In C, control flow like if, for, while, do, else, etc., take the rest of the line of code (i.e., till the next semi-colon) and runs it under the conditions of t

In C, control flow like if, for, while, do, else, etc., take the rest of the line of code (i.e., till the next semi-colon) and runs it under the conditions of the clause. braces—{}—allow you to take multiple lines of code and have them be guarded at the same time rather than having to repeat the condition. GP is taking advantage of the fact that the next for clause will be considered a single statement, and therefore the second set of braces are not technically needed. However, omitting braces for single-line snippets has caused plenty of havoc in the past (cf. Apple's gotofail). Some would say it is better to always include braces in control flow.