When can I omit curly braces in C?

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The only places you can omit brackets are for the bodies of if-else, for, while, or do-while statements if the body consists of a single statement:

if (cond)
  do_something();

for (;;)
  do_something();

while(condition)
  do_something();

do 
  do_something();
while(condition);

However, note that each of the above examples counts as single statement according to the grammar; that means you can write something like

if (cond1)
  if (cond2)
    do_something();

This is perfectly legal; if (cond2) do_something(); reduces to a single statement. So, for that matter, does if (cond1) if (cond2) do_something();, so you could descend further into madness with something like

for (i=0; i < N; i++)
  if (cond1)
    if (cond2)
      while (cond3)
        for (j=0; j < M; j++)
          do_something();

Don’t do that.

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