Reallocate CString on Heap

Hi,

I have created a CString as:

Code:

---

char* p = malloc(3);
p[0] = '1'
p[1] = '1'
p[2] = '1'

---

Now, I want to change the string to: "He"

Code:

---

char* p = "He"

---

But this reallocates the pointer adress. How to go around this?

Do this.

strcpy(p,"He");

#I am stupid
Thank you!

I think it'd be more illustrating to change the string manually at this stage.

Code:

---

#define NULL_TERMINATION 1
#define STR_SIZE 3 + NULL_TERMINATION

char *p = malloc(STR_SIZE * sizeof(*p));
p[0] = '1';
p[1] = '1';
p[2] = '1';
P[3] = 0;
//How do we change the string to "he"?
p[0] = 'h';
p[1] = 'e'
p[2] = 0; //Otherwise we end up with "he1"

---

Note that by convention, all strings in c should end with a 0 (technically a '\0' or null character which is normally 0, but it might not be in some obscure platform) which marks the end of the string. Library functions like strlen expect that, and won't work well without it.

> char *p = malloc(STR_SIZE * sizeof(*p));
Oooh, watch out for that operator precedence.

Always put ( ) around all your #define expressions.

> (technically a '\0' or null character which is normally 0,
The ISO standard says it's always 0 (see 5.2.1 Character sets)