) % 24;
}
void DigitalTime::advance(int hours_added, int minutes_added)
{
hour = (hour + hours_added) % 24;
advance(minutes_added);
}
//Uses iostream
ostream& operator<<(ostream& outs, const DigitalTime& the_object)
{
outs << the_object.hour << ':';
if (the_object.minute < 10)
outs << '0';
outs << the_object.minute;
return outs;
}
//Uses iostream
istream& operator>>(istream& ins, DigitalTime& the_object)
{
read_hour(ins, the_object.hour);
read_minute(ins, the_object.minute);
return ins;
}
int digit_to_int(char c)
{
return ( static_cast<int>(c) - static_cast<int>('0'));
}
//Uses iostream, cctype and cstdlib
void read_minute(istream& ins, int& the_minute)
{
char c1, c2;
ins >> c1 >> c2;
if ( !( isdigit(c1) && (isdigit(c2) || c2 == ':' )))
{
cout << "Error illegal input to read_minute\n";
exit(1);
}
the_minute = digit_to_int(c1) * 10 + digit_to_int(c2);
if ( the_minute < 0 || the_minute > 59)
{
cout << "Error illegal input to read_minute\n";
exit(1);
}
}
//Uses iostream, cctype, and cstdlib:
void read_hour(istream& ins, int& the_hour)
{
char c1, c2;
ins >> c1 >> c2;
if ( !( isdigit(c1) && (isdigit(c2) || c2 == ':' )))
{
cout << "Error illegal input to read_hour\n";
exit(1);
}
if ( isdigit(c1) && c2 == ':')
{
the_hour = digit_to_int(c1);
}
else //(isdigit(c1) && isdigit(c2))
{
the_hour = digit_to_int(c1) * 10 + digit_to_int(c2);
ins >> c2; //discard ':'
if (c2 != ':')
{
cout << "Error illegal input to read_hour\n";
exit(1);
}
}
if ( the_hour < 0 || the_hour > 23 )
{
cout << "Error illegal input to read_hour\n";
exit(1);
}
}
|