Become a Certified Professional. The memory size of the basic data types may change according to 32 or 64-bit operating system. A byte stores an 8-bit unsigned number, from 0 to 255. The types of data that information can be stored as are called data types. int data types in C is used to define integer numbers. For finding the size we need a sizeof() function defined under stdio.h. val: the value to assign to that variable. byte var = val; Parameters. But irrespective of the bit-size of the compiler and OS, the following rules are followed, such as - Data Type Size Range; char: at least 1 byte-128 to 127: unsigned char: Memory size of a variable of integer data type is dependent on Operating System, For example size of an integer data type in a 32 bit computer is 4 bytes whereas size of integer data type in 16 bit computer is 2 bytes. BYTE is defined in WinDef.h. Reference > Language > Variables > Data types > Byte byte [Data Types] Description. C++ offers a predefined data type that is one byte in size, which can hold exatly one character such as ‘a’ or ‘A’. C language supports both signed and unsigned literals. C supports following data types: • int – occupies 4 bytes of memory in 32-bit compiler • float – occupies 4 byes of memory • double – occupies 8 bytes of memory • char – occupies 1 byte of memory. Primitive Data types in C In C, the number of bytes used to store a data type depends on the Compiler(depending on the bit size of a compiler and also the OS). Let's see the basic data types. Character data type allows a variable to store only one character. 1 byte = 8 bits . Properties such as, type of data, range of data, bytes occupied, how these bytes are interpreted etc. If you are programming C for Windows I assume you are using Visual Studio to develop. You can right click on any keyword and select Go To Definition F12 to find where it is defined. • Type of the data stored • Number of bytes it occupies in memory. Its size is … char ch='a'; The storage size of character data type is 1(32-bit system). Data type is a system for defining various properties of data stored in memory. Data types in C is classified in three broad categories - Primitive, Derived, User defined data type. Integer data type is used to store a value of numeric type. Read More. Basic Data Types. var: variable name. Syntax. We can store only one character using character data type. Properties such as, type of data, range of data, bytes occupied etc. typedef unsigned char BYTE; In turbo c/c++ the size of int is 2 bytes but in the compiler like code blocks, dev c/c++ e.t.c is 4 bytes. sizeof() function find the size in bytes. See also. char keyword is used to refer character data type. 0 or 1 takes 1 bit space. For example, 'A' can be stored using char datatype. Data Types in CThere are several different ways to store data in C, and they are all unique from each other. 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