How can I pass array of pointers between my functions in C?

Question

I am biginner in C and PRO*C and need some help. I have a structure as below:

  typedef struct pt_st{
   char (*s_no)[100];
   char (*s)[100];
    } pt_st;

I have a function like c_info which calls post function:

int c_info(pt_st ir_st)
{
int   li_result = 0;
li_result = post(ir_st.s_no)
}

and post function is :

int post(char *is_st)
{
//do something
}

When I compile my program , I get three errors:

warning: passing arguments post from incompatible pointer type
warning: passing arguments post make integer from ponter without cast
warning: passing arguments post make ponter from integer without cast

Does anyone kow how can I fix this?

Thank you!

To declare a array of char do char arr[42]. Doing as you do (char (*parr)[42]) declares a pointer (parr) to an array of 42 chars. — alk
– alk, Commented May 25, 2015 at 10:57
Note: I retagged, cause I think the OP means the Oracle thing. — wildplasser
– wildplasser, Commented May 25, 2015 at 11:00

alk · Accepted Answer · 2015-05-25 14:28:15Z

2

pt_st.s_no as well a pt_st.s both declare a pointer to an array of char.

So the function post() needs to expect such, like:

int post(char (*s_no)[100]);

If the shown definition of int post(char * is_st) cannot be changed, then call it like this:

pt_st s = ... /* some initialisation */

int result = post(*(s.s_no));

edited May 25, 2015 at 14:28

answered May 25, 2015 at 10:50

alk

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10 Comments

Dax Over a year ago

Thanks for your reply, but still i get the same warning.

alk Over a year ago

@Dax: Which warning? Your question mentions 3 different warnings? And also for which of my both proposals?

Dax Over a year ago

I still get all these three warnings : warning: passing arguments post from incompatible pointer type warning: passing arguments post make integer from ponter without case warning: passing arguments post make ponter from integer without case for yur first proposal i.s. int post(char (*s_no)[NULL_BIG_SEQ_NO]);

alk Over a year ago

@Dax: Sry, but are you sure you are editing/compiling the right files? Also the error messages you quote are not 100% what any compiler would issue: "ponter"? "case"?

alk Over a year ago

Also check which lines the compilers tells you for where the warnings occur.

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