Re: [Dev-C++] Dev-cpp-users Digest, Vol 23, Issue 11

[<Geo...@ao...>]

Take a look at this information from "The C Programming Language by  K&R".  
Page 148.  
 
Unions may hold objects of different types and sizes, with the compiler  
keeping track of size and alignment requirements.  
 
struct {
    char *name;
    int flags;
    int utype;     //  Use utype to indicate what the variable type is..... 
    union u_tag {
        int      ival;
        float  fval;
        char *sval;
    } u;
} symtab[NSYM];
 
the member ival is referred to as symtab[i].u.ival
the first character of the string sval by either of *symtab[i].u.sval or  
symtab[i].u.sval[0]
 
u is large enough to hold the largest of the three types; the specific size  
is implementation-dependent. 
 
if        (utype ==  INT)        Do Something;
else if (utype == FLOAT)   Do Something;
else if (utype == STRING) Do Something;
else  Do Something;
 
I typed it in fast so check it out.  Hope this gives you a clue.
 
George
 
 



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