Programming Languages

A Guide to Working With Visual Logic by Thad Crews

By Thad Crews

A advisor TO operating WITH visible good judgment is helping you and your scholars maximize the visible common sense software program. The ebook basically introduces visible good judgment as an easy, yet robust, instrument for studying programming good judgment and layout with no conventional high-level programming language syntax. visible common sense makes use of flowcharts to give an explanation for crucial programming options, together with variables, enter, task, output, stipulations, loops, methods, photos, arrays, and records.

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WHILE LOOPS CONSOLE INPUT/OUTPUT SUMMARY » Console I/O is persistent, meaning each line of input and output remains in the console window for the lifetime of the program. » In Visual Logic, console input and output options are under the “More >>” button in the » edit dialog, and console I/O is indicated by the presence of the console screen icon at the top of the flowchart element. The end-of-output (§) symbol always appears at the end of the console output expression. The position of the end-of-output symbol determines the starting location for the next console I/O.

May not be copied, scanned, or duplicated, in whole or in part. ” Notice that console input and output are used, creating a record of I/O activity in the console window as shown in Figure 3-7. Figure 3-7 Output from program shown in Figure 3-6 »TIP An infinite loop is what you get if there is no way for the loop to end. For example, if the “Count ϭ Count ϩ 1” statement was removed from Figure 3-6, then the resulting loop would be an infinite loop because the variable Count would always remain its initial value of 1, never becoming Ͼ 5, which is necessary to end the loop.

When control flows to the While loop, the condition is evaluated. If the condition is » True, then control flows out through the True arrow into the body of the loop. At the end of the body of the loop the control flows back to the While loop and the condition is evaluated again. This process repeats until the condition eventually evaluates to False, at which time the control flows out through the False arrow to the statement after the While loop. 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.

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