Copying one or more than one file into one file

Copying one or more than one file into one file

#include <stdio.h>

void main(int argc,char *argv[]){
     int i=0,
is_copied=0;

     FILE *input,
  *output;

     char ch;

     clrscr();


     if (argc>=3){

     /* last file is the output file */
     output=fopen(argv[argc-1],"w+");
     if (output==NULL){
gotoxy(10,1);
printf("Can't open output file :%s",argv[argc-1]);
getch();
return;
     }


     /* input files */
     for(i=1;i<argc-1;i++){
input=fopen(argv[i],"r");

if (input==NULL){
gotoxy(10,i+2);
printf("Can't open input file :%s",argv[i]);
}
else{
      /* writing from input file to output file */

       rewind(input);
       while((ch=fgetc(input))!=EOF){
      fprintf(output,"%c",ch);
      is_copied=1;
       }

       gotoxy(10,i+2);

       if (is_copied)
       printf("%s successfully copied into %s",argv[i],argv[argc-1]);
       else
       printf("%s can't copy into %s",argv[i],argv[argc-1]);

       is_copied=0;

}
                 fclose(input);
    }

    fclose(output);


      }
      else{
  gotoxy(10,1);
  printf("please specifiy at least two file one source and another target");
      }

      getch();
}

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