Noise problems

I need to generate clouds for my 2d game made with c++ and sdl, and I found this site: http://www.animeimaging.com/asp/PerlinNoise.aspx

I took there code and just converted it over, but when I call PerlinNoise(), all that I get is "Pure" Noise, nothing cloudlike. I can't figure out what the problem is, since I just copied pretty much. Thanks, bye.

Code:

void PerlinNoise() { Slock(screen); for (x = 0; x < 256; x++) { for (y = 0; y < 256; y++) { float temp = FinalNoise(x, y); temp = temp*0.5f + 0.5f; if(temp<0) temp = 0.0f; if(temp>1) temp = 1.0f; Uint8 fin = (int)(temp*255.0f); DrawPixel(screen, x, y, fin, fin , fin); } } Sulock(screen); } float Noise(int X, int Y) { int n = x + y * 57; n = (n<<13) ^ n; return (float)( 1.0 - ( (n * (n * n * 15731 + 789221) + 1376312589) & 0x7fffffff ) / 1073741824.0); } float Interpolate(float x, float y, float a) { float fac1 = 3*pow(1-a, 2) - 2*pow(1-a,3); float fac2 = 3*pow(a, 2) - 2*pow(a, 3); return x*fac1 + y*fac2; } float GetValue(float x, float y) { int Xint = (int)x; int Yint = (int)y; float Xfrac = x - Xint; float Yfrac = y - Yint; float x0y0 = Noise(Xint, Yint); float x1y0 = Noise(Xint+1, Yint); float x0y1 = Noise(Xint, Yint+1); float x1y1 = Noise(Xint+1, Yint+1); float v1 = Interpolate(x0y0, x1y0, Xfrac); float v2 = Interpolate(x0y1, x1y1, Xfrac); return Interpolate(v1, v2, Yfrac); } float Smooth_Noise(int x, int y) { float corners = ( Noise(x-1, y-1) + Noise(x+1, y-1) + Noise(x-1, y+1) + Noise(x+1, y+1) ) / 16.0f; float sides = ( Noise(x-1, y) +Noise(x+1, y) + Noise(x, y-1) + Noise(x, y+1) ) / 8.0f; float center = Noise(x, y) / 4.0f; return corners + sides + center; } float FinalNoise(float x, float y) { float P = 0.5f; int octaves = 4; float total = 0.0f; int freq = 1; float pers = 1; for(int i=0; i<octaves; i++) { total += GetValue(x*freq,y*freq) * pers; freq *= 2; pers *= P; } return total; }