Project Four Solution

/* MCS 260 Project 4 : converting characters into bit sequences */

#include<stdio.h>

int read_byte ( void );
/* reads 8 bits from standard output and returns the value,
   returns -1 if '>' or EOF is reached */

void print_byte ( int n );
/* writes the binary representation of a number between 0 and 255 */

int main ( void )
{
   int n, c = getchar();

   if (c == '<')
   {
      printf("\"");
      while ((n = read_byte())!= -1) printf("%c",n);
      printf("\"");
   }
   else
   {
      printf("<"); 
      while ((c = getchar())!= '"') print_byte(c);
      printf(">");
   }

   return 0;
}

int read_byte ( void )
{
   int bit,i,n = 0;

   for (i = 0; i < 8; i++)
   {
      bit = getchar();
      if ((bit == '>')||(bit == EOF)) return -1;
      n = 2*n + (bit - '0');
   }

   return n;
}

void print_byte ( int n )
{
   int i,val = 128;
   int nb = n;

   for (i = 8; i > 0; i--,val /= 2)
   {
      if (nb < val)
 	 putchar('0');
      else
      {
         putchar('1');
         nb -= val;
      }
   }
}