Types of C Variables

Types of C Variables


As we saw earlier, an entity that may vary during program execution is called a variable. Variable names are names given to locations in memory. These locations can contain integer, real or character constants. 

In any language, the types of variables that it can support depend on the types of constants that it can handle.This is because a particular type of variable can hold only the same type of  constant. 

For example, an integer variable can hold only an integer constant, a real variable can hold only a real constant and a character variable can hold only a character constant.


The rules for constructing different types of constants are different. However, for constructing variable names of all types the same set of rules apply. These rules are given below.

Popular posts from this blog

SQL Basic- SQL Syntax

Image
          SQL Syntax:            SQL Syntax Database Tables A database contains one or more tables. Each table is identified by a name (e.g. "Student" or "Product").  Tables contain records (rows) with data. Below is a selection from the " Student " table: StudentID             StudentName               Address                Country 1             Ajay               Noida                India 2             Ajeet               Bareilly                India 3             Shivam               Nagaland...
Read more

Type Declaration Instruction in C

Type Declaration Instruction This instruction is used to declare the type of variables being used in the program. Any variable used in the program must be declared before using it in any statement. The type declaration statement is written at the beginning of main( ) function. Ex.: int bas ; float rs, grosssal ; char name, code ; There are several subtle variations of the type declaration instruction. These are discussed below: While declaring the type of variable we can also initialize it as shown below. int i = 10, j = 25 ; float a = 1.5, b = 1.99 + 2.4 * 1.44 ; The order in which we define the variables is sometimes important sometimes not. For example, int i = 10, j = 25 ; is same as int j = 25, j = 10 ; However, float a = 1.5, b = a + 3.1 ; is alright, but float b = a + 3.1, a = 1.5 ;         is not. This is because here we are trying to use a even before defining it. The following statements would work int a, b, c, d ; a = b = ...
Read more

SQL Basic- SQL Commands

Image
          SQL Commands                       The SQL commands to interact with relational databases are: CREATE,  SELECT,  INSERT,  UPDATE,  DELETE and  DROP.               These commands can be classified into groups based on their nature:           DDL - Data Definition Language.            DML - Data Manipulation Language.            DCL - Data Control Language.
Read more