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Scathe
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 Posted: Wed Apr 01, 2009 1:53 pm Post subject: [C++] Creating Arrays of Structures |
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I'm a little confused as to how to pass arrays as parameters in functions.
Here's what i've got so far(This code compiles fine, i haven't set up arrays yet seeing as i can never get it to compile correctly.)
| Code: |
#include <iostream>
#include <sstream>
#include <string>
using namespace std;
struct student{
string name;
int age;
short ID;
};
string set_name();
int set_age();
short login();
int myInt;
int choice;
string myStr;
short myShort;
int main(){
student stud;
student* stu;
stu=&stud;
for(int x=0; x<25; x++){
cout<<"\nWould you like to create a new account, or login to an old one?"<<endl;
cout<<"\nCreate = 1, Login = 2"<<endl;
cin>>choice;
if(choice==1)
{
stu->name = set_name();
stu->age = set_age();
cout<<"\nPlease enter your desired ID# ";
cin>>stu->ID;
cout<<"\nYour user ID is: "<<stu->ID;
x++;
}
if(choice==2)
{
login();
if(login()==stu->ID){
cout<<"\nCongrats you have logged in";
cout<<"\nYour info is as follows: "<<endl;
cout<<"\nName: "<<stu->name<<endl;
cout<<"Age : "<<stu->age<<endl;
cout<<"ID : "<<stu->ID<<endl;
}
else
cout<<"\nIncorrect login ID";
}
}
system("PAUSE");
return 0;
}
int set_age(){
cout<<"\nPlease enter your age ";
cin>>myInt;
return(myInt);
}
short login(){
cout<<"\nPlease enter your ID# ";
cin>>myShort;
return(myShort);
}
string set_name(){
cout<<"\nPlease enter your name ";
cin>>myStr;
return(myStr);
}
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Any help as to how i would make an array of the structures, and be able to store multiple sets of data would be greatly appreciated.
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smartz993
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Posts: 2013
Location: USA
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| Posted: Wed Apr 01, 2009 2:41 pm Post subject: |
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I'm not reading your code.
Anyway,
When arrays are defined, they are basically pointers, and the number inside the brackets is the the allocation it will receive. (sizeof(type)*number)
If you want to pass an array, all you have to put in the parameters of the prototype is a reference to the array, and since arrays are already referenced (aka pointers) you can just do something like this:
| Code: |
void SetBuffer(int *buff, int iToSet)
{
for(int i = 0; i < 4; i++)
buff[i] = iToSet;
}
int _tmain(int argc, _TCHAR* argv[])
{
int buffer[4];
SetBuffer(buffer,6);
printf("[0]: %i\n[1]: %i\n[2]: %i\n[3]: %i",buffer[0],buffer[1],buffer[2],buffer[3]);
Sleep(10000);
return 0;
}
|
Something like that would work.
**EDIT:
Didn't see the other question..
You can make arrays a number of ways...
| Code: |
student *stu;
stu = (student*)malloc(15 * sizeof(student));
free(stu); //remember to free when done, or you will get memory leaks
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Noz3001
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| Posted: Wed Apr 01, 2009 3:22 pm Post subject: |
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| Code: | | student *fap = new student[15]; // 15 Students |
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Scathe
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| Posted: Wed Apr 01, 2009 8:15 pm Post subject: |
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Thanks guys 
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igoticecream
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| Posted: Wed Apr 01, 2009 10:40 pm Post subject: |
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when i read array of structures, do you mean lists on C?
if then, i have made this for school as a homework long time ago
| Code: |
#include <stdlib.h>
#include <stdio.h>
#include <windows.h>
#include <conio.h>
typedef struct nodo {
int numero;
char letra;
struct nodo *proximo;
}NODO;
NODO *primero = NULL;
int empty(nodo *primero){
if (primero == NULL)
return TRUE;
else
return FALSE;
}
nodo *insert(nodo *primero,int num,char let){
nodo *nuevo, *aux;
nuevo=(nodo*)malloc(sizeof(nodo));
nuevo->numero=num;
nuevo->letra=let;
if(primero == NULL){
nuevo->proximo=primero;
primero=nuevo;
}
else{
aux=primero;
while(aux->proximo != NULL)
aux=aux->proximo;
aux->proximo=nuevo;
nuevo->proximo=NULL;
}
return (primero);
}
... |
and in the main when it ask for number and letter
| Code: |
printf("Numero a agregar a lista: ");
scanf("%d",&numeroinput);
printf("Letra a agregar a lista: ");
scanf("%s",&letrainput);
primero=insert(primero, numeroinput, letrainput);
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this will create something liek this (where A represent a struct and where -> represent this points to)
A->A->A->A->A->NULL
[/quote]
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Scathe
I post too much
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Posts: 3631
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| Posted: Sun Apr 05, 2009 7:23 pm Post subject: |
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Thanks igoticecream that helped as well 
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Flyte
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| Posted: Sun Apr 05, 2009 7:45 pm Post subject: |
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| xwallflowerx wrote: | | Thanks igoticecream that helped as well |
If you are using C++, I would recommend you use the STL Containers. They are pretty efficient speed wise, just mind the bloat that can occur if you don't use them properly (as with everything template'd).
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