Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "In the second line, the coerce keyword forces the secret string to be a classical unsigned integer on four qubits."

A block of code is set as follows:

def scal[n:!ℕ](const x:uint[n], const y:uint[n])qfree:uint[n] { 
  count := 0:uint[n];
  for k in [0..n) { 
    count += x[k] && y[k];
  }
  return count;
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

def scal[n:!ℕ](const x:uint[n], const y:uint[n])qfree:uint[n] { 
  count := 0:uint[n];
  for k in [0..n) { 
    count += x[k] && y[k];
  }
  return count;
}

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "In the world of quantum computing we use the term qubit or quantum bit to represent the bits."

Tips or important notes

Appear like this.