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Question by mattryan
Submitted on 5/30/2004
Related FAQ: comp.lang.c Answers to Frequently Asked Questions (FAQ List)
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what are the differences between the declarations:

char*const host = "mail.mailserver.com"

and

const char *host = "mail.mailserver.com"


Answer by soodacur
Submitted on 10/29/2004
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in the first declaration->
host is an unsigned constant that contains
a pointer to a character array.
in the second declaration->
host is an unsigned integer that contains
a pointer to a character array.
the difference here is that in the first case
the value that host contains can't be changed
but the contents of the location to which it
points can be changed while in the second case ,the value of host can be changed but
the contents of the location to which it
points can not be changed.

 

Answer by harish Kamalapurkar
Submitted on 11/9/2004
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char *const host = "mail.mailserver.com"

This declares the pointer host to be constant and not the string itself.

i.e *host = 'r' will work
but host = "harish" will give an error since const value cannot be modified.

const char *host = "mail.maiserver.com";

here the string i.e characters are constant and the string is not

host = "harish" will work
but *host = 'r' will not.

 

Answer by sheena
Submitted on 5/17/2005
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In First statement host is a pointer which is const and point to char. i.e in first declaration you can not change the address of host but u can change contents of host.

whereas in case of second statement, it declare host as pointer to char that happens to be const. i.e u can change the address of host but cannot change contents of host.

 

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