This document provides an overview of computer programming and the C programming language. It begins by outlining the objectives and fundamentals of computer programming, including the classical model of computing machines, programming languages, compilers, and operating systems. It then describes the von Neumann architecture, low-level machine programming, higher-level languages like assembly and C, and how programs are compiled and executed. The rest of the document demonstrates basic C programming concepts like variables, input/output, and comments through examples.
this ppt is related to the introductory part of assembly language and will be very useful for beginners of information technology students either at their graduation level or at post graduation level
Low level, High level and Middle level programming languages
,Bug and Debugging ,difference between compiler and interpreter,instructions and program,source code and object code ,language translators
this ppt is related to the introductory part of assembly language and will be very useful for beginners of information technology students either at their graduation level or at post graduation level
Low level, High level and Middle level programming languages
,Bug and Debugging ,difference between compiler and interpreter,instructions and program,source code and object code ,language translators
It's a very simple slide describing what is Assembly Language, Assembler and Assembling Technique, Mnemonics, Why should we use assembly language?, and its limitations.
Lectures available at:
https://www.youtube.com/playlist?list=PL9Rh1XF68iO1Cz_RvF-DJ724ueHa70At6
This slides contains all the basic contents related C programming.
Slide contents:
1. Basic Computer Hardware
2. Learning C Basics
3. Variable, constants
4. Operators
5. Decision making
6. Looping
7. Arrays & Function
8. String
9. Structure and Union
10. C Pointers
11. Files in C
12. Dynamic Memory Allocation
13. Summary
14. Practice Problems
Pros and cons of c as a compiler languageAshok Raj
Computer system is made of hardware and software .The hardware understands instructions in the form of electronic charge or binary language in Software programming. So the programs written in High Level Language are fed into a series of tools and OS components to get the desired machine language.This is known as Language Processing System.
It's a very simple slide describing what is Assembly Language, Assembler and Assembling Technique, Mnemonics, Why should we use assembly language?, and its limitations.
Lectures available at:
https://www.youtube.com/playlist?list=PL9Rh1XF68iO1Cz_RvF-DJ724ueHa70At6
This slides contains all the basic contents related C programming.
Slide contents:
1. Basic Computer Hardware
2. Learning C Basics
3. Variable, constants
4. Operators
5. Decision making
6. Looping
7. Arrays & Function
8. String
9. Structure and Union
10. C Pointers
11. Files in C
12. Dynamic Memory Allocation
13. Summary
14. Practice Problems
Pros and cons of c as a compiler languageAshok Raj
Computer system is made of hardware and software .The hardware understands instructions in the form of electronic charge or binary language in Software programming. So the programs written in High Level Language are fed into a series of tools and OS components to get the desired machine language.This is known as Language Processing System.
Computer programming is the heart of computing education. It is a fundamental skill that all computing students are required to learn. However, programming courses are generally considered among the most difficult course and often have the highest dropout rates. The main concern is what concerns of computing faculty is to improve students’ motivation in getting involved in meaningful programming activities. This requires special skills to teach programming. A teacher training workshop was arranged at Directorate of Staff Development for newly inducted Computer Science teachers. The workshop covers various approaches proposed in literature for teaching computer programming. Some useful guidelines have also been suggested. These are the slides of this workshop.
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Programming Fundamentals and Programming Languages Concepts Translatorsimtiazalijoono
Programming Fundamentals and Programming Languages Concepts
Translators
Types of Translators
Assembler
Compiler
Simple C Program
Basics of C Environment
Executing a C Program
Executing a C Program
DISCLAIMER: This Presentation is made for educational purposes only.
Introduction to Computer Programming, Computer Language, History of Computer Language, Hierarchy of High-Level Languages, Algorithm, Data Types and Arduino
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Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
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2. Learning Objectives
•First course in Computer Science
– No previous knowledge is assumed !
•By the end of the course, students will:
– Understand fundamental concepts of
computer programming/imperative structured
programming languages
– Design algorithms to solve (simple) problems
– Use the C programming language
3. Fundamentals – Chapter outline:
• Classical model for computing machines
• Programming
• Programming languages
• Compiling
• Operating system
Setting the basic
concepts and
terminology …
4. Model of a computing machine
• Computing machine (Computer): “a machine
that stores and manipulates information under
the control of a changeable program that is
stored in its memory.”
