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Linux C ¿ª·¢»·¾³(debian)

#apt-get install gcc (±àÒëÆ÷)
#apt-get install gdb (µ÷ÊÔ)
#apt-get install libc6-dev (¿ª·¢¿â)
Èç¹ûûÓпª·¢¿â£¬gccµÄʱºò¾Í»á´íÎó
gcc h.c
h.c: In function ‘main’:
h.c:1: warning: incompatible implicit declaration of built-in function ‘printf                                             ’
/usr/bin/ld: crt1.o: No such file: No such file or directory
collect2: ld returned 1 exit status
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gcc h.c
h.c: In function ‘main’:
h.c:1: warning: incompatible implicit declaration of built-in function ‘printf
gcc -o hello hello.c
hello.c: In function ‘main’:
hello.c:2: warning: incompatible implicit declaration of built-in function ‘printf’
james@debian:~$ ls
a.out  h.c  hello  hello.c
james@debian:~$ ./hello
Hello Linux
james@debian:~$


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#include <stdio.h>
#include <stdlib.h> //use malloc, free
#include <string.h> //use memset
#include <ctype.h> //use isdigit
#define ERROR_ILLEGAL_CHAR 1 //define error illegal character as 1
#define ERROR_NUMBERS_DIF 2 //define error numbers is not the same in diffe ......
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