Table of Contents
What is the size of NULL in C?
Most of the implementations of NULL in C are casted as (void *) . Therefore the size of NULL is 8 bytes if casted as (void *) or 4 bytes if casted as integer. Although, most implementations in C++ define NULL as integer 0, making its size as 4 bytes.
What data type is NULL?
NULL is undefined and every column can have NULL values except columns with timestamp datatype (which represent NULL values differently). There is a simple method to know the default datatype of NULL values. You will find that the default datatype is an Integer.
Is NULL a type?
Type: Null (Japanese: タイプ：ヌル Type: Null) is a Normal-type Legendary Pokémon introduced in Generation VII. It evolves into Silvally when leveled up with high friendship.
What does sizeof NULL return?
sizeof(NULL) is not nothing, but a pointer to the address 0, and a pointer on a 32 bit system takes 4 bytes.
What is long long in C?
The long long takes twice as much memory as long. In different systems, the allocated memory space differs. On Linux environment the long takes 64-bit (8-bytes) of space, and the long long takes 128-bits (16-bytes) of space. This is used when we want to deal with some large value of integers.
What is the size of Long in C?
8 bytes
Integer Types
| Type | Storage size | Value range |
|---|---|---|
| short | 2 bytes | -32,768 to 32,767 |
| unsigned short | 2 bytes | 0 to 65,535 |
| long | 8 bytes or (4bytes for 32 bit OS) | -9223372036854775808 to 9223372036854775807 |
| unsigned long | 8 bytes | 0 to 18446744073709551615 |
What is a null value?
A null value indicates a lack of a value, which is not the same thing as a value of zero. SQL null is a state, not a value. This usage is quite different from most programming languages, where null value of a reference means it is not pointing to any object.
Can integer be null?
Primitive types such as integers and Booleans cannot generally be null, but the corresponding nullable types (nullable integer and nullable Boolean, respectively) can also assume the NULL value.
Is null a type in C?
The type of NULL may be either an integer type or void * . This is because the C standard allows it to be defined as either an integer constant expression or the result of a cast to void * .
Is null a value in C?
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.
What is null in C with example?
Thus, a C implementation may define NULL as, for example: (1+5-6), which is an integer constant expression with value 0 and type int. Even though NULL may have an integer type, it may be compared to and assigned to pointers, as in if (p == NULL) ….
What is nullable type in C with example?
Nullable Type in C#. As you know, a value type cannot be assigned a null value. For example, int i = null will give you a compile time error. C# 2.0 introduced nullable types that allow you to assign null to value type variables.
What is the range of a nullable in Java?
Nullable i = null; A nullable type can represent the correct range of values for its underlying value type, plus an additional null value. For example, Nullable can be assigned any value from -2147483648 to 2147483647, or a null value.
What is the type of a null pointer in C++?
If a null pointer constant has integer type, it may be converted to a prvalue of type std::nullptr_t . In C, the macro NULL may have the type void*, but that is not allowed in C++.