In C/C++, precedence of Prefix ++ (or Prefix –) has higher priority than dereference (*) operator, and precedence of Postfix ++ (or Postfix –) is higher than both Prefix ++ and *.
If p is a pointer then *p++ is equivalent to *(p++) and ++*p is equivalent to ++(*p) (both Prefix ++ and * are right associative).
For example, program 1 prints ‘h’ and program 2 prints ‘e’.
// Program 1 #include<stdio.h> int main() { char arr[] = "geeksforgeeks"; char *p = arr; ++*p; printf(" %c", *p); getchar(); return 0; } |
Output:
h
// Program 2 #include<stdio.h> int main() { char arr[] = "geeksforgeeks"; char *p = arr; *p++; printf(" %c", *p); getchar(); return 0; } |
Output:
e
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