Last login: Tue Dec 19 09:16:09 2023 from 192.168.23.1
[root@localhost ~]# ls
anaconda-ks.cfg democ01.c democ02.c Documents Pictures Videos
a.out democ01.h democ02.h Downloads Public
a.txt democ01.o democo2.h Music temp
biaoc democ01pro Desktop original-ks.cfg Templates
[root@localhost ~]# democ01pro
bash: democ01pro: command not found...
[root@localhost ~]# vi democ03.c
[root@localhost ~]# gcc democ03.c
democ03.c: In function ‘main’:
democ03.c:6:11: error: ‘val’ undeclared (first use in this function)
int val3=val+6;
^
democ03.c:6:11: note: each undeclared identifier is reported only once for each function it appears in
[root@localhost ~]# vi democ03
[root@localhost ~]# vi democ03.c
[root@localhost ~]# gcc democ03.c
democ03.c: In function ‘main’:
democ03.c:7:11: error: ‘val’ undeclared (first use in this function)
int val3=val+6;
^
democ03.c:7:11: note: each undeclared identifier is reported only once for each function it appears in
[root@localhost ~]# vi democ03.c
[root@localhost ~]# vi democ03.c
[root@localhost ~]# gcc democ03.c
[root@localhost ~]# ls
anaconda-ks.cfg democ01.c democ02.c Desktop original-ks.cfg Templates
a.out democ01.h democ02.h Documents Pictures Videos
a.txt democ01.o democ03.c Downloads Public
biaoc democ01pro democo2.h Music temp
[root@localhost ~]# ./a.out
val1=20
val2=3
val3=6
[root@localhost ~]# vi democ.03
[root@localhost ~]# vi democ03.c
[root@localhost ~]# gcc democ03.c
[root@localhost ~]# ./a/out
-bash: ./a/out: No such file or directory
[root@localhost ~]# ls
anaconda-ks.cfg democ01.c democ02.c Desktop original-ks.cfg Templates
a.out democ01.h democ02.h Documents Pictures Videos
a.txt democ01.o democ03.c Downloads Public
biaoc democ01pro democo2.h Music temp
[root@localhost ~]# ./a.out
val1=20
val2=3
val3=6
赋值后：val1=3
val2=6
val3=3
[root@localhost ~]# vi democ04.c
[root@localhost ~]# gcc demov04.c
gcc: error: demov04.c: No such file or directory
gcc: fatal error: no input files
compilation terminated.
[root@localhost ~]# gcc democ04.c
democ04.c: In function ‘main’:
democ04.c:9:2: error: expected ‘;’ before ‘printf’
printf("\n");
^
democ04.c:11:2: error: expected ‘;’ before ‘return’
return 0;
^
[root@localhost ~]# vi democ04.c
[root@localhost ~]# gcc democ04.c
[root@localhost ~]# ./a.out
val1=0
