- What are the fundamental data types in C++ and their respective sizes?
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In C++, there are several fundamental data types with their respective sizes. Some of the common data types are:
1. Integer Types:
– `int`: Typically 4 bytes on most systems.
– `short`: Usually 2 bytes.
– `long`: Typically 4 bytes, but it can vary across different systems.
– `long long`: Generally 8 bytes.
2. Floating-Point Types:
– `float`: Usually 4 bytes, representing single-precision floating-point numbers.
– `double`: Typically 8 bytes, representing double-precision floating-point numbers.
3. Character Types:
– `char`: Typically 1 byte, representing a single character.
– `wchar_t`: Platform-dependent, typically 2 or 4 bytes, used for wide characters.
4. Boolean Type:
– `bool`: Typically 1 byte, representing `true` or `false` values.
5. Other Types:
– `void`: Represents the absence of a type or value. It has no size.
– Pointers: The size of a pointer depends on the underlying system architecture.
C++ provides fundamental data types that serve as building blocks for constructing programs. These data types have varying sizes depending on the platform, compiler, and implementation. Here are the commonly used data types and their typical sizes:
It’s important to note that the sizes mentioned here are common conventions, but they can vary depending on the compiler and system architecture. To obtain the precise sizes of data types on a specific platform, the sizeof operator can be used. For instance, sizeof(int) would yield the size of an int in bytes for the target system.