String Pointers

We said we could not assign or change the value of the pointer cell corresponding to the name of a string variable, but we can declare another

character pointer, assign it a value (or pass its value in a function), and use it as a string:

           char str[81] = "This is a string";

           char *s;

This declares a string, str, and an unitiialized character pointer, s.

We can initialize it:

               s = str;

Now, s refers to the same string as str.

We can also modify the value of s:

                s = str + 2;

What is the value of S?

Now, s refers to a substring of str; namely "is is a string".

That is what we would get if we

        printf("%s\n",s);

What is the value of *s?

We can also

                s++;

Now, s refers to a different substring of str; namely "s is a string".

That is what we would get if we

        printf("%s\n",s);

What is the value of *s, now?