#include <stdio.h>
main()
{
FILE *fin *fout;
char c, x;
    if (((fin=fopen("DATOSIN.txt","rt"))==NULL ||
    ((fout=fopen("DATOSOUT.txt", "wt"))==NULL))
    {if if (fout ! = NULL) fclose (fout) ;
    if (fin ! = NULL) fclose (fin) ;
    printf ("Error en la apertura de ficheros de salida \n" );
    return 1;
    }
    c = fgetc(fin);
    while (c != EOF)
    { x = fputc (c, fout);
    if (x! = c) printf ("Error de escritura");
    c = fgetc(fin);
    }
    fclose (fin);
    fclose (fout);
    return 0;
}