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WHAT IS ARITHMETIC OPERATOR

OPERATOR
Operators are the symbols that are used to perform certain operation on data. C provides a variety of operators. Different types of operators in C are as follows:

• Arithmetic Operators
• Relational Operators
• Logical Operators
• Assignment Operators
• Increment and Decrement Operators
• Compound Assignment Operators

Keyboard:

KEYBOARD
Keyboard is a device that converts letters, numbers, and other characters into electrical signals that are machine readable by the computer processor. The keyboard may look like a type writer keyboard to which some special keys have been added. Keyboard has 3 categories.
1. Alphabet keys (A,B,C..Z, a,b,c.....z)
2. Numeric Keys (1,2,3,4,5....10)
3. Special Keys (F1,F2,.....F12, Alt, Ctrl, Shift, Tab, Capslock, enter...etc).
The standard keyboard has 101 buttons on it and now there are 104,106,110 keyboards are available in the market.

C LANGUAGE

KEYWORDS IN C LANGUAGE
Keywords have predefined meaning and purpose. The meaning and purpose of a keyword is defined by the developer of the language. It cannot be changed or redefined by the use. Keyword can be used for the same purpose for which it is defined. Keywords are also known as reserved words. There are different types of keywords in C language. The total number of keywords is 32.

FOUNDAMENTAL OF COMPUTER

INPUT DEVICES
 Input devices consist of hardware that translate data into a from the computer can process. The people readable form my be words like the ones in these sentences, but the computer readable form consists of 0's and 1's or off and on electrical signals. Input hardware devices are categorized as three types.
1. Keyboard 2. Pointing devices 3. Source data entry devices.

C Language

IDENTIFIER?

 The Identifier are the names used to represent variable, constants, types, functions and labels in the program. An identifier in C may consist of 31 characters. If the identifier long than 31 characters, the remain character will be ignored by the C compiler.

RULES FOR IDENTIFIER

Some-important rules for identifier name are as follows.

• The first character must be an alphabet or underscore (_).
• The identifier name must consist of only alphabetic characters, digits, or underscores.
• The reserved word cannot be used as identifier name.

                                       TYPES OF IDENTIFIERS
                                       There are two types of identifiers in C language.
                                       i) Standard Identifiers
                                      ii) User-defined Identifiers

CPU

CPU
The CUP (Central Processing Unit) the "brain" of the computer follows the instruction of the software to manipulate data into information. The CPU consists of two parts
i) The Control Unit
ii) The Arithmetic Logic Unit.
The two components are connected by a kind of electric "roadway" called a bus.
THE CONTROL UNIT
The control unit tells the rest of the computer system how to carry out a program instructions. It directs the movement of electronic signals between the main memory and the arithmetic / logic unit. Its also directs these electronic signals between main memory and the input and output devices.
THE ARITHMETIC / LOGIC UNIT
The arithmetic logic unit (ALU) performs arithmetic operations and logic operations and control the speed of those operations. In simple words the arithmetic unit performs the simple mathematical functions like Division, Multiplication, addition and subtraction.
The logical operations are the comparisons between two things e.g. >,<,=or not =. The speed of the CPU is expressed in MHz. The latest CPU, which is available in the market is 2GB manufactured by Intel and AMD (the two largest companies of processors).