change simulation

#include <iostream>
#include <stdlib.h>
#include <time.h>
#include <ctime>
#include <cstdlib>
#include <windows.h>

#define FLT_EPSILON     1.192092896e-07F
#define RAND_MAX 0x7fff

using namespace std;

int number(int from, int to)
{
    if (from > to)
    {
        int tmp = from;

        from = to;
        to = tmp;
    }

    int returnValue = 0;

    if ((to - from + 1) != 0)
    {
        returnValue = ((rand() % (to - from + 1)) + from);
    }

    return returnValue;
}

int MINMAX(int min, int value, int max)
{
    register int tv;

    tv = (min > value ? min : value);
    return (max < tv) ? max : tv;
}

double uniform_random(double a, double b)
{
    return rand() / (RAND_MAX + 1.f) * (b - a) + a;
}

float gauss_random(float avg, float sigma)
{
    static bool haveNextGaussian = false;
    static float nextGaussian = 0.0f;

    if (haveNextGaussian)
    {
        haveNextGaussian = false;
        return nextGaussian * sigma + avg;
    }
    else
    {
        double v1, v2, s;
        do {
            //v1 = 2 * nextDouble() - 1;   // between -1.0 and 1.0
            //v2 = 2 * nextDouble() - 1;   // between -1.0 and 1.0
            v1 = uniform_random(-1.f, 1.f);
            v2 = uniform_random(-1.f, 1.f);
            s = v1 * v1 + v2 * v2;
        } while (s >= 1.f || fabs(s) < FLT_EPSILON);
        double multiplier = sqrtf(-2 * logf(s) / s);
        nextGaussian = v2 * multiplier;
        haveNextGaussian = true;
        return v1 * multiplier * sigma + avg;
    }
}

int main()
{
    int iSkillBonus, iNormalHitBonus;
    unsigned long long counter = 0;
    srand(time(NULL));
    for (;;)
    {
        iSkillBonus = MINMAX(-30, (int)(gauss_random(0, 5) + 0.5f), 30);
        if (abs(iSkillBonus) <= 20)
            iNormalHitBonus = -2 * iSkillBonus + abs(number(-8, 8) + number(-8, 8)) + number(1, 4);
        else
            iNormalHitBonus = -2 * iSkillBonus + number(1, 5);

        counter += 1;
        if (iNormalHitBonus >= 55) ////if normal hit bonus is 55 or higher, the loop will stop
            break;

        Sleep(1); //how long you will wait between draws


        //you can delete this if you want to make it faster
        cout << "normal hit bonus: " << iNormalHitBonus << endl;
        cout << "skill bonus: " << iSkillBonus << endl;
        //

    }

    cout << "you've used " << counter << " changes" << endl;

    system("pause");
    return 0;
}