Lecture1 Agorithms and flowcharts - EEMQ 1224 ALGORITHMS AND FLOWCHARTS A typical programming task can be divided into two phases Problem solving phase

Lecture1 Agorithms and flowcharts - EEMQ 1224 ALGORITHMS...

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EEMQ 1224 5/18/2016 1 ALGORITHMS AND FLOWCHARTS EEMQ 1224 1 ALGORITHMS AND FLOWCHARTS A typical programming task can be divided into two phases: Problem solving phase produce an ordered sequence of steps that describe solution of problem this sequence of steps is called an algorithm Implementation phase Implement the program in some programming language EEMQ 1224 2 Steps in Problem Solving First produce a general algorithm (one can use pseudocode ) Refine the algorithm successively to get step by step detailed algorithm that is very close to a computer language. EEMQ 1224 3 Pseudocode & Algorithm Example 1: Write an algorithm to determine a student’s final grade and indicate whether it is passing or failing. The final grade is calculated as the average of four marks. EEMQ 1224 4 Pseudocode & Algorithm Pseudocode : Input a set of 4 marks Calculate their average by summing and dividing by 4 if average is below 50 Print “FAIL” else Print “PASS” EEMQ 1224 5 Pseudocode & Algorithm Detailed Algorithm Step 1: Input M1,M2,M3,M4 Step 2: GRADE (M1+M2+M3+M4)/4 Step 3: if (GRADE < 50) then Print “FAIL” else Print “PASS” endif EEMQ 1224 6
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EEMQ 1224 5/18/2016 2 The Flowchart (Dictionary) A schematic representation of a sequence of operations, as in a manufacturing process or computer program. (Technical) A graphical representation of the sequence of operations in an information system or program. Information system flowcharts show how data flows from source documents through the computer to final distribution to users.
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