You can print a pointer value using printf with the %p format specifier. To do so, you should convert the pointer to type void * first using a cast (see below for void * pointers), although on machines that don't have different representations for different pointer types, this may not be necessary.
If you want to print the value of a pointer without using the format %p specifier, you can cast the pointer to an integer that has the same size and then print the integer value. int x; Serial. println (&x, HEX);
%p is a format specifier in C Programming language, that is used to work with pointers while writing a code in C.
To print the values stored in a void pointer, we can use the C-style casting. For Example : cout << *((int*)ptr); Here ptr is a void pointer that contains the address of an int variable.
Pointers can be de-referenced using the asterisk * operator to get the value stored in an address. Like variables, instructions of a function are also stored in memory and have an address. A pointer pointing to the address of a function is called function pointer.
To get the value pointed to by a pointer, you need to use the dereferencing operator * (e.g., if pNumber is a int pointer, *pNumber returns the value pointed to by pNumber . It is called dereferencing or indirection).
To print the address of a variable, there is one unique format specifier, that is %p. So, you can use the %p format specifier to print the memory location address. Let's use printf to print the Address of variable a1. So, the Address of variable a1 is equal to you can use the format specifier %p here.
What is the use of `%p` in printf in C? In C we have seen different format specifiers. Here we will see another format specifier called %p. This is used to print the pointer type data.
For the program to be well-defined, the format specifier must match the type of the argument. Therefore you can use %p but not %d to print out pointers. (The latter might happen to work on some architectures but is technically undefined behaviour.)
using printf()
If we want to do a string output in C stored in memory and we want to output it as it is, then we can use the printf() function. This function, like scanf() uses the access specifier %s to output strings. The complete syntax for this method is: printf("%s", char *s);
we now see that the format specifier "%. 2f" tells the printf method to print a floating point value (the double, x, in this case) with 2 decimal places. Similarly, had we used "%. 3f", x would have been printed rounded to 3 decimal places.
A pointer to a string in C can be used to point to the base address of the string array, and its value can be dereferenced to get the value of the string. To get the value of the string array is iterated using a while loop until a null character is encountered.
What are Pointers? A pointer is a variable whose value is the address of another variable, i.e., direct address of the memory location. Like any variable or constant, you must declare a pointer before using it to store any variable address.
Dereferencing array of pointer
Since each array index pointing to a variable's address, we need to use *arr[index] to access the value stored at the particular index's address. *arr[index] will print the value.
In Go, to print the memory address of a variable, struct, array, slice, map, or any other structure, you need to generate a pointer to the value with the address operator & and use the fmt. Println() function (or any other print function from the fmt package) to write the value address to the standard output.