Thread: Strange structure array issue...

hi!

i created two structure arrays in my program, one is working well, but the other one is being stupid :-(

here's what's happening, i created 2 structure arrays:

Code:

	Paciente listaPaciente[250];
	Medico listaMedico[10];

at first i only had Medico listaMedico[10]; in my program and everything worked :-)
but since i created Paciente listaPaciente[250]; every time i try and run the program it crashes :-(

but the weird thing is, when i change the listaPaciente[]; array size to, for example, listaPaciente[100]; the program runs nicely :-S

Can any one tell me why is this happening?

how come?
i just created a array for 250 elements, and that array is empty. the program crashes when i run it

What is the type Paciente? I'm guessing it's a struct of some sort, and as such, it can take quite a few bytes per entry.

What compiler/environment are you running this in? Depending the environment, the stack may be quite small, and in that case, 250 structs of a few hundred bytes can easily blow the stack up. With no stack the application WILL crash in the most dramatic ways.

--
Mats

hi...

yap it's a struct:

Code:

typedef struct
{
	int dia, mes, ano;
}Data;

typedef struct
{
	char tipoConsulta[10];
	Data dataConsulta;
	int medico;
	char especial[100];
	char desc[300];
}Consulta;

typedef struct paciente
{
	char nome[200];
	char morada[300];
	int contacto;

	int numBenif;
	char medicoFamilia[200];

	Consulta historico[10];
}Paciente;

i'm using VS2008, and in my project i have to use a struct array with 250 elements :-(

you paciente has about 818 bytes of the size
so 250 structs will take ~ 204K of memory
your consulta is also big enough...

better use dynamic allocations for these arrays...

dame!

this is a 2part school project, the 1part has to bee done with standard arrays, and in the 2part of the project we must use dynamic arrays :-(

is there anything i can do to reduce the memory size?

as a last option - you can make them global...

AS a intermediate solution - I would replace all char arrays in your structs to pointers and allocate strings as you know the length

i changed the char arrays in the struct struct to pointers:

Code:

typedef struct
{
	char *tipoConsulta;
	Data dataConsulta;
	int medico;
	char *especial;
	char *desc;
}Consulta;

and know it works :-)
i'm not sure that i can't use global variables in my project, so what are consequences in using pointers?

so what are consequences in using pointers?

You will have a lot more work managing your memory allocations...