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you need:
myfile.getline(number,25); and atoi().

define another two semaphore:

sem_t zero, one;

a thread wait for zero and post one, while the other thread wait for one and post zero.

You need this gcc option:
-std=c99

1, Only memory allocated explicitly or implicitly by malloc() should be free() manually (explicitly or use wrapper of free).

2, If you don't free them, OS will recycle them when the process...

try the 'file' command

CC is the traditional UNIX C compiler, while GCC is GNU's compiler set incuding C compiler. On Linux the command cc may be a link to gcc.

‘$@' means all position parameters, which include noai.

No, I just read it now.

Hello, I find a trick to avoid pressing ESC without key-maping in vim. I am pleasure using this method, because ALT key is very comfortble for thumb to press.

What's the trick? the ALT key.
...

1 #!/bin/bash
2
3 if [ $# -ne 3 ];then
4 echo "Usage: $0 num1 num2 dir"
5 exit 1
6 fi
7 ls -1 $3 |sed -n "$1,$2p"
8 exit 0
9


...