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

The strtol function in the standard library takes a "base" parameter, which in this case would be 2.

int fromBinary(const char *s) {
  return (int) strtol(s, NULL, 2);
}

(first C code I've written in about 8 years :-)