C / C++ / MFC

<br />
static long random_number = 1L;<br />
<br />
// seed our pseudorandom number generator<br />
void SeedRandomNumber ( unsigned int seed )<br />
{<br />
	random_number = (long)seed;<br />
}<br />
<br />
// return a random number in the range [lower, upper]<br />
int GetRandomNumberBetween ( unsigned int lower, unsigned int upper )<br />
{<br />
	return ( ( ( ( random_number = random_number * 214013L + 2531011L ) >> 16 ) & ( upper - lower ) ) + lower );<br />
}<br />

int GetRandomNumberBetween(int nLower, int nUpper){    
 
    int              nTheRandomNumber = 0;
    unsigned int     range, offset;
    float            r;
 
    // assume nothing! (or do a min() max() thing)
    assert( nUpper >= nLower );
 
    // important that range be unsigned
    range = (nUpper - nLower);
 
    // RAND_MAX may be smaller than int32 max, but the point is
    // only to get a number between 0 and 1
    r = (float)rand() / (float)RAND_MAX;
 
    // offset may be 0 if both inputs are the same - which is ok
    offset = (int)(r * range);
 
    nTheRandomNumber = nLower + offset;

    TRACE(_T("nTheRandomNumber = %d\n"), nTheRandomNumber);
    return nTheRandomNumber;
}

unsigned int GetRandInt32() {
    static unsigned x = 0;
    unsigned n = 5;   
    x = (((4*n+1) * x) + 1231) % INT_MAX;
    return x;
}

//get a random number between min and max
#define GetRandom(min, max) ((rand() % (int)(((max) + 1) - (min))) + (min))

TRACE(_T("GetRandom returns %ld\n"),GetRandom(-INT_MAX, INT_MAX));

UINT number = randomMT();
number /= (UINT_MAX / (nUpper - nLower));
number += nLower;

<br />
CString strBytes("ff10ab");<br />
char buffer[2];//buffer to hold each digit of strBytes for conversion<br />
buffer[0] = 0; //null terminator required <br />
int digit;<br />
for(int i=0;i<strBytes.GetLength();i++)<br />
  {	<br />
    buffer[0] = strBytes[i];<br />
    digit = strtol( buffer, 0, 16 ); //you could also use sscanf <br />
    TRACE("Digit %i is %d in decimal, %x in hex\n",i,digit,digit);<br />
  }<br />