#include <stdio.h>
int main()
{
  int CODEN, COD;
  FILE *fp, *fp2;
  char c, opf[100], outpf[100];
  printf("Enter openfilename...\n");
  scanf("%s", opf);
  if ((fp = fopen(opf,"r")) == NULL){
    printf("NOT FOUND!\n");
    exit(1);
  }
  printf("Enter outputfile...\n");
  scanf("%s", outpf);
  printf("Enter CODENUMBER...\n");
  scanf("%d", &CODEN);
  fp2 = fopen(outpf,"w");
  printf("OPEN %s...\n", outpf);
  while ((COD = getc(fp)) != EOF){
    c = COD - CODEN;
    putc(c, fp2);
  }
  printf("FINISHED!\n");
  fclose(fp);
  printf("CLOSE %s...\n", opf);
  fclose(fp2);
  printf("CLOSE %s...\n", outpf);
  printf("COMPLETED!\n");
}