In the introduction to K&R there is the following text:
Similarly, C offers only straightforward, single-thread control flow:
tests, loops, grouping, and subprograms, but not multiprogramming,
parallel operations, synchronization, or coroutines.
What does grouping refer to? It is not in the index, and searches have been unfruitful so far. I’ve programmed some C (though I’m far from an expert), and haven’t heard the term before.
4
“C program source text is free-format, using the semicolon as a statement terminator and curly braces for grouping blocks of statements.” (Wikipedia)
Blocks don’t look like control flow, but they are; without the curly braces only the next line would be controlled by a loop keyword, but with the braces the entire block is looped over.