Re: [Dev-C++] chinese characters

Thanks everybody for yours answers!!!

2009/6/16 <Mat...@bm...>

> Hello Jorge,
>
> Two things I notice are.
>
> 1. In answer to your question about Chinese characters - The rand()
> function will generate a random number between 0 and 32767 (or more
> accurately 0 to RAND_MAX) which you are casting into a char. ASCII printable
> characters reside in the range from 32 to 126.
>
> 2. You are not generating random numbers as you expect because you have not
> set a seed with which to generate random numbers from. Check the function
> srand. The way it stands now, you will produce the same sequence of
> characters each time the program is run. The closest approximation to
> "random" is to use the system clock as a seed as this is different with each
> execution of the program.
>
> void crearArchivo(char* nombreArchivo, int n)
> {
>    ofstream fSalida;
>    fSalida.open(nombreArchivo);
>     srand(time(NULL)); // Set a random seed
>     if(fSalida.is_open())
>    {
>        for(int i=0;i<n;i++)
>        {
>                   char c=(char)(rand() % 94 + 32); //Only generate numbers
> in range 32 to 126
>                 fSalida<<c;
>        }
>    }
>    else
>    {
>        cout<<"el arhivo no se pudo crear";
>    }
>    fSalida.close();
> }
>
> int main(int argc, char *argv[])
> {
>    crearArchivo("nuevo.txt",1000)  ;
>    system("PAUSE");
>    return EXIT_SUCCESS;
> }
>
>
> Cheers,
>
> Matt
>
> > From: Jorge Guevara [mailto:jor...@gm...]
> > Sent: 16 June 2009 21:25
> > To: dev...@li...
> > Subject: [Dev-C++] chinese characters
>
> > I need to generate random characters for experiment with string matching
> algorithms , n=size of text
> > nombreArchivo=filename, when n is small the code below generate ascii
> characters, but when n is greater, (example n
> > =7000000), the code below generate chinesse characters, why?
>
> > sorry for my english :)
>
>
> > void crearArchivo(char* nombreArchivo, int n)
> > {
> > ofstream fSalida;
> > fSalida.open(nombreArchivo);
> > if(fSalida.is_open())
> > {
> > for(int i=0;i<n;i++)
> > {       char c=(char)rand();
> > fSalida<<c;
> > }
> > }
> > else
> > {
> > cout<<"el arhivo no se pudo crear";
> > }
>
> > fSalida.close();
> > }
>
>
> > int main()
> > {
> > crearArchivo("nuevo.txt",1000)  ;
> > system("PAUSE");
> > return EXIT_SUCCESS;
> > }
>
>
> > --
> > Jorge
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-- 
Jorge
http://jorge.sistemasyservidores.com
Escuela de Informática - Universidad Nacional de Trujillo