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?

>>100,101
What you posted only shows that no lines are written to stdout, this doesn't exactly change anything, as the data is still written to stdout at program termination in the same manner as the C abstract machine would do it.