Phases of Software Development and Programming Languages, Slides of Fundamentals of E-Commerce

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Programming

Lecture Objectives

Phases in

Software Development Cycle

• Phase

:^

Program Specifications

• Phase2: Program Design (

Documentation Techniques

• Psuedo code• Flow charting
  • Phase 3

: Program Coding

• Phase 4

: Program Testing

• Phase 5

: Installing the Program

• Phase 6

: Program Documentation

• Phase 7

: Program Maintenance

… 3. Program Code

• ….Main types of Computer Languages

• High Level (

Symbolic Languages

• Uses

English like syntax

• Commonly used

on different hardware platforms

• Much easier to use

than machine languages

• Simple

symbolic

names can be used for

Memory

addresses

• Needs a translator program (compiler

) to generate

the equivalent machine code

• Examples

: Quick BASIC, C++, Java

LET TOTAL = AMT1 + AMT2 A program instruction in Quick Basic

….2- Example ( Advantage Advertising)

C++ Code for

“Compute time for Client A”

4. Program Test (Debugging)

Process of removing bugs (errors) from a program

Possible error types

Syntax Errors

(Coding Errors)

• Coding incorrectly • Causes

: Typing mistakes/ violating language rules

• Example:
  • PRNT “Hello”

‘A syntax error in PRINT statement of Quick

Basic

• printf(“%s: %d”,”Result”,x)

‘In C++, statement does not end

with a semicolon (;)

…4. Program Test (Debugging)

….Possible error types

Logic Errors

(Algorithm Errors)

• Mistakes in algorithm steps • Results in
  • incorrect outputs– Run-time crashes
    • Causes

:

• Mistakes in the instruction sequence– Using inappropriate instructions
  • Not very obvious when

happening with some particular values

of data inputs