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

void ver_binario(unsigned int buff, int n) {
   unsigned int enbinario;
   int inicio=pow(2,n-1);

   for(enbinario=inicio; enbinario>0; enbinario>>=1) {
      if (enbinario&buff)
         printf("1");
      else printf("0");}
    printf("\n");
}

int bin(unsigned char buffer, int nb) {
   int i, mostrar;

   for(i=0; i<nb; i++, buffer>>=1) {}
   ver_binario(buffer,1);
}

unsigned char rotar(unsigned char buffer, int nb) {
    buffer=(buffer<<nb)|(buffer>>(8-nb));
}

unsigned char set_bit(unsigned char buffer, int nb, int val) {
   int i;

   return (buffer &(~(1<<nb)))|(val<<nb);
 }