fig06_01.cpp

来自「经典vc教程的例子程序」· C++ 代码 · 共 56 行

// Fig. 6.1: fig06_01.cpp
// Create a structure, set its members, and print it.
#include <iostream.h>

struct Time {    // structure definition
   int hour;     // 0-23
   int minute;   // 0-59
   int second;   // 0-59
};

void printMilitary( const Time & );  // prototype
void printStandard( const Time & );  // prototype

int main()
{
   Time dinnerTime;    // variable of new type Time

   // set members to valid values
   dinnerTime.hour = 18;
   dinnerTime.minute = 30;
   dinnerTime.second = 0;

   cout << "Dinner will be held at ";
   printMilitary( dinnerTime );
   cout << " military time,\nwhich is ";
   printStandard( dinnerTime );
   cout << " standard time.\n";

   // set members to invalid values
   dinnerTime.hour = 29;
   dinnerTime.minute = 73;
   
   cout << "\nTime with invalid values: ";
   printMilitary( dinnerTime );
   cout << endl;
   return 0;
}

// Print the time in military format
void printMilitary( const Time &t )
{
   cout << ( t.hour < 10 ? "0" : "" ) << t.hour << ":"
        << ( t.minute < 10 ? "0" : "" ) << t.minute;
}

// Print the time in standard format
void printStandard( const Time &t )
{
   cout << ( ( t.hour == 0 || t.hour == 12 ) ? 
             12 : t.hour % 12 )
        << ":" << ( t.minute < 10 ? "0" : "" ) << t.minute
        << ":" << ( t.second < 10 ? "0" : "" ) << t.second
        << ( t.hour < 12 ? " AM" : " PM" );
}