Download Lecture1 - University of Houston

CSCI 3133
Programming with C
Instructor: Bindra Shrestha
University of Houston – Clear Lake
Computer Software
1. System Software
Operating System
2. Application Software
•General-purpose software-word
processors, database management systems
• Application Specific Software-ledger
system used by accountants
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Computing Environments
1. Personal Computing Environment
A Personal Computer
2. Time-Sharing Environment
Many users are connected to one or
more computers in shared environment.
3. Client/Server Environment
Splits the computing function between a
central computers and users’ computers
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Computer Languages
Machine Language -1940s
• streams of 0s and 1s. Program 1-1 pg.7
•Grace Hopper developed symbolic language
in1950s which mirrored the machine language, uses
symbols
•As assembler translates symbolic language into a
machine language, they soon became Assembly
Language. Program 1-2 pg 8.
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Computer Languages
High -Level Languages-1960s
• must be converted to machine language,
the process is known as compilation
•FORTRAN,COBAL,C
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Building a C Program
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Building a C Program
1. Writing and Editing Programs
2. Compiling the Program
3. Linking the program with library
modules
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Program Development
1. Understand the problem
2. Develop a solution
3. Write the program
4. Test the program
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Tools to develop the solution
1. Structure Chart -shows how a
problem can be broken into logical steps.
figure 1-12, pg 15
2. Pseudocode -steps to accomplish the
task in English-like statements
3. Flowchart-steps to accomplish the
task in graphical symbols
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Flowchart Symbols
Oval : Denotes begin or End
Flow line(arrow): direction of logical flow
Parallelogram: denotes input/output
operation
Rectangle: denotes a process
Diamond: denotes a decision point
(if/then/else)
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Example
Calculate the Area of a Rectangle
1. Prompt the user for length and
width
2. Store length and width
3. Set Area=length*width
4. Return Area
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Example of Flowchart
Begin
.
Prompt user length
and width
Read length,width
Area = length*width
X
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Flowchart contd.
.
X
Display area
to user
End
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