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That's a variable declaration without a variable name; normally (only?) used in function signatures where you have to accept that type of argument, but don't actually want to use the variable. With...

Short version:

Integral promotion with sign extension followed by left truncation.


Long version:

Whether char is signed or unsigned depends on the implementation. Working backwards, 0xFF00...

This is a program from K&R.

after executing you should type couple of lines as input, and then hit ctrl+D.

Then this will output number of lines you have entered.

Strange, Ctrl+D should have worked. With Ctrl+Z, you've sent the program into the background, suspending its execution, so there won't be any more output (check the output of ps -ef, and you'll see...

I think in Unix ctrl + d will work