2025年1月10日 · The sizeof operator in C is a compile-time unary operator used to determine the size of data types and expressions, returning the size in bytes, which is essential for memory allocation and array element counting.

2024年8月14日 · 1) Yields the size in bytes of the object representation of type. 2) Yields the size in bytes of the object representation of the type of expression, if that expression is evaluated. The result of a sizeof expression is a constant expression of type std::size_t.

2021年8月2日 · The sizeof operator gives the amount of storage, in bytes, required to store an object of the type of the operand. This operator allows you to avoid specifying machine-dependent data sizes in your programs.

2023年7月4日 · Queries size of the object or type. Used when actual size of the object must be known. Both versions return a value of type size_t. 2) Returns the size, in bytes, of the object representation of the type of expression. No implicit conversions are applied to expression.

2021年8月2日 · Yields the size of its operand with respect to the size of type char. For information about the sizeof ... operator, see Ellipsis and variadic templates. The result of the sizeof operator is of type size_t, an integral type defined in the include file <stddef.h>.

To actually get the size (in bytes) of a data type or variable, use the sizeof operator:

2024年12月9日 · The sizeof operator is a unary compile-time operator used to determine the size of variables, data types, and constants in bytes at compile time. It can also determine the size of classes, structures, and unions.

The sizeof operator is a compile−time unary operator. It is used to compute the size of its operand, which may be a data type or a variable. It returns the size in number of bytes. It can be applied to any data type, float type, or pointer type variables.

6 天之前 · When traversing through open source projects written in C, it's common to stumble upon a mixture of coding practices, especially concerning the use of the sizeof() operator versus hardcoded array sizes. One particular practice that often raises questions is whether to utilize sizeof() or hardcoded values for buffer sizes, especially in functions like memset() and snprintf().

2024年12月26日 · In order to determine the size of data types on a particular machine, C++ provides an operator named sizeof. The sizeof operator is a unary operator that takes either a type or a variable, and returns the size of an object of that type (in bytes).