K&R C while loop omitting braces

From my understanding you need opening and closing braces for any 'standard construct in the language' (eg. a for loop/if statement etc. I don't know the real word for it) that contains multiple statements. So, why is this K&R C valid...

while((len = getline(line, MAXLINE)) > 0)
  if(len > max) {
    max = len;
    copy(longest, line);
  }

There's no braces on the while loop however, it does contain multiple statements (when the if is true). This is from example 1.9 in the 2nd edition of K&R's The C Programming Language.

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In your case, there's only one statement under your while loop which is the if condition. In that case, this code is correct.

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Because the if is read as a single statement body for the while . It's perfectly valid.

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