array of structures
Hi,
I need to pass an array of structures to a function, fill in the values in the structure(which will be read from a file). Depending on the number of structures filled i have to return that number and the array. I am not getting how to pass the array and return the array and the number of structures filled.
tish.
just like any other arrayOriginally Posted by tish
Code:struct test { int x; } #define MAX_STRC 10 int main(void) { strcut test arr[MAX_STRC] = {0}; int size = fillArr(arr,MAX_STRC); return 0; } int fillArr(struct test* pArr, int maxSize) { pArr[0].x = 1; pArr[1].x = 200; return 2; }
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler
is it mandatory to supply the max size of the array?
The logic i have applied is:
In a while loop i read a string from a file, and parse it, extract some fields and assign them to the structure as:
strcpy(pArr[i].name,tish);
when a ',' is encountered i increment 'i' and jump back to while.
No, but if you don't supply an initial size to the array, then you'll have to malloc the size, at a later time. Which is not a big deal.
Somehow, someway, you need to come up with an initial size for the array. It can be increased in size later, if you like (using realloc() ).
Last edited by Adak; 04-05-2009 at 02:24 AM.
ohkai..
somehow when i am filling in the structures in the array, i am able to print only the last structure's entries...
What could be the reason for that?
Show the codeohkai..
somehow when i am filling in the structures in the array, i am able to print only the last structure's entries...
What could be the reason for that?
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler
i guess i had not incremented the pArr. It working now...
Thanks a lot for the help...
i have another question:
I need to pass another arguement to the function which would be an output parameter. The parameter would return the number of enteries of the array that have been filled.
How can pass an output parameter as a function arguement?
pass a pointer to the variable you want to modify
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler
You can return the value:
If you stop incrementing i when it still has a valid data item (like i equals the very last subscript of the array), then return i. Otherwise, return i - 1;Code:MaxNumber = myFunction(array //whatever else); int myFunction (//your parameters here) { int i = 0; //your code that loads the array and counts the array items, here return i - 1; }
