Why int is 2 or 4 bytes?
The size of an int is really compiler dependent.
Back in the day, when processors were 16 bit, an int was 2 bytes.
Nowadays, it’s most often 4 bytes on a 32-bit as well as 64-bit systems.
Still, using sizeof(int) is the best way to get the size of an integer for the specific system the program is executed on..
What is sizeof C?
CProgrammingServer Side Programming. The sizeof operator is the most common operator in C. It is a compile-time unary operator and used to compute the size of its operand. It returns the size of a variable. It can be applied to any data type, float type, pointer type variables.
What is sizeof () operator?
The sizeof is a keyword, but it is a compile-time operator that determines the size, in bytes, of a variable or data type. The sizeof operator can be used to get the size of classes, structures, unions and any other user defined data type. The syntax of using sizeof is as follows − sizeof (data type)
What does sizeof return?
Answer: sizeof returns the size of the type in bytes. Example: sizeof(char) is 100% guaranteed to be 1 , but this does not mean, that it’s one octet (8 bits). … The sizeof operator yields the size (in bytes) of its operand, which may be an expression or the parenthesized name of a type.
How is sizeof implemented?
To use the sizeof(), we can take the value using a variable x, using &x, it will print the address of it. Now if we increase the value of &x then it may increase in different way. If only one byte is increased, that means it is character, if the increased value is 4, then it is int or float and so on.
Which operator Cannot overload?
Most can be overloaded. The only C operators that can’t be are . and ?: (and sizeof , which is technically an operator). C++ adds a few of its own operators, most of which can be overloaded except :: and .
How much is an int?
Integer TypesTypeStorage sizeValue rangeint2 or 4 bytes-32,768 to 32,767 or -2,147,483,648 to 2,147,483,647unsigned int2 or 4 bytes0 to 65,535 or 0 to 4,294,967,295short2 bytes-32,768 to 32,767unsigned short2 bytes0 to 65,5355 more rows
Is sizeof a unary operator?
sizeof is a unary operator in the programming languages C and C++. The result of sizeof has an unsigned integer type that is usually denoted by size_t. … The operator has a single operand, which is either an expression or a data type cast.
Does sizeof include padding?
The sizeof for a struct is not always equal to the sum of sizeof of each individual member. This is because of the padding added by the compiler to avoid alignment issues. Padding is only added when a structure member is followed by a member with a larger size or at the end of the structure.
Is sizeof a keyword in Java?
sizeof operator is not available in Java. But, at times you may want to know size of your Java objects. … Number of header words in an object ( “class pointer” etc.), pointer size (32/64 bit) and alignment variations make object size dependent on VM implementation.
Is sizeof a preprocessor?
No. The conditional directives take a restricted set of conditional expressions; sizeof is one of the things not allowed. Preprocessing directives are evaluated before the source is parsed (at least conceptually), so there aren’t any types or variables yet to get their size.
What is sizeof int?
sizeof(int) returns the number of bytes used to store an integer. int* means a pointer to a variable whose datatype is integer. sizeof(int*) returns the number of bytes used to store a pointer. Since the sizeof operator returns the size of the datatype or the parameter we pass to it.