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carlos de la Barrera
NA
1
0
Counting one problem - a BitString problem
Oct 29 2008 6:23 AM
Hell every one, I'm Carlos, new in this corner. architect and completely fun of programming.
I have a little problem to generate random numbers.
the thing that I want to resolve consist in to know the elements (1 or 0) in a bitstring of 250 elements. to do that I'm generating a new bitstring and know what it is my probability of rightly (50%) aprox. then I generate a new bitstring (with the same function) and try to compare if my porcent its, better or not, and continue doing the same thing until find the complete bitstring.
But... when I generate the second bitstring return me the same porcent of the first one. I thought the problem it's related with the seed in the rundomnumber.
I leave my code.
best to all
namespace BitString_Problem
{
class BitString
{
static void Main()
{
//simple array to store and compare the C.
int[] arrC = new int[2];
//define la primera tira.
int[] arrO = new int[250];
int[] arrT = new int[250];
int[] arrT2 = new int[250];
//return the bitstring to find!!!
arrO = GenBitString();
arrT = AdaptativeGen();
//funciĆ³n para calcular la cantidad de aciertos
int C = myfuncCorresponding(arrO, arrT);
//generacion para comparar.
arrT2 = AdaptativeGen();
int C2 = myfuncCorresponding(arrO, arrT2);
Console.WriteLine(C);
Console.WriteLine(C2);
Console.ReadLine();
}
//random bitString of 1 and 0.
static int[] GenBitString()
{
int[] G = new int[250];
Random r = new Random(DateTime.Now.Millisecond);
for (int i = 0; i <= G.GetUpperBound(0); i++)
{
double rnd = r.NextDouble() * DateTime.Now.Millisecond;
if (rnd < (DateTime.Now.Millisecond * 0.5))
{
G[i] = 0;
}
else
{
G[i] = 1;
}
}
return G;
}
static int[] AdaptativeGen()
{
int[] A = new int[250];
Random randNumber = new Random();
for (int i = 0; i <= A.GetUpperBound(0); i++)
{
double Valrandom = randNumber.NextDouble();
if (Valrandom < 0.5)
{
A[i] = 0;
}
else
{
A[i] = 1;
}
}
return A;
}
static int myfuncCorresponding(int[] O, int[] T)
{
int Ncounter = 0;
for (int i = 0; i <= O.GetUpperBound(0); i++)
{
if (O[i] == T[i])
{
Ncounter = Ncounter + 1;
}
}
return Ncounter;
}
}
}
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