![]() ![]() The char variables can be used to store a character or string in memory location. ASCII stands for American Standard Code For Information Interchange. Each character stored in memory is associated with a unique value called ASCII value. It can also define sequence of characters called string. For instance, unsigned int will represent positive numbers.Ĭhar: This keyword is used to define single character. Usually we represent unsigned numbers by the keyword unsigned. We can store positive and negative numbers in memory. They are associated with variables to store signed integer values in memory locations. Int: This keyword is used to define integer numbers. We have the following types of primitive data types: Primitive data type is also called Basic data type or Simple data type or Fundamental data type. ![]() The type of value the variable will hold in memory is represented by data type. When we execute a program a variable can have different types of values in memory. It is not recommended to use underscore as identifier although it is a valid identifierĭata types are broadly categorized into two categories and they are as follows:ĭata type and variable are two different things.Length of an identifier can be up to a maximum of 32 characters.Any other symbols except letters, digits and “_” are not allowed.The first character in identifier should be a letter or “_” and can be followed by any number of letters or digits or underscore.There are certain rules which need to be followed while constructing identifiers and they are as follows: We can also say identifiers are sequences of alphabets and digits. Identifiers are the program elements like variables, arrays and functions. Following keywords are supported by ANSI C. There are only 32 keywords available in C. It is because it means that we are trying to assign a new meaning to keyword which is not permissible. The keywords cannot be used as variable names. C is a case sensitive language so uppercase and lowercase letters are significantly different. These meanings cannot change in any circumstance. ![]() ![]() They are sequence of characters which have one or more fixed meaning. In fact, every word in a C program is an identifier or keyword. Those words which have predefined meaning in C language are called keywords. Tokens are broadly categorized into following categories and they are as follows: Characters are grouped together to form meaningful words and these meaningful words are termed as Tokens. We can define token as the smallest unit of program. Symbols: This category include special symbols like :Īlphabets are combined together to form meaningful words called tokens. White spaces: Characters such as space, tab (\t), new line (\n), carriage return (\r), etc are included in C language and they are known as White spaces. Letters: Upper case letters from 'A' to 'Z' and lower case letters from 'a' to 'z'.ĭigits: This category include the digits from 0 to 9. The characters used in C language are generally categorized under following categories: This set of characters form the lexical elements. Every programming language has its own character set. The characters which are used to write C programs are called Character Set or alphabets. 3.1 Character Set (Alphabets of C language) As we have to learn alphabets to learn English language, similarly we will learn the alphabets to learn the C language. This chapter will introduce you to the first step of learning C language. ![]()
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