Polya’s 4-step Process 1.Understand the problem 2.Devise a plan 3.Carry out the plan 4.Look back, review results.

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Presentation transcript:

Polya’s 4-step Process 1.Understand the problem 2.Devise a plan 3.Carry out the plan 4.Look back, review results

Program Development Cycle 1.Analyze the problem 2.Design the program 3.Code the program 4.Test the program

A tempting shortcut? GOAL THINKING CODE REVISE DEBUG TEST CODE Shortcut?

Sequence

Selection NY

Loops (Iteration) N Y

Fibonacci Example SEQUENCE … QUESTION What is the value of the first term greater than 1000?

Fibonacci Example Is SUM <= 1000 No Yes NEXT  LAST LAST  SUM PRINT SUM SUM  LAST + NEXT LAST  1 NEXT  0

Fibonacci Example

Hardware / Software

A Simple Computer System Control Unit Arithmetic Unit Memory inputoutput Flow of instructions Flow of data Flow of control