Write binary

 
#include <ostream>
 
/// Write an unsigned integral in binary base on an output stream.
/// @param stream The stream to write to.
/// @param value The unsigned integral value to write.
/// @param digits The number of digits to write.
/// @return The stream that was written to.
/// @author Peter Jansson   http://peter.jansson.net
/// @date 2008-11-05.
/// @licence Dedicated to the public domain.
template<typename T> std::ostream& WriteBinary(
      std::ostream& stream,
      const T& value,
      const unsigned char& digits)
{
   for( T bit( 1 << (digits-1) ); bit > 0 ; bit >>= 1 )
   {
      stream << (( value & bit )?'1':'0');
   }
   return stream;
}
 

Or, if you have too little resources available:

 
/// Write an unsigned integral in binary base on a character buffer.
/// @param value The unsigned integral value to write.
/// @param digits The number of digits to write.
/// @param buffer The buffer to write to. Must be at least as long
///               as the number of digits to write.
/// @author Peter Jansson   http://peter.jansson.net
/// @date 2008-11-07.
/// @licence Dedicated to the public domain.
template<typename T> void WriteBinary(
    const T& value,
    const unsigned char& digits,
    char* buffer)
{
  for( T bit( 1 << (digits-1) ); bit > 0 ; bit >>= 1, buffer++ )
  {
    buffer[0] = (( value & bit )?'1':'0');
  }
}
 

 

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