About gcc in Mandrake 9.0!!!

mantou

The linux i used now is the Mandrake 9.0!
i use the linux to practise the C pro.

i found th GCC version is 3.2,and the version i used in Red Hat 7.2 is older.

And i found ,the program i maked as the book,i can make it to program sucessfully in Red Hat 7.2,but have some problem in Mandrake 9.0 .

i am confused,and i can't solved it .


i hope the gaoshou can tell me the difference between them!

it's so serious!

i am auxious!     Thank you!

kj501

把编译时的错误贴出来让大家扶看看.

mantou

好的！

mantou

[smallmantou@Smallmantou linuxC]$ gcc sort.c
sort.c:2:1: warning: "NULL" redefined
In file included from /usr/include/_G_config.h:14,
                 from /usr/include/libio.h:32,
                 from /usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2/include/stdio.h:74,
                 from sort.c:1:
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2/include/stddef.h:369:1: warning: this is the location of the previous definition
sort.c: In function `creat':
sort.c:36: parse error before '!' token
sort.c: At top level:
sort.c:44: parse error before '->' token
sort.c: In function `insert':
sort.c:51: `pa2' undeclared (first use in this function)
sort.c:51: (Each undeclared identifier is reported only once
sort.c:51: for each function it appears in.)
sort.c:54: parse error before '!' token
sort.c:68: parse error before '!' token
sort.c:68: parse error before '!' token
sort.c: In function `print':
sort.c:80: parse error before '!' token
sort.c: At top level:
sort.c:85: parse error before "while"

mantou

[smallmantou@Smallmantou linuxC]$ cat sort.c
#include <stdio.h>
#define NULL 0
#define LEN sizeof(struct student)
struct student
{ long num;
  int score;
  struct student * next;
};
struct student listA,listB;
int n,sum=0;

main()
{struct student * creat(void);
struct student * insert(struct student *,struct student *);
void print(struct student *);
struct student * ahead,* bhead,* abh;
printf("\nInput list a:\n");
ahead=creat();
sum=sum+n;
printf("\nInput list b:\n");
bhead=creat();
sum=sum+n;
abh=insert(ahead,bhead);
print(abh);
}


struct student * creat(void)
{struct student * p1,* p2,* head;
n=0;
p1=p2=(struct student * )malloc(LEN);
printf("Input number & scores of student:\n");
printf("If number is 0,stop inputing.\n");
scanf("%ld,%d",&p1->num,&p1->score);
head=NULL;
while(p1->num! =0)
     {n=n+1;
      if(n==1)head=p1;
      else p2->next=p1;
      p2=p1;
      p1=(struct student * )malloc(LEN);
      scanf("%ld,%d",&p1->num,&p1->score);
     }
p2->next=NULL;
return(head);
}


struct student * insert(struct student * ah,struct student * bh)
{struct student * pa1,* p2,* pb1,* pb2;
pa2=pa1=ah;
pb2=pb1=bh;
do
   {while((pb1->num>pa1->num) && (pa1->next! =NULL))
       {pa2=pa1;
        pa1=pa1->next;
       }
    if(pb1->num<=pa1->num)
       {if(ah==pa1)
        ah=pb1;
        else pa2->next=pb1;
        pb1=pb1->next;
        pb2->next=pa1;
        pa2=pb2;
        pb2=pb1;
       }
   }
while((pa1->next! =NULL)||(pa1==NULL && pb1! =NULL));
    if((pb1->num>pa1->num) && (pa1->next==NULL))
        pa1->next=pb1;
return(ah);
}



void print(struct student * head)
{struct student * p;
printf("\nThese are %d records:\n",sum);
p=head;
if(p! =NULL)
   do
     {printf("%ld %d\n",p->num,p->score);
      p=p->next;
     }
   while(p! =NULL);
}

mantou

[smallmantou@Smallmantou linuxC]$ gcc -v
Reading specs from /usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2/specs
Configured with: ../configure --prefix=/usr --libdir=/usr/lib --with-slibdir=/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --enable-long-long --enable-__cxa_atexit --enable-languages=c,c++,ada,f77,objc,java --host=i586-mandrake-linux-gnu --with-system-zlib
Thread model: posix
gcc version 3.2 (Mandrake Linux 9.0 3.2-1mdk)

高原之狼

> #define NULL 0

Delete this line. Or, if you really want, code like this:

#ifndef NULL
#define NULL 0
#endif  /* NULL */

> main()

Please use
int main()

> while(p1->num! =0)

!= is an operator, can not be separated. Use

while(p1->num != 0)

Please change these and compile again.

mantou

能用中文说明一下，这个版本的gcc和原来的有什么不同吗？

版本升级了，是不是有些要注意了？

#define NULL 0
#endif /* NULL */

int main()

能解释一下为什么吗？这个可是书上的原程序呀！ 应该没有错的呀
我在gcc 2.9的版本中怎么没有这么多的问题？？

还希望高手帮忙，救我救到低，小弟不胜感激！！

mantou

It's can run now!  Thank you!
but  there some information come up!   there is smoe warning,and explain the LIB adn .H  directory where is!
is there some affect??



[smallmantou@Smallmantou linuxC]$ gcc sort.c
sort.c:3:1: warning: "NULL" redefined
In file included from /usr/include/_G_config.h:14,
                 from /usr/include/libio.h:32,
                 from /usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2/include/stdio.h:74,
                 from sort.c:1:
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2/include/stddef.h:369:1: warning: this is the location of the previous definition

mantou

/usr/include/_G_config.h:14,
/usr/include/libio.h:32
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2/include/stdio.h:74,
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2/include/stddef.h:369:1: warning: this is the location of the previous definition


this i have seen,and i think is the answer for the difference about the different version of th GCC in   
Mandrake LInux,

because i am the fresh man for the C pro.  so in this
GCC pro making system ,and in the so new version ,i am coufused ,
  i hope the 高原之狼 daxia,can be patient for explaining about the point what i should be attentioned in the GCC 3.2!!!

thank you!