hidden

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#define DIM 10

int* int_bin(int x){
  int i;
  static int z[DIM];
  for(i=0; x != 1; i++){
    z[i] = x % 2;
    x /= 2;
  }
  z[8] = 0;
  return z;
}

int bin_int(int *x){
  int i, j = 0, z = 0;
  for(i=6; i>=0;i--){
    if(x[i]) z+=pow(2,j);
    j++;
  }
  return z;
}

int main(int argc, char **argv){
  FILE *fp, *f = fopen("out", "wt");
  char s[DIM];
  int i, j, k = 0, *p, z[DIM];

  if(!(fp=fopen("testo.txt", "rt"))){
    perror("Error");
    exit(-1);
  }

  for(i=0; z[k] != '\0'; i++){
    for(j=0, k=6; j<7; j++, k--){
      fscanf(fp, "%s", s);
      p = int_bin(atoi(s));
      z[k] = p[0];
    }
  k = bin_int(z);
  fprintf(f, "%c", k);
  }
}