Convert binary format string to int, in C

Question

How do I convert a binary string like \"010011101\" to an int, and how do I convert an int, like 5, to a string \"101\" in C?

Answer 1

For the 2nd part of the question, i.e. "how do I convert an int, like 5, to a string "101" in C?", try something like:

void
ltostr( unsigned long x, char * s, size_t n )
{
  assert( s );
  assert( n > 0 );

  memset( s, 0, n );
  int pos = n - 2;

  while( x && (pos >= 0) )
  {
    s[ pos-- ] = (x & 0x1) ? '1' : '0'; // Check LSb of x
    x >>= 1;
  }
}