– Pocket calculator: not a computer ! Manipulates information, but
is built to do a specific task (no changeable stored program)
• This model is named the “von Neumann architecture” (John von
Neumann – 1945; EDVAC - Electronic Discrete Variable Automatic
Computer – the first stored-program computer)
• Stored-program concept: earlier ideas in theoretical articles of: Alan
Turing (1936), Konrad Zuse (1936)
5. The von Neumann architecture
CPU
Input Device Output Device
ALU CU
Main memory
(RAM)
Secondary
storage
6. The von Neumann architecture
• Central Processing Unit (CPU): the “brain” of the machine.
– CU: Control Unit
– ALU: Arithmetic and Logic Unit
• Carries out all basic operations of the computer
• Examples of basic operation: adding two numbers, testing to see if two
numbers are equal.
• Main memory (called RAM for Random Access Memory): stores
programs and data
– Fast but volatile
• Secondary memory: provides permanent storage
• Human-computer interaction: through input and output devices.
– keyboard, mouse, monitor
– Information from input devices is processed by the CPU and may be
sent to the main or secondary memory. When information needs to be
displayed, the CPU sends it to the output device(s).
7. How it works
• How does a computer execute a program ? (example
programs: a computer game, a word processor, etc)
• the instructions that comprise the program are copied
from the permanent secondary memory into the main
memory
• After the instructions are loaded, the CPU starts
executing the program.
• For each instruction, the instruction is retrieved from
memory, decoded to figure out what it represents, and
the appropriate action carried out. (the fetch- execute
cycle)
• Then the next instruction is fetched, decoded and
executed.
8. Machine level programming
• Example: suppose we want the computer to add
two numbers, and if the preliminary result is less
than 10, then add 10 to the result
• The instructions that the CPU carries out might be :
[INSTR1] Load into ALU the number from mem location 15
[INSTR2] Load into ALU the number from mem location 7
[INSTR3] Add the two numbers in the ALU
[INSTR4] If result is bigger than 10 jump to [INSTR6]
[INSTR5] Add 10 to the number in the ALU
[INSTR6] Store the result from ALU into mem location 3
• The processors instruction set: all basic operations that
can be carried out by a certain type of processor
9. Machine level programming
• the instructions and operands are represented in binary notation
(sequences of 0s and 1s).
– Why binary ? Because computer hardware relies on electric/electronic
circuits that have/can switch between 2 states
– bit (binary digit)
– Byte: 8 bits
• The program carried out by the CPU, on a hypothetical processor
type, could be:
1010 1111
1011 0111
0111
…
• This way had to be programmed the first computers !
• The job of the first programmers was to code directly in machine
language and to enter their programs using switches
10. Example: old computer frontpanel
LEDS display the current
memory address and
contents of current memory
location or registers
SWITCHES allow programmer to
enter binary data / instructions
11. Higher level languages
• Assembly language
– First step from machine language
– Uses symbolic names for operations
– Example: a hypothetical assembly language program
sequence:
1010 1111 LD1 15
1011 0111 LD2 7
0111 ADD
0011 1010 CMP 10
0010 1100 JGE 12
0110 1010 ADD 10
… …
12. • Assembly language (cont)
– Translation of assembly language into machine
language: in the beginning done manually, later done
by a special computer program – the assembler
– Disadvantages: Low-level language:
• programmer must learn the instruction set of the particular
processor
• Program must be rewritten in order to run on a different
processor type – program is not portable
13. Higher level languages
• High level languages
– Using more abstract instructions
– Portable programs result
– Example: a hypothetical program sequence:
DEFVAR a,b,c;
BEGIN
READ a
READ b
READ c
c := a+b
IF (c <10) THEN c:=c+10
PRINT c
END …
14. • High level languages
– Writing portable programs, using more abstract
instructions
– A high level instruction (statement) is translated into
many machine instructions
– Translation of high level language into machine
instructions: done by special computer programs –
compilers or interpreters
15. Compilers/Interpreters
Compiler
Source
Code
Machine
Code
Executable
Program
Input
data
Output
data
Interpreter
Source
Code
Input
data
Output
data
Compiler: analyzes program and
translates it into machine language
Executable program: can be run
independently from compiler as
many times => fast execution
Interpreter: analyzes and executes
program statements at the same
time
Execution is slower
Easier to debug program
16. Operating Systems
• Operating system: a program that controls the
entire operation of a computer system:
– Handles all input and output (I/O) operations that are
performed on a computer
– manages the computer system’s resources
– handles the execution of programs (including
multitasking or multiuser facilities)
• Most famous OS families:
– Windows
– Unix
17. Higher Level Languages
• Programming Paradigms:
– Imperative Programming: describes the exact
sequences of commands to be executed
• Structured programming, procedural programming
– FORTRAN, C, PASCAL, …
• Object oriented programming
– C++, Java, C#, …
– Declarative programming: program describes what it
should do, not how
• Functional programming
– Lisp, ML, …
• Logic Programming
– Prolog
18. The C Programming Language
• Developed by Dennis Ritchie at AT&T Bell Laboratories
in the early 1970s
• Growth of C tightly coupled with growth of Unix: Unix
was written mostly in C
• Success of PCs: need of porting C on MS-DOS
• Many providers of C compilers for many different
platforms => need for standardization of the C language
• 1990: ANSI C (American National Standards Institute)
• International Standard Organization: ISO/IEC 9899:1990
• 1999: standard updated: C99, or ISO/IEC 9899:1999
19. The first C program
#include <stdio.h>
int main (void)
{
printf ("Programming is fun.n");
return 0;
}
uses standard library
input and output functions
(printf)
the program
begin of program
statements
end of program
main: a special name that indicates where the program must begin execution. It is
a special function.
