concatenare fisiere

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <io.h>
#include <fcntl.h>

int main(int argc, char* argv[])
{
        int i, ch;
        FILE *fi, *fo;
        for(i=1;i<argc;i++)
        {
                printf("\n\t%s\n",argv[i]);
                fi=fopen(argv[i],"r");
                if(!fi)
                {
                        fprintf(stderr,"Eroare la deschiderea fisierului in!");
                        exit(EXIT_FAILURE);
                }
                else
                {
                        fo = fopen("final.txt","a");
                        if(!fo)
                        {
                                fprintf(stderr,"Eroare la deschiderea fisierului out!");
                                exit(EXIT_FAILURE);
                        }
                        else
                        {
                                while(!feof(fi))
                                {
                                        ch = (char)fgetc(fi);
                                        if(!feof(fi))
                                                fputc((int)ch, fo);
                                }
                        }
                        fclose(fo);
                }
                fclose(fi);
        }
        return 0;
}
////concateneaza .c ;  .txt