you can also watch my video lecture the link is-https://www.youtube.com/watch?v=xoJtdSHdIFc

1. Welcome to lecture
2………………
-email me at:umairnsr87@gmail.com
-for further queries contact:09045562429

2. Lecture 2 contents ……….
 Block diagram of computer
 Primary memory and secondary memory
 Input and output unit
 Algorithms
 Flow chart
 Structured programming

3. Block diagram……….

4. Primary and secondary memory…..
 Primary memory stands for RAM (random access
memory) it is a volatile memory, it is fast as
compared to secondary memory, it is expensive as
compared to secondary memory, it has a low
storage capacity.
 Secondary memory is the memory which holds the
data permanently until it is deleted or removed it is
non-volatile memory, it has a high storage capacity,
it is also cheap as compared to RAM.

5. Input and output unit……………
 Input devices are the devices which are used
to give instructions to the computer.
Examples-keyboard, mouse, scanner,
barcode reader etc.
 Output devices are the devices which are
used to show the output when any input is
given by the input devices. Examples-monitor
,projector etc

6. Algorithms……………………..
 The algorithm is a method or technique of
solving a problem which can be later
implemented in any programming language.

7. Algorithm for making tea………

8. Flow chart………….
 Flow chart is a graphical method which is
used to show the flow of control in the
program while the execution is been occuring

9. Symbols in a flow chart……..

10. Structured programming……..
 Structured programming is a technique of
writing the program in modules which makes
the task simplier.
 The program must perform all the operations,
must be reliable, must be easy i.e. it can be
read or write easily, it should be implemented
in a budget or schedule.

11. To be continued in lecture 2……….
-email me at:umairnsr87@gmail.com
-for further queries contact:09045562429