Thanks, This is a workable solution.
But the issue is I've some 100+ structures. So, writing
a if or case is going to be difficult.
a) You are right.
b) Yes. I want to pass a structure name. ie, make sizeof
accept a variable.
Is this impossible?
Thanks,
Vikas
--- Steve Graegert <[EMAIL PROTECTED]> wrote:
> On 7/15/05, Vikas S <[EMAIL PROTECTED]> wrote:
> >
> > I guess I was not clear. Say, we have two structures.
> >
> > str1 {int x, char y} and str2 {int x, char *y};
>
> OK...
>
> > printf(sizeof(struct str1)); will give proper output. ie memory occupied
> > by str1.
>
> ...reasonable...
>
> > What I want is, instead of hard-coding str1 etc., I want to find
> > the size of structure which I will give as 1st argument. So, if the
> > program name is size, i'll give:
> > $ ./size str1 --- to get size of str1
> > $ ./size str2 --- to get size of str2
>
> This makes things even more confusing to me. So, you want
>
> (a) query the size of a particular structure among others
> (b) provide a structure as an argument to your program
>
> identified by name? Obviously (b) is something completely impossible,
> obscure at least. The solution to (a) is simple:
>
> struct s1 { int i; char *c; } str1;
> struct s2 { int i; char c[5]; } str2;
>
> if (argc != 2) return 0;
>
> if (!strcmp(argv[1], "str1"))
> printf("sizeof(str1): %d\n", sizeof(str1));
> else
> printf("sizeof(str2): %d\n", sizeof(str2))
>
> $ cc -o test test.c
>
> $ ./test str2
> sizeof(str2): 12
>
>
> > The code which I gave earlier is giving compile-time error message.
> >
> > Thanks,
> > Vikas
> > --- Rechberger Markus <[EMAIL PROTECTED]> wrote:
> >
> > > strlen on a null pointer will segfault...
> > > if arc is 1 then argv[0] will contain a pointer to an array of char
> > > if arc is 2 then argv[1] (the users first argument) will contain an
> > > array of char..
> > > so don't forget to check the number of arguments ..
> > >
> > > On 7/15/05, Vadiraj <[EMAIL PROTECTED]> wrote:
> > > > Vikas,
> > > >
> > > > On 7/15/05, Vikas S <[EMAIL PROTECTED]> wrote:
> > > > > I want to find out the size of a structure which the user will give
> > > > > as an argument
> > > > > as follows.
> > > > >
> > > > > #include <> -- All includes..
> > > > > ..
> > > > > main(int arc, char *argv[])
> > > >
> > > > argv is a charecter pointer . You cannot pass struct * as an
> > > > arguement to main.
> > > >
> > > > > {
> > > > > printf("Size of structure %s is: %d\n", argv[1], sizeof(struct
> > > > > argv[1]));
> > > >
> > > > use strlen(argv[1]) to find the lenght of the string.
> > > >
> > > > --
> > > > cheers,
> > > > Vadi
> > > > -
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> >
> >
> >
> >
> >
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> ______________________________________
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