Set Value for structure in C

Besides the indexing mistake, something else is wrong too.
The proposed method of initialising a structure can be used only in the declaration, not afterward.

So this would be fine:

static struct{
    int  aaa;
    char bbb;
    int  ccc;
    char ddd;
}form[2] = {8,'a',6,'b',9,'s',5,'v'};

But to modify it later, you would have to do it like this:

form[1].aaa =  9;
form[1].bbb = 's';
form[1].ccc =  5;
form[1].ddd = 'v';

The answer is Yes No; If you have access to a computer and a c compiler, then you should figure this out yourself.