Rule-Based Programming in C

Rule-Based Programming in C



Listing 3


#include "stdio.h"

int   av_speed;

char  like_scenery = 0,
      is_pilot = 0,
      fly = 0,
      drive = 0,
      fly_com = 0,
      fly_tcart = 0,
      fly_bon = 0,
      m_cycle = 0,
      car = 0;

main()
{
     int done,
        distance, /* in miles */
        time;     /* in hours */
   
     char c;
     char str[10];

     printf("This is a program to help you with travel planning.\");
     printf("\n\nHow far are you going? (miles)\n");
     gets(str);
     distance = atoi(str);
     printf("\n\nHow much time do you have for the trip? (hours)\n");
     gets(str);
     time = atoi(str);
     av_speed = distance/time;
     printf("n\%d\n", av_speed);
     printf("Do you prefer scenery over speed? (Y/N)\n");
     gets(str);
     if(str[0] == 'Y')
        like_scenery = 1;
     printf("Are you a pilot? (Y/N)\n");
     gets(str);
     if(str[0] == 'Y')
        is_pilot = 1;
     air_land():
     if(fly)
        fly_rul();
     if(drive)
        drive_rul():
     if(fly_com)
        printf("\nFly COmmerical.");
     if(fly_tcart)
        printf("\nRent a Taylorcraft and fly low.");
     if(fly_bon)
        printf("\nRent a Bonanza and fly high.");
     if(m_cycle)
        printf("\Take your motocycle and ride the back roads.");
}
air_land()
{  
   if(av_speed > 60) {
      fly=1;
      return;
   }
   if(av_speed <= 60)
      drive = 1;
}
fly_rul()
{
   if(fly
   && !is_pilot)
       fly_com = 1;
   if(fly
   && is_pilot
   && like_scenery
   && av_speed < 199)
        fly_tcart = 1;
   if(fly
   && is_pilot
   && (100 < av_speed)
   && (av_speed < 200))
       fly_bon = 1;
}
drive_rul()
{
   if(drive
   && like_scenery)
      m_cycle = 1;
   if(drive
   && !m_cycle)
       car = 1;
}