Some problems with string

Question

I have just reached to strings in c language...
"when you declare a char pointer like char *p="String"; it will be constant "
I tried to ensure of this put I couldn't print *p Why?
the compiler take the pointer as integer not as a string

https://code.sololearn.com/cLn5IBVBgtik/?ref=app

Answer 1

‎‏‪ABADA S‬‏‎ I guess they meant to say that it can't be changed because the pointer *str points to a string literal rather than a string variable, a string literal can't be changed as their value is not stored in a variable, hence we can't modify its content. I'm not really good in explaining, especially if it comes to pointers ; )

I hope someone more knowledgeable can drop some extra hints on this, to get a better comprehension : )

Answer 2

Prints "ABADA", notice you don't need dereference operator '*' before 'x'.
printf("%s", x);

Prints 'A', the first char in 'x'.
printf("%c",*x);

Answer 3

thanks you Ipang & Matthias
I got it but in the lesson they said that it can not be changed .. I edited the code below and changed the value so what was that mean

Answer 4

A string pointer declaration such as char *str = "stuff"; is considered a constant and cannot be changed from its initial value.

that what is written exactly but the string is not constant Ipang

Answer 5

thank you

Answer 6

thank you I think I got it
both of strings have been existed befor compiling and the pointer is just indicating to it so if I write again x="ABADA"; the address will be the same to the first address

what does %p means

Answer 7

so I can change the string to other one with regardless of length but I can't change a single char ... isn't it?

Answer 8

thank you very much master Ina and thanks for who try to help me
I appreciate your aid

Answer 9

It doesn't take the pointer as integer, but if you use format specifier %d it will implicitly cast char to int and show its ASCII value.

As you dereferenced, it will output the value at the position that x points to (which is a char A).
Using strings you do not need to derefernce it, as Ipang said. You only need the starting position x and because you tell via format specifier %s that it is a string, it will print all characters until the termination character '\0' is hit.
This termination character has been included automatically when defining the string.

Answer 10

‎‏‪ABADA S‬‏‎ I'm sorry, I haven't read the C lesson yet, so I don't really understand what you mean by "they said that it can not be changed", what exactly they said can't be changed? elaborate some more maybe?