Can I print null in C?

Can I print null in C?

First things first: printf is expecting a valid (i.e. non-NULL) pointer for its %s argument so passing it a NULL is officially undefined. It may print “(null)” or it may delete all files on your hard drive–either is correct behavior as far as ANSI is concerned (at least, that’s what Harbison and Steele tells me.)

Does printf print null?

Just asking, because the printf-source somehow interprets the zero pointer and prints out (null) ( so in the printf-source, the behavior is specified, which was the point of this comment-question).

What does null mean when printed?

N. A character that is all 0 bits. Also written as “NUL,” it is the first character in the ASCII and EBCDIC data codes. In hex, it displays and prints as 00; in decimal, it may appear as a single zero in a chart of codes, but displays and prints as a blank space.

What happens if you try to print a null pointer in C?

The C standard makes it undefined to pass anything other than a pointer to a null-terminated string as second argument to printf(“%s”, .

Do null pointers have addresses?

What is a NULL pointer? NULL is a predefined Macro, and its value is 0 (since 0 is not a valid memory address, thus we can consider that NULL can be used for nothing or no address).

What does null address mean?

Null addresses, literally <>, are used for email where it’s not important to know if it wasn’t delivered. If the mail fails to deliver it usually is just dropped on the floor and no one ever knows anything.

What is null in C programming?

In computer programming, null is both a value and a pointer. Null is a built-in constant that has a value of zero. It is the same as the character 0 used to terminate strings in C. Null can also be the value of a pointer, which is the same as zero unless the CPU supports a special bit pattern for a null pointer.

How do you declare a null string in Java?

null Values Let’s declare and initialize a null String: String nullValue = null; If we printed nullValue, we’d see the word “null”, as we previously saw. And, if we tried to invoke any methods on nullValue, we’d get a NullPointerException, as expected.

What is null in C?

What is null used for?

A null value in a relational database is used when the value in a column is unknown or missing. A null is neither an empty string (for character or datetime data types) nor a zero value (for numeric data types).

What is void pointer in C?

C. A void pointer is a pointer that has no associated data type with it. A void pointer can hold address of any type and can be typcasted to any type.

What happens if you print a null character?

The print expects a ‘\0’ terminated array of characters (or string literal) whereas it receives a null pointer. Passing NULL to printf is undefined behavior.