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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