Re: Whats the deal with 'const'?


Malcolm wrote:
The second problem is this

struct employee
{
char *name;
float salary;
};

void payroll(const employee *emp)

? void payroll(const employee **emp)

{

/* evil hacker */
strcpy(emp[0]->name, "Fred the Hacker");

? strcpy(emp->name, "Fred the Hacker");

pay(&emp[0]);
}

void payroll(const employee *emp);

In this case, the const keyword qualifies the object it points to as
constant. The object `name' is that one pointed by emp, so this is an
error:
/*(*emp).name = "C";*/

The object `*name' is pointed by name, not emp. That const does not
prevent following from being done:
*(*emp).name = 'c';

? void payroll(const employee **emp)

So does the const keyword applying to multiple-level pointer.
/*(**emp).name = "C";*/
*(**emp).name = 'c';

lovecreatesbeauty

.

Relevant Pages

  • Re: PPP Payroll Example
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  • Re: Whats the deal with const?
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  • Re: problems in saving to a text file
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    (alt.comp.lang.learn.c-cpp)