1. Computer Electronic device Accepts data - input
Processes it according to a given set of instructions
Produces results - output
input
output
Computer

2. Input, Output, Computer Program
Input – unprocessed data manipulated by the computer
Output – processed information or results produced by the computer
The set of instructions
that the computer follows
is called a computer program

3. Computer System hardware the physical equipment used to process a data
software
computer programs

4. Hardware
CPU
010
111
.....
Main
Memory
Secondary
I/O Devices

5. Hardware
Main
Memory
Input
Devices
Output
Devices
CPU

6. Input/Output Devices Input devices keyboard, mouse
enter data and programs into
the computer
Output devices
printer, monitor
display the results processed
by the computer

7. Memory Bit - Binary Digit Byte = 8 bits
Main Memory
Nonpermanent
Rapid Access
Low Capacity
Secondary Storage
Permanent
Non Rapid
High Capacity
Bit - Binary Digit
Byte = 8 bits
KB = KiloBytes = 1024 bytes =210
MB = MegaBytes = 1,048,576 bytes = 220
GB = GigaBytes = 230 bytes

8. CPU – Central Processing Unit
Control Unit
Directs the processing operations
Coordinates the flow of data to Main Memory and ALU
Arithmetic Logic Unit (ALU)
performs
Arithmetic operations
Logic operations

9. Software Operation Systems Application Software DOS UNIX Windows Word
Power Point
Emacs

10. The First Program /*Author: Yana Date: 10/09/2004
Prints the text ‘Hello World!’ */
#include <stdio.h>
int main(){
printf( “Hello World!\n” );
return 0; }

11. Compilation Process
High Level Language
Compiler
Machine Language

12. Compilation Process Executable File 010111001011101110….. Source File
Compiler
int main(){
printf(….); }
Object File
Object File/Library ….
010100….
Linker
Executable File
…..