C : array of struct (which holds an int and another array of another struct)

Question

struct dataStruct {     const char* s;     int num; }; 

struct Final_struct {     int n;     dataStruct a[]; };

Now the problem occurs when I try to initialize the Final_struct as followed:

const Final_struct Example[]= {
                                {100, { {"age", 20}, {"iq", 120}, {"bmi",26} } },
                                {100, { {"age", 36}, {"iq", 145}, {"bmi",22} }}
};

It's a c code, and when I try to compile it gives the compiler error :

Fields of the object can not have arrrays of size 0

Any suggestions?

thank you.

You should have gotten tons of compiler errors, not just one... — oh whatever
– oh whatever, Commented Jun 10, 2011 at 8:15

Blagovest Buyukliev · Accepted Answer · 2011-06-10 08:14:34Z

5

dataStruct a[] defines the member of the struct as an array of size 0. This is practically useless. You need to specify its size in the definition of the struct because the compiler needs to know the size of the entire struct in advance.

Or, you can simply declare the field as dataStruct *a and then the array itself will not be contained in the struct.

answered Jun 10, 2011 at 8:14

Blagovest Buyukliev

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Comments

unwind · Accepted Answer · 2011-06-10 08:13:24Z

1

If this is C, what is string ? Why do you expect to be able initialize it from what looks like other variables?

Try const char * for s, and initialize from quoted string literals.

answered Jun 10, 2011 at 8:13

unwind

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Comments

Martin Kristiansen · Accepted Answer · 2011-06-10 08:13:36Z

0

did you forget quotes on your strings?

"age"

answered Jun 10, 2011 at 8:13

Martin Kristiansen

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1 Comment

Jasmin Over a year ago

thanks for noticing, but that is not the problem ... I made an error while writing the example. will correct it.

jv42 · Accepted Answer · 2011-06-10 08:13:51Z

0

Have you tried putting double quotes around your string constants?

answered Jun 10, 2011 at 8:13

jv42

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Michael Burr · Accepted Answer · 2011-06-10 08:27:57Z

0

Any suggestions?

Try:

/* note the explicit array size for a[] */
struct Final_struct {     int n;     struct dataStruct a[3]; };

answered Jun 10, 2011 at 8:27

Michael Burr

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1 Comment

Jasmin Over a year ago

Thank you. I seriously doubt my coding capabilities sometimes.

baalu · Accepted Answer · 2011-06-10 10:03:16Z

0

the array 'a' which is declared inside the structure named Final_struct should have the size. with out know the size of that variable the compiler can't assign the memory for that variable. so you should allocate the size first...

answered Jun 10, 2011 at 10:03

baalu

1

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