This does work
LLIST *mylist[10] = {NULL};
But would if I wanted to do this I get errors:
int x=10;
LLIST *mylist[x] = {NULL};
x can be any value I'm setting it to 10 for the time being. x is going to be used as a counter.
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44answers:
1
+3
A:
Support for variable length arrays (which your second example uses) came in the C99 standard, which your compiler may not support.
For gcc, you should pass the -std=c99 option when compiling.
Kyle Lutz
2010-01-22 22:39:23
I use a make file that i run to compile
MRP
2010-01-22 22:45:53
In that case you should modify the `CFLAGS` and add `-std=c99`.
Kyle Lutz
2010-01-22 22:47:22
@MRP: Then set the CFLAGS environment variable to include `-std=c99`
rampion
2010-01-22 22:48:05
I'm new using c and compiling
MRP
2010-01-22 22:48:44
ok i will try that
MRP
2010-01-22 22:49:21
here is my make fileCC=gccCFLAGS=-Wall -g#LIBS=-lreadline -lmOBJS=llist.o myprogram.oINCLUDES=llist.hall: $(OBJS) $(CC) $(CFLAGS) $(OBJS) $(LIBS) -o myprogram.c.o: $*.h $(INCLUDES) $(CC) $(CFLAGS) -c $*.cclean: rm -f *.o myprogram
MRP
2010-01-22 22:51:18
i wish there was a better way to post it
MRP
2010-01-22 22:51:48
Would i just add then CFLAGS=-Wall -g -std=c99
MRP
2010-01-22 22:53:05
Yupp, it works right? Or do you still get the same compiler errors?
emil
2010-01-22 22:58:04
yeah I get the same error
MRP
2010-01-22 22:59:42
error: variable-sized object may not be initialized
MRP
2010-01-22 23:00:41
and that means, the compiler don't know how long it should initialize your array at _compile time_, then you will need to do#include <strings.h>...bzero(mylist, sizeof(LLIST *)*x);
emil
2010-01-22 23:05:59
i have #include <strings.n> i never heard of the bzero function.. My original thought when starting this program it would be easier doing a link list of link lists.. defining an array size of an arbitrary number makes no sense.
MRP
2010-01-22 23:11:56
Is this then the correct way to implement it:LLIST *mylist[] = {NULL};bzero(mylist, sizeof(LLIST *)*x);
MRP
2010-01-22 23:15:55
it does compile soo thats good news I just dont know if it works the same
MRP
2010-01-22 23:16:43
LLIST *mylist[] = {NULL}; is the same as writing LLIST *mylist[1] = {NULL};you should change LLIST *mylist[] = {NULL}; to LLIST *mylist[x]; and then do your bzero. otherwise you will have to allocate the array yourself with ex. malloc(3)
emil
2010-01-22 23:23:08
so I have... int x; LLIST *mylist[x]; x=10; then bzero(mylist, sizeof(LLIST *)*x);
MRP
2010-01-22 23:30:23
im still not getting it to work.
MRP
2010-01-22 23:34:37
int x = 10; LLIST *mylist[x]; then bzero(mylist, sizeof(LLIST *)*x);Otherwise the x will have a random value when it is to decide the size of the mylist array.
emil
2010-01-23 00:47:45