DaniWeb Forum Index > Software Development > C++

C Program solution needed...

Please support our C++ advertiser: Intel Parallel Studio Home

•

Join Date: Oct 2006

Posts: 2

Reputation: vijay.neo is an unknown quantity at this point

Solved Threads: 0

vijay.neo

Offline

Newbie Poster

C Program solution needed...

Oct 18th, 2006

Hi friends,

As i a writting small C program to pass the structure pointer in the function. i am endup with small problem, plz let me know how to crack this one?
/////////////////

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
void function1(void *);
void main()
{
 int size_offset = 0;
 typedef struct 
 {
  int a;
  int b;
  int c;
  char ch;
 }A;
 A *pst = NULL;
 pst = (A*)malloc(sizeof(A)*1);
 function1((void*)pst);
}
void function1(void *pStr)
{
   // As i need to intialize the structure members. i want to access it's me
mbers.
   // How can i know the structure's 
   // memory layout in this function? 
   //Conditions:
   //1. i do not want to declare the structure as global or static.
   //2. I will pass the structure pointer as void pointer.
}
void function1(void *);
void main()
{
 int size_offset = 0;
 typedef struct 
 {
  int a;
  int b;
  int c;
  char ch;
 }A;
 A *pst = NULL;
 pst = (A*)malloc(sizeof(A)*1);
 function1((void*)pst);
}
void function1(void *pStr)
{
   // As i need to intialize the structure members. i want to access it's me
mbers.
   // How can i know the structure's 
   // memory layout in this function? 
   //Conditions:
   //1. i do not want to declare the structure as global or static.
   //2. I will pass the structure pointer as void pointer.
}

•

Join Date: Dec 2005

Posts: 5,850

Reputation: Salem has a reputation beyond repute

Solved Threads: 751

Salem

Offline

Void main'ers are DOOMed

Re: C Program solution needed...

Oct 18th, 2006

Given your restrictions on what you can do, nothing can be done to fix your code.

•

Join Date: Jun 2005

Posts: 275

Reputation: andor has a spectacular aura about

Solved Threads: 29

andor

Offline

Posting Whiz in Training

Re: C Program solution needed...

Oct 18th, 2006

Your type A, can it be outside of the main function? Still your pst struct is local beside that.
NOTE: Instead of void main use int main.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
void function1(void *pStr)
{
   A * ptmp = (A *) pStr;
 
   ptmp->a = 0;
   ptmp->b = 0;
   ptmp->c = 0;
   ptmp->ch = '\0';
}
void function1(void *pStr)
{
   A * ptmp = (A *) pStr;
   
   ptmp->a = 0;
   ptmp->b = 0;
   ptmp->c = 0;
   ptmp->ch = '\0';
}

if type A is in front of int main.

If you want to win, you must not loose (Alan Ford)

•

Join Date: Aug 2005

Posts: 15,616

Reputation: Ancient Dragon has a reputation beyond repute

Solved Threads: 1491

Ancient Dragon Ancient Dragon is online now

Online

Still Learning

Re: C Program solution needed...

Oct 18th, 2006

>>pst = (A*)malloc(sizeof(A)*1);

1. The "*1" is unnecessary and spurious.
2. C programs do not require typecasting. So remove that typecast. If your compiler complains then your are apparently writing a c++ program.

3. Move that structure above the functuion main() so that it is visible to all other functions. Then change function1 parameter to use that structure instead of passing a void pointer. You will need to change the function prototype at the top of your program too.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
void function1(A *pStr)
{
  // blabla
}
void function1(A *pStr)
{
  // blabla
}

4. Come up with a better naming convention than "A". That is a sure sign of poor programming habits. You are new at this, so learn the right way at the very start.

Last edited by Ancient Dragon; Oct 18th, 2006 at 10:30 am.

•

Join Date: Mar 2009

Posts: 1

Reputation: 18jainabhishek is an unknown quantity at this point

Solved Threads: 0

18jainabhishek 18jainabhishek is offline

Offline

Newbie Poster

Re: C Program solution needed...

Mar 31st, 2009

plz solve this problem

Consider the ADT set that represents a collection of integers. The ADT should support standard set operations:

S = init();
/* Initialize S to the empty set */

isEmpty(S);
/* Return true if and only if S is the empty set */

isSingleton(S);
/* Return true if and only if S contains only one element */

isMember(S,a);
/* Return true if and only if a is a member of the set S */

S = addElement(S,a);
/* Add the element a to the set S. If a is already in S,
there will be no change, else a new element is to be inserted. */

S = delElement(S,a);
/* Remove the element a from the set S. No change if a is not
a member of S. */

S = union(U,V);
/* Assign to S the union of the sets U and V */

S = intersection(U,V);
/* Assign to S the intersection of the sets U and V */

S = difference(U,V);
/* Assign to S the set difference U - V */

S = symmDiff(U,V);
/* Assign to S the symmetric difference (U - V) union (V - U) */

printElements(S);
/* Print the elements of the set S */

Implement the set ADT using dynamic arrays. You will need to use realloc to change the size of an array that was dynamically allocated earlier.

•

Join Date: Aug 2007

Posts: 1,679

Reputation: vmanes is a splendid one to behold

Solved Threads: 193

vmanes

Offline

Posting Virtuoso

Re: C Program solution needed...

Mar 31st, 2009

•

Originally Posted by 18jainabhishek

plz solve this problem

A - no one is likely to solve your problem for you. You must attempt the solution, show your work, and we'll help you get to the solution you need.

B - don't ask a question by replying to an unrelated thread - that's hijacking and not appreciated

B+ - really don't do this with a thread that's over 2 years old!

Please read the sticky posts at the top of this forum to learn the rules that will make your visit here more pleasant and productive.

Everyone's gotta believe in something. I believe I'll have another drink.
~~~~~~~~~~~~~~~~~~
Looking for an exciting graduate degree? Robotics and Intelligent Autonomous Systems (RIAS) at SDSM&T See the program brochure here.