Multiple return values form functions using Pointers

[Nish]

Hi all,
I need to ask this: I need to modify the value of some variables by calling another function.This has to do with elements of a linked list.

for example:

funct1()
{
  int a,b,c;
  struct yz *ptr;
  ptr=A[0];
  a=some expression;
  b= some expression;
  c=some expression;
  ptr=some modification;

  funct2(*ptr)
  a=some new expression;
  b= somenew expression;
}

The funct2 should take a value of the pointer which will be modified in my funct1. Now using this I need to change the values of a,b,c so that when I return back to funct1 I have new values which I then can use to evaluate my "some new expression" . Basically I want my functionto return multiple values. I cannot undestand how to use pointers for this.
Some halp would be appreciated.

[bithub]

The following code uses pointers to change the values of integers passed to a function.

#include <stdio.h>

void foo(int *i, int *j, int *k) 
{
   *i = 1;
   *j = 2;
   *k = 3;
}

int main(void)
{
   int a,b,c;
   foo(&a, &b, &c); /* pass the addresses of the integers */
   printf("a = %d, b = %d, c = %d\n",a,b,c);
   return 0;
}

[Nish]

Hi Thanks for that but the problem is when I use this function I get a result which is different if I implement it without the function.
I need to pass a pointer to a linked list too so my function would declaration would be:

void func(struct yz *ptr, int *i, int *j, int *k);

in my main i would call the function as

func(newptr, &a, &b, &c);
where newptr is defined before the function call..

I suppose there is some problem withthe way I am passing the pointer.

Could you suggest where I might be going wrong.

[prog-bman]

Post the code and the errors that always helps .

[Nish]

The part for which I need my function is indicated by start and end

for (k=0;k<40;k++)
    {
      xtemp = Y->Array[k];
     //start
      Nline = xtemp->line_used;
      Npin = xtemp->pin_no;
      xtemp = xtemp->nextptr;

      Wline = xtemp->line_used;
      Wpin = xtemp->pin_no;
      xtemp = xtemp->nextptr;

      Sline = xtemp->line_used;
      Spin = xtemp->pin_no;
      xtemp = xtemp->nextptr;
      
      Eline = xtemp->line_used;
      Epin = xtemp->pin_no;
      //end
    }

So everytime I have a pointer of the same type which changes and hence I pass the pointer along with address of Nline, Npin etc.

My function looks like this:

void get_line_pin(SWITCH *xtemp, int *t1, int *t2, int *t3, int *t4, int *t5, int *t6, int *t7, int *t8 )
{



      *t1 = (xtemp->line_used);
      *t2 = (xtemp->pin_no);
      xtemp = xtemp->nextptr;

      *t3 = (xtemp->line_used);
      *t4 = (xtemp->pin_no);
      xtemp = xtemp->nextptr;

      *t5 = (xtemp->line_used);
      *t6 = (xtemp->pin_no);
      xtemp = xtemp->nextptr;
      
      *t7 = (xtemp->line_used);
      *t8 = (xtemp->pin_no);
}

and my function call is

get_line_pin(newptr, &Nline, &Npin..... uptil &Epin);