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Using character pointers Posted by talhanasir on 8 Jun 2006 at 12:25 AM

How come the value of last cout statement is
My sister's married name is name was

char *c = "Bettye Lou Horn";
cout << "My sister's maiden name was" << c << "\n";
c = c+11; // Make c point to the last name (the 12th character)
c = "Henderson";
c = c - 11; // Make c point to its original location.
cout << "My sister's married name is" << c << "\n";
// when we use *c in cout statement only B prints why

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Re: Using character pointers Posted by Lundin on 8 Jun 2006 at 1:52 AM

: c = "Henderson";

You can't do this. You will set the pointer to point at a new location - the static string "Henderson". It will forget where it pointed at before.

: c = c - 11; // Make c point to its original location.
So when you subtract 11 here you are pointing at a non-valid memory location. The program will likely crash here.

Try something like this instead:

char str[21] = "Bettye Lou Horn"; 
/* Make str an array of chars large enough to hold "Bettye Lou Henderson" = 20 letters + 1 null termination */

char* lastName = "Henderson";

cout << "My sister's maiden name was " << str << endl; 

strcpy(str+11, lastName);

cout << "My sister's married name is " << str << "\n";

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Re: Using character pointers Posted by AsmGuru62 on 8 Jun 2006 at 4:29 AM

This message was edited by AsmGuru62 at 2006-6-8 4:29:39

: char str[21] = "Bettye Lou Horn"; 
: /* Make str an array of chars large enough to hold "Bettye Lou
 Henderson" = 20 letters + 1 null termination */
: 
:

:
Just one small addition: if you omit the value in brackets the compiler will allocate memory exactly enough to hold a string, so you do not have to count symbols:
:

: char str[] = "Bettye Lou Horn"; 
:

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Re: Using character pointers Posted by Lundin on 8 Jun 2006 at 4:38 AM

: This message was edited by AsmGuru62 at 2006-6-8 4:29:39

: :

: : char str[21] = "Bettye Lou Horn"; 
: : /* Make str an array of chars large enough to hold "Bettye Lou
:  Henderson" = 20 letters + 1 null termination */
: : 
: :

: :
: Just one small addition: if you omit the value in brackets the compiler will allocate memory exactly enough to hold a string, so you do not have to count symbols:
: :

: : char str[] = "Bettye Lou Horn"; 
: :

:
:
:
:

Yep, but in this case it should be initialized to
"Bettye Lou Horn" but be large enough to be able to hold
"Bettye Lou Henderson"

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Re: Using character pointers Posted by AsmGuru62 on 8 Jun 2006 at 11:55 PM

: : This message was edited by AsmGuru62 at 2006-6-8 4:29:39

: : :

: : : char str[21] = "Bettye Lou Horn"; 
: : : /* Make str an array of chars large enough to hold "Bettye Lou
: :  Henderson" = 20 letters + 1 null termination */
: : : 
: : :

: : :
: : Just one small addition: if you omit the value in brackets the compiler will allocate memory exactly enough to hold a string, so you do not have to count symbols:
: : :

: : : char str[] = "Bettye Lou Horn"; 
: : :

: :
: :
: :
: :
:
: Yep, but in this case it should be initialized to
: "Bettye Lou Horn" but be large enough to be able to hold
: "Bettye Lou Henderson"
:
I see... I stand corrected.

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