Builder C++ использование random

b[i] = random(100 * (random(3) -1));

b[i] = rand()%(100 * (rand()%(3) -1));

b[i] = random(100 * (random(3) -1));

b[i] = random(100 * (random(3) +1));

b[i] = rand()%(100 *abs (rand()%3 -1));

include "stdafx.h"
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>
 
 
 
float GetAvg(int*, int);
void PrintArray(int*, int);
 
void main()
{
system("cls");// аналог clrscr() в Visual Studio
 
  int n;
  int *b, *pos, *neg;
  int plen = 0, nlen = 0;
  float pavg, navg;
printf(" Input N :");
scanf("%i", &n);
 
b =   (int*)malloc(n * sizeof(int));
pos = (int*)malloc(n * sizeof(int));
neg = (int*)malloc(n * sizeof(int));
 
srand(time(0));
for (int i = 0; i<n; i++)
{
 b[i] = rand()%(100 * rand()%((3) -1));//
}
 
for ( i = 0; i < n; i++)//
{
  if (b[i] > 0)
  {
   pos[plen++] = b[i];
   continue;
  }
  if (b[i] < 0)
  {
   neg[nlen++] = b[i];
   continue;
  }
}
 
printf("\nArray:\n");
PrintArray(b, n);
 
printf("\n\nArray of positive elements:\n");
PrintArray(pos, plen);
 
printf("\n\nArray of negative elements:\n");
PrintArray(neg, nlen);
 
printf("\n\nAverage of positive elements = %f", pavg = GetAvg(pos, plen));
printf("\nAverage of negative elements = %f" , navg = GetAvg(neg, nlen));
 
if (fabs(pavg) > fabs(navg))
{
  printf("\n|ABS(pos)| > |ABS(neg)|");
}
else if (fabs(pavg) < fabs(navg))
{
  printf("\n|ABS(pos)| < |ABS(neg)|");
}
 
 
printf("\n\nPress any key to quit");
getch();
free(b);
free(pos);
free(neg);
}
 
 
float GetAvg(int *a, int len)
{
float avg = 0;
for (int i=0; i<len;i++)
{
   avg += a[i];
}
   if (avg != 0)
   avg /= len;
 
 
   return avg;
}
 
 
void PrintArray(int *a, int len)
{
   for (int i=0; i<len;i++)
{
   printf("%i", a[i]);
}
}

b[i]=rand()%201-100;

b[i] = RandomRange(-100, 101);