Semicolon at the ends of if-statements and functions in C

Question

I just ran into some code that overuse semicolons, or use semicolon for different purposes that I am not aware of.

I found semicolons at the end of if-statements and

Answer 1

that's dummy statememt. You sample is identical to

if (x == NULL) {
 // some code
 do_something_here();
}

/* empty (dummy statement) here */ ;

// more code
some_other_code_here();