![]() Note: The number of bytes applies to both X86 (32-bit) and X64 (64-bit) compilers. Function of the number of bytes used to store the content, integer variables can be:įor a 32-bit compiler, the differences between the integer data types are summarised in the table below: Data type This mean that it can contain both positive and negative numbers ( signed) or only positive numbers ( unsigned). This means that only the integer part of the number 3.1416 was memorised, since uiVar was declared as an integer.Īn integer can be signed or unsigned. Printf("Integer variables can not store decimals\n") Īs expected, the comparison uiVar=3 is true (since the message is displayed). With an if statement we check if the value memorised in the variable is only the integer part of the value, if true we print a message. In the example below we’ll declare a variable of type integer and we’ll assign a non integer value to it. Variables declared as integers store only integer numbers (e.g. The integer data type is also knows as fixed-point type. It’s mainly used for function definition as return type or argument of the function. The void type has no value and unknown size. Note: Depending on the type of the compiler (16-bit or 32-bit), the size and range of int, short and long are different. Image: C programming language – standard data types The main data types in C programming language are: Variables can be declared and defined in the same instruction: unsigned int uiVar = 25 The definition of the variable can be done in another line, but only after the declaration: uiVar = 25 Int – keyword which defines that our variable is an integer and has 4 bytes of memory allocated (for a 32-bit compiler) Unsigned – keyword which defines that our variable is always positive (without the sign “-“) In the C programming language a variable is declared as: unsigned int uiVar which are the properties of the standard data types.what is the significance of a data type.the restrictions which are applied in terms of operationsīy the end of this tutorial the reader will know:.the types of operations that can be performed on the variable.the memory size to be allocated to store the content of the variable.By assigning a certain data type to a variable we define several aspects linked to the variable: In the C programming language every variable used in the source code needs to be declared by setting its data type. The second concept is the definition of the variable, which means setting its content. There are two main concepts regarding variables. The fist concept is the declaration of the variable, which basically means setting its data type. The variable can be seen as the “place” to store “things” as: numerical values, characters, text strings, memory addresses, etc. One of the most important concept in programming is the variable.
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