OOPS - Please give me clear idea about these following declaration.const char *q="hello";*q='m';/*error*/q=

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Please give me clear idea about these following declaration.

const char *q="hello";
*q='m';/*error*/
q="bye";

char const *s="hello";
*s='m';/*error*/
s="bye";

char *const t="hello";
*t='m';/*works*/
t="bye";/*error*/

Total Answers and Comments: 3

Last Update: November 17, 2007 Asked by: pradyumna amanta

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July 18, 2006 04:30:13

ashish

RE: Please give me clear idea about these following de...

when we declare a pointer like int *a anything before * tels ihe type of variable of which addres the ponter will store.

like in this case a will store the address of a int type

and everything after * tells about the tupe of the pointr

like in const char * const p

const char is the type of var whose address will bestored in p while const after * tells about the ponter itself that is it is a constant pointer

now in ur prog. when u write const char *q hello it means that hello is a constant and can;t be modified hence *q 'm' an error

while in char *const p hai p is aconst ponter so p bye is not valid.

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September 13, 2006 03:22:20

prema

RE: Please give me clear idea about these following de...

const char *q hello ;
*q 'm';/*error*/
q bye ;

char const *s hello ;
*s 'm';/*error*/
s bye ;

char *const t hello ;
*t 'm';/*works*/
t bye ;/*error*/

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November 17, 2007 14:42:19

ardashev

Member Since: November 2007 Contribution: 6

RE: Please give me clear idea about these following de...

#include <stdlib.h>
#include <stdio.h>
int main()
{
const char *q "hello";
// "hello" sits in a memory location and cannot be changed
printf(" p sn" q q);
q "bye";
// "bye" is created in a different location in memory and a new pointer is created for it
// original "hello" is not changed and cannot be since it is const only the pointer which is not const is changed ( beware though that you loose pointer to "hello" altogether here)
printf(" p sn" q q);
return 0;
}
// output:
// 0x4005e8 hello
// 0x4005f6 bye

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