first statement: calls a routine named printf, with argument the string of characters
“Programming is fun n”
last statement: finishes execution of main and returns to the system a status value
of 0 (conventional value for OK)
20. The format in C
• Statements are terminated with semicolons
• Indentation is nice to be used for increased readability.
• Free format: white spaces and indentation is ignored by
compiler
• C is case sensitive – pay attention to lower and upper
case letters when typing !
– All C keywords and standard functions are lower case
– Typing INT, Int, etc instead of int is a compiler error
• Strings are placed in double quotes
• New line is represented by n (Escape sequence)
21. Compiling and running C programs
Editor
Compiler
Linker
Source code
file.c
Object code
file.obj
Executable code
file.exe
Libraries
IDE (Integrated
Development
Environment)
22. C Compilers and IDE’s
• One can:
– use a text editor to edit source code, and then use independent
command-line compilers and linkers
– use an IDE: everything together + facilities to debug, develop
and organize large projects
• There are several C compilers and IDE’s that support
various C compilers
• Lab: Dev-C++ IDE for C and C++, Free Software (under
the GNU General Public License)
– Works with gcc (GNU C Compiler)
• supports the C99 standard
• available on Windows and Unix
– The GNU Project (http://www.gnu.org/): launched in 1984 in
order to develop a complete Unix-like operating system which is
free software - the GNU system.
24. Syntax and Semantics
• Syntax errors: violation of programming
language rules (grammar)
– "Me speak English good."
– Use valid C symbols in wrong places
– Detected by the compiler
• Semantics errors: errors in meaning:
– "This sentence is excellent Italian."
– Programs are syntactically correct but don’t produce
the expected output
– User observes output of running program
25. Second program
#include <stdio.h>
int main (void)
{
printf ("Programming is fun.n");
printf ("And programming in C is even more fun.n");
return 0;
}
26. Displaying multiple lines of text
#include <stdio.h>
int main (void)
{
printf ("Testing...n..1n...2n....3n");
return 0;
}
Output:
Testing...
..1
...2
....3
It is not necessary
to make a separate
call to printf for each
line of output !
27. Variables
• Programs can use symbolic names for
storing computation data and results
• Variable: a symbolic name for a memory
location
– programmer doesn’t has to worry about
specifying (or even knowing) the value of the
location’s address
• In C, variables have to be declared before
they are used
28. Using and Displaying Variables
#include <stdio.h>
int main (void)
{
int sum;
sum = 50 + 25;
printf ("The sum of 50 and 25 is %in", sum);
return 0;
}
Variable sum declared of type int
Variable sum assigned expression 50+25
Value of variable sum is printed in place of %i
The printf routine call has now 2 arguments: first argument a string containing also a
format specifier (%i), that holds place for an integer value to be inserted here
29. Displaying multiple values
#include <stdio.h>
int main (void)
{
int value1, value2, sum;
value1 = 50;
value2 = 25;
sum = value1 + value2;
printf ("The sum of %i and %i is %in",value1, value2, sum);
return 0;
}
The format string must contain as many placeholders as expressions to be printed
30. Using comments in a program
• Comment statements are used in a program to
document it and to enhance its readability.
• Useful for human readers of the program – compiler
ignores comments
• Ways to insert comments in C:
– When comments span several lines: start marked with /*, end
marked with */
– Comments at the end of a line: start marked with //
31. Using comments in a program
/* This program adds two integer values
and displays the results */
#include <stdio.h>
int main (void)
{
// Declare variables
int value1, value2, sum;
// Assign values and calculate their sum
value1 = 50;
value2 = 25;
sum = value1 + value2;
// Display the result
printf ("The sum of %i and %i is %in",
value1, value2, sum);
return 0;
}