# Unambiguous precise efficient can be measured in

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Unambiguous Precise Efficient Can be measured in terms of Time Space Time tends to be more important Design and Analysis of Algorithm 4
Representation of Algorithms A single algorithm can be represented in many ways: Formulas: F = (9/5)C + 32 Words: Multiply the Celsius by 9/5 and add 32. Flow Charts. Pseudo-code. In each case, the algorithm stays the same; the implementation differs! Design and Analysis of Algorithm 5
Representation of Algorithms (Cont’d) A program is a representation of an algorithm designed for computer applications. Process: Activity of executing a program, or execute the algorithm represented by the program Process: Activity of executing an algorithm. Design and Analysis of Algorithm 6
Expressing Algorithms Expressing Algorithms English description Pseudo-code High-level programming language More precise Design and Analysis of Algorithm 7
Pseudo code Pseudo code is like a programming language but its rules are less stringent. Written as a combination of English and programming constructs Based on selection (if, switch) and iteration (while, repeat) constructs in high-level programming languages Design using these high level primitives Independent of actual programming language Design and Analysis of Algorithm 8
Algorithm Discovery The Two Steps of Program Development: 1. Discover the algorithm. 2. Represent the algorithm as a program. Step 2 is the easy step! Step 1 can be very difficult!

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