COMP 102 Programming Fundamentals I

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COMP 102Programming Fundamentals I

• Presented by Timture Choi

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Software Development Process

• Requirement analysis
• Specifications
• Design and architecture
• Coding
• Testing
• Documentation
• Maintenance

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Arithmetic Operators

• -
• /
• Note Precision problem
• int/int -gt int
• Truncates instead of round-off
• E.g. 3 / 2 gt 1
• (modulus/remainder)
• E.g. 10 3 gt 1

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Operator Precedence

• Evaluation order of operators
• ( )
• , /
• , -
• Left associativity
• Evaluate from left to right if same precedence
• E.g.
• (1 2) 3 4 / 5
• 1 2 gt 3
• 3 3 gt 9
• 4 / 5 gt 0.8
• 9 0.8 gt 6.2

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Assignment Statement

• Syntax
• ltidentifiergt ltexpressiongt
• E.g.
• a_var (1 2) 3 4 / 5

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Assignment Conversions

• Implicit
• E.g.
• float z 2.7
• int y 3
• y z // y will be set to 2
• Explicit
• Syntax
• var_1 type (var_2)
• var type (expression)
• E.g.
• int x 1, y 2
• double z
• z double (x)/double (y) // z will be set to 0.5

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Standard I/O

• Include the iostream
• Input
• cin gtgt
• Output
• cout ltlt
• Special output characters
• \a
• \t
• \n
• \\

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Structured Programming

• Subset of procedural programming
• Based upon the concept of procedure call
• Procedure/routine/subroutines/method/function
• Removing or reducing reliance on the GOTO
  statement
• Often associated with top-down design approach
• An overview of the system is formulated
• Each part of the system is then refined by
  designing it in more detail
• Each new part may then be refined again
• Until the entire specification is detailed enough
  to validate the Model

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SUMMARY

• By the end of this lab, you should be able to
• Use arithmetic operators
• Evaluate expression with standard operator
  precedence order
• Write assignment
• Identify rules of division
• Apply assignment conversions
• Employ standard I/O functions
• cin/cout