C PROGRAMMING QUESTION

Given this code, I know that

"XYZ" + 1  
Evaluates to 1 (True).
 
Can you please explain how the truth value of the comparrison between two pointers works? For example, on the left side we have s which is a pointer and then "XYZ" + 1 which is a char array in a different location. How are they being compared?
  struct Node struct Node *next; int x; 1i void f(char *t, const char *s) { while ((*e++ = *s++) != 0) ; } void g(char *t, const char *s) f while (*t) t+t; f(t, s)ih int main(int argc, char **argv) struct Node node[1]; char a7] - "ABCDEF" char *p - a+ 2; char *smalloc (16) fs, a) g(s, p); // main () continues... // Evaluate the expressions in the context of main) at this point.  struct Node struct Node *next; int x; 1i void f(char *t, const char *s) { while ((*e++ = *s++) != 0) ; } void g(char *t, const char *s) f while (*t) t+t; f(t, s)ih int main(int argc, char **argv) struct Node node[1]; char a7] - "ABCDEF" char *p - a+ 2; char *smalloc (16) fs, a) g(s, p); // main () continues... // Evaluate the expressions in the context of main) at this point