between.c

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#include "standard.h"
#include "error.h"

/*
 * Function to compute if another number is between two numbers on a mod 32 scale 
 */

int between(int x,int low, int high)
/* 
 * returns 1 if x is between low and high on a mod 32 scale (ie. circular)
 * returns 0 if not
 * ie. 5 is between 30 and 6.
 *     7 is not between 30 and 6
 */
{
  if (high < low)
    return (x>low || x<high);
  else 
    return (x<high && x>low);
}

int minus(int a, int b)
/*
 * returns a - b on a mod 32 scale.  
 * ie. minus(5,4) == 1
 *     minus(5,6) == 31
 */
{
  if ((a>31) || (b>31) || (a<0) || (b<0))
    error("minus","Non mod 32 numbers passed to mod 32 minus routine");
  if(b<=a)
    return (a-b);
  else
    return (32-(b-a));
}

#if(0)
int main()
{
  int x, y;
  while (1) {
    printf("Enter x, y: ");
    scanf("%d %d",&x,&y);
    printf("x - y = %d",minus(x,y));
  }
}
#endif

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