title: Use curly braces({}) or equal sign(=) when initialize a variable
body: <p>When I am reading <a href="https://rads.stackoverflow.com/amzn/click/com/B00DUW4BMS" rel="noreferrer" rel="nofollow noreferrer">The C++ Programming Language 4th Edition</a>, to initialize a variable, the author said it's better to use <code>{}</code> than <code>=</code> to initialize a variable:</p>
  <p><a href="https://i.stack.imgur.com/aoQbA.png" rel="noreferrer"><img src="https://i.stack.imgur.com/aoQbA.png" alt="variable initialization" /></a></p>
  <p>But I see that there are more people use <code>=</code> than <code>{}</code>.<br />
  So which method is a good principle to persist? <code>=</code> or <code>{}</code>?</p>