/* randtest */
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
/* In this demo, the drunk starts
at position 4, throws a 7 sided dice to decide which way to go in one
time unit. If the dice comes up 1,2, or 3 he goes right, and if it
comes up 4 or 5 he goes left, and if it comes up 6 or 7 he stands still
in that time unit. If he goes right or left, he throws a five sided die
to decide how many steps to take in that time unit. */

time_t seed;

main()
{
int i, roll, step, position, endposition;
int r;

 seed = time(NULL);
 srand(seed);

 r = rand();  /* This is just to look once at a random number that was generated by rand */
 printf("%d\n", r);

 position = 4;

 for  (i = 1; i <= 20; ++i) {

  printf("roll = %d\n", roll = 1 + rand()%7);
  if (roll <= 3)  {
   step = 1 + rand()%5;
   position = position + step;
   printf(" step and position = %d  %d \n", step, position);}

    else if ((roll > 3) && (roll <= 5))
    position = position - (1 + rand()%5);

  printf("position = %d\n", position);
 }
 endposition = position;
 printf("The end position for this simulation is %d\n", endposition);
}