A Guide to Working With Visual Logic by Thad Crews

By Thad Crews

A consultant TO operating WITH visible good judgment is helping you and your scholars maximize the visible common sense software program. The e-book basically introduces visible common sense as an easy, yet robust, software for learning programming common sense and layout with no conventional high-level programming language syntax. visible common sense makes use of flowcharts to give an explanation for crucial programming recommendations, together with variables, enter, task, output, stipulations, loops, systems, pics, arrays, and documents.

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When using the pre-test version of the While loop, the condition is tested first, and the loop body only executes if the initial test is true. When using the post-test version of the While loop, the loop body executes before the condition is tested; thus, the loop always executes at least one time. Both loops terminate when the condition evaluates to False. 45 Copyright 2009 Cengage Learning, Inc. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WHILE LOOPS WHILE LOOPS AND SENTINEL VALUES There are many instances where you want to use a loop but you do not know how many times a loop will repeat.

Identify possible uses of decision statements (IF statements) for a video store’s rental checkout system. 3. The long-distance billing problem has a nested IF solution (Figure 2-4). This solution was rewritten as a compound condition solution (Figure 2-5). Can all nested IF solutions be rewritten as compound condition solutions? As part of your answer, consider the problem of inputting two values and displaying if the first is smaller than, equal to, or greater than the second (Figure 2-3). If it can be rewritten, include the new solution with your answer.

47 Copyright 2009 Cengage Learning, Inc. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WHILE LOOPS Begin Count = 0 Sum = 0 Input: Number Number <> –1 True False Count = Count + 1 Sum = Sum + Number Input: Number Output: “Count is ” & Count “Sum is ” & Sum “Average is ” & (Sum/ Count)§ End Figure 3-15 Sentinel value used to calculate the average »TIP Figure 3-15 includes the statements Count=0 and Sum=0 before those variables are used for counting and accumulation.

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