Program won't crash when it should

(GCC C)
I ran a pointer over each member of an integer array, storing one character of input in each cell.

The program seems to consistently crash when I try to store X+3 or more characters, where X is the size of the array, but if I do not exceed X+2 it will not crash.

Why does it crashes exactly at the point it does, but not for X+1 or X+2?

>>47
I never said nor implied that casting printf() to void produced undefined behavior. By the way, that isn't the semenatic error. Try again toilet scrubber.

>>51
The programming doesn't flush its stdout.