The document defines what a program, application, project, and programming language are. It states that a program is a precise sequence of steps to solve a problem, an application is a collection of programs, and a project is a collection of applications. It explains that a programming language is a vocabulary and set of rules for instructing a computer to perform tasks. The document also discusses high-level, low-level, and middle-level languages and provides examples of each. Finally, it provides an introduction to the C programming language, its history, reasons for learning it, and some definitions related to C.

2. What is a Program?
A Precise sequence of steps to solve a particular
problem.
Precise=exact
Sequence= what should be first, what should be second,
and so on..
And there should be any problem to solve.
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3. Application And Project
Application : Collection of Programs. E.g. Collection
of 4 programs of +, -, *, / is an application named
calculator
Project : Collection of Applications.
E.g.. Operating System, Word processors
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4. What is a programming Language?
A vocabulary and set of grammatical rules for
instructing a Computer to perform specific tasks.
Each language has a unique set of keywords (words
that it understands) and a special syntax for
organizing program instructions.
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5. Ask 6 different Computer
Scientists, get 6 different answers!
formal notation for computations
tool for writing programs
means of communicating between programmers
notation for algorithms
tool for experimenting with solutions to problems
means for controlling computerized devices
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6. Diff. B/w HLL,LLL,MLLHLL : High Level Language
User Friendly
Easy understandable to user
Computer details are hidden from user
E.g. COBOL, FORTAN, PASCAL, ADA
LLL : Low Level Language (Machine Language)
Composed of 0’s and 1’s only
Computer details are there
Not user friendly
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7. Totally Machine Understandable
MLL : Middle Level Language
• Mixture of both HLL and LLL
• User Friendly also
• E.g.. C language.
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8. Introduction to C Language
C is a programming language.
It was developed at AT & T’s Bell Laboratories of USA
in 1972.
It was designed and written by a man named Dennis
Ritchie.
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Dennis
Ritchie

9. Evolved from B, which evolved from BCPL
Designed for systems programming
Operating systems
Utility programs
Compilers
Filters
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10. Reasons to learn C
Main reason is its simplicity reliability, and its easy to
use and easy to learn
Major part of OS like windows, Unix still written in C
C is used in Micro Computers used in consumer
devices like Microwaves, AC’s, Refrigerators etc.
To learn more advanced language like Java, C is must
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12. Some Definitions
Syntax(form):-The syntax of a language describes
the possible combinations of symbols that form a
correct program.
 IDE:- It is a screen display with pull down menus.
We use menu selections to invoke all the operations
necessary to develop our program. (Integrated
Development Environment)
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13. Compiler:- It is the part of IDE, that translates our
source file into machine language.
Keyword:- Keywords are the words whose meaning
has already been explained to the C compiler
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14. Compilers And Interpreters
Compiler
Converts whole program in equivalent Machine
language in one go
Less time used during compilation
Intermediate file is made
More Running Time
Interpreter
• Converts program line by line
• More time during conversion
• Intermediate file not made
• Less Running Time
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