what is the identifier to print an address with printf?

The identifier (format specifier) to print an address with printf in C is %p. This specifier is used specifically for printing pointer (address) values. When using %p, the corresponding argument should be a pointer, and it is recommended to cast the pointer to (void *) for portability and compliance with C99 and later standards. For example:

c

int a = 10;
printf("%p\n", (void *)&a);

This prints the address of the variable a

. Using other specifiers like %u to print addresses is undefined behavior and should be avoided

. The %p specifier outputs the address in an implementation-defined format, typically hexadecimal. In summary:

• Use %p to print addresses.
• Pass the address cast to (void *) to printf.
• Example: printf("%p\n", (void *)&variable);

This is the standard and correct way to print an address with printf in C.