Thread: Problem with Passing arguments/pointers..PLEASE HELP

Ive been trying to debug this peice of code for a couple days now, no matter what I try I continue to have the same problem..im trying to pass several arguments of different types from one function to a function..but It appears as if some how the parameters are being changed from one function to another, or they're not referencing properly the initial calling function is

Code:

bool draw_gemstones(struct PacmanBoard* pcmb_p){



	struct Gemstone *gemstn_p=(struct Gemstone*)malloc(sizeof(Gemstone));
	
	construct_gemstone(gemstn_p);
	
	init_gemstones(gemstn_p,pcmb_p,0.5,1,0);

	draw_Polygon(gemstn_p->gemstone);

	destruct_Polygon(gemstn_p->gemstone);


return true;
}

the problem is, when i look at x and y init_gemstone() (below) the values change from 1,0 to something like 12942342,12942342 (very large and x=y)

Code:

bool init_gemstones(struct Gemstone* gem_p,struct PacmanBoard* pcmb_p,double size,int x,int y){



	//get dimensions of individual cell
	double cell_w = pcmb_p->width / (double)(pcmb_p->ncells_x);
	double cell_h = pcmb_p->height / (double)(pcmb_p->ncells_y);

	struct Point* points = (struct Point*)malloc(4*sizeof(Point));

	//find center position of cell
	gem_p->position->x=-1+(x*cell_w)+(cell_w/2); //BREAK POINT
	gem_p->position->y=1-(y*cell_h)+(cell_h/2);

	points[0].x=gem_p->position->x-cell_w*(size/2);
	points[0].y=gem_p->position->y;					
	
	points[1].x=gem_p->position->x;
	points[1].y=gem_p->position->y+cell_h*(size/2);

	points[2].x=points[0].x+size*cell_w;
	points[2].y=points[0].y;

	points[3].x=points[1].x;
	points[3].y=points[1].y-size*cell_h;


	init_Polygon(gem_p->gemstone, gem_p->position, 4, points, 1.0, 1.0, 1.0);



return true;
}

when i have been trying to debug i place a break point at the line
gem_p->position->x=-1..., i tried to place a break point at the line below it, but it says the break point will never be hit?

PLEASE HELP..I normally would ask people to help debug my work, but im desperate, ive been staring at this for days now with out accomplishing anything...

heres one of my header files with the stuct for gem_p

Code:

#ifndef _UOW_GEMSTONE_H
#define _UOW_GEMSTONE_H

#include "uow_graphics.h"
#include "drawing.h"
#include "board.h"
#include <cmath>

struct Point{
   int x;
   int y;

}


struct Gemstone {

	struct Point *position;
	struct Polygon *gemstone;
	//with respect to the size of a cell
	double size;
	//score value
	int value;


};
bool draw_gemstones(struct PacmanBoard* pcmb_p);
bool init_gemstones(struct Gemstone *gem_p,struct PacmanBoard* pcmb_p,double size,int x,int y);
bool construct_gemstone(struct Gemstone *gem_p);

#endif

the main problem is; im basically trying to plot something on a grid (draw a picture at a certain location in a window)...im passing my x and y values (1 and 0,which corrispond to coordinates on the grid) to state where i would like plot this object, the x and y values are used in a calculation(convert from location in matrix,to location in cartesian plane) to get me exact coordinates. ideally give x=1 and x=0 i should end up with something like x=-0.87 and y=0.93 ..but instead, the x and y are somehow not being passed as 1 and 0, they are being passed as 2 very large equal numbers, and there for my location on the plane is incorrect...there really isnt any need for print f statements,because my debugger gives the values of each items at each point in the program..and i stick cant find the problem

ya the struct for point was in a different header file, so when i did my reply i just through that in
..and when you say print them first, do you mean before the call to init_gemston()?

i appologize if im confusing you guys, the code segments are just small segments of a very large project that consists of several files...the details of the actual program, im not sure are important...ill try to break down what my problem is again with a much more simple example

this is what i want to happen:

Code:

function1(){

     function2(1,0);    //call function2 with hardcoded parameters

}
function2(int x,int y){

   perform actions on:1
   perform actions on:0
}

whats happening is:

Code:

function1(){

     function2(1,0);    //call function2 with hardcoded parameters

}
function2(int x,int y){

   perform actions on:2938474
   perform actions on:2938474
}

the only issue with that, is this is all graphics and drawings of simple polygons, print statments actually dont work, so i use a debugger with a breakpoint in that location to read the values of x and y at that time...and at that point in the code they are large equal numbers...that i dont like

ok, so i figured out how to incorporate a printf into my code, and its giving me the same thing as the debugger

can anyone offer any other solution?..PLEASE! im desperate, its been a week now, and i still havent resolved this problem

yes I tried quzahs suggestion and nothing changed..i think i narrowed it down to a problem with defrefercing a struct pointer to struct pointer...
im trying to fill the value of gem_p->position->x and gem_p->position->y when i debug it tells me theres an error referencing those value