Sams Teach Yourself C in 21 Days

54: hours += 1;

55: while (hours >= 24 )

56: {

57: hours -= 24;

58: }

59: }

60:

61: // Add 1 to the number of minutes

62: //--------------------------------

63: void time::add_minute(void)

64: {

65: minutes += 1;

66: while (minutes >= 60)

67: {

68: add_hour();

69: minutes -= 60;

70: }

71: }

72:

73: // Add 1 to the number of seconds

74: //--------------------------------

75: void time::add_second(void)

76: {

77: seconds += 1;

78: while (seconds >= 60)

79: {

80: add_minute();

81: seconds -= 60;

82: }

83: }

Start time: 7:10:15

End time: 11:20:30

Start time: 8:11:16

New end time: 12:21:31

Although this listing is different from the previous listing, it accomplishes the

same end results. This listing is, however, more object oriented. Looking at lines

5–16, you see that the timestructure has been defined. In this example, in lines 12–15 of

thetimestructure, you can see that the add...functions and the print_time()function

have been declared. Note that these are inside of the structure. It is this internal declara-

tion that makes these functions members of the timestructure, just as the data members

in lines 7–9 are members of the timestructure.

672 Bonus Day 3

LISTINGB3.3 continued

OUTPUT

ANALYSIS

38 448201x-Bonus3 8/13/02 11:19 AM Page 672