Declare middle initial as a character variableģ. The use of a variable with a garbage value will cause a logical error-another type of error that is very difficult to find.ġ. By initialize, we mean assigning a valid value to a variable. What is the value of the variable initially? īy default, the value of a variable in C is GARBAGE, meaning there is something stored in that memory space but that something is invalid for the intended use.Ī variable must be properly initialized. Note that the use of the underscore makes the variable name easy to read. It is better to use a variable name such as rate or hourly_rate. For example, if you know that a variable will represent the hourly rate of a part-time worker, then don't use names such as xyz or x1. It is recommended, however, as a good programming practice for you to use a name that is descriptive or suggestive. Yes, as long as you follow the naming conventions, and do not use the C reserved words. A missing comma will generate a syntax error.Ĭan I use any name for the variables? In such a case, a comma should be inserted between two variables. It is possible to declare several variables of the same type on the same line. Variables should be named following the C naming conventions. Primary data types (Basic data types OR Predefined data types) Derived data types (Secondary data types OR User-defined data. In the c programming language, data types are classified as follows. data types are used to declare variable, constants, arrays, pointers, and functions. A missing semicolon will cause the compiler to generate a syntax error. The Data type is a set of value with predefined characteristics. A semicolon signifies the end of a declaration. The symbol means that it is required to specify the item enclosed within a pair of angled brackets. In C, the syntax for declaring a variable is as follows: If you forgot to do so, the compiler will report a syntax error. All variables in a C program must be declared. What is variable declaration? Ī variable declaration is an "action" by which a variable is "introduced" to a program/function. It is an operator that yields the size in number of bytes of the specified data type shown above.
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