[HP-UX 11.0]what is the difference between "int a[];" and "int *a

grace_limi

In a UNIX C process, I define the variable in the main.c program as:

int a[];

And define this variable in other programs as:

extern int *a;

I am able to go through variable a in main.c, but always fall into core dump while encountering this variable in any other program. Then I change the definition in other programs as:

extern int a[];

Then it works well. Who can tell the difference?

henrywen

a[]不用malloc分配内存！
*a需要！否则对空指针操作，当然core dump

grace_limi

yes, you two are right, and the important thing is that if using \"extern\", it should be the same format.