Similarly the statements within each ifthen structure

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Unformatted text preview: ode is not equal to Z, that is, as long as the trailer record is not fond. In this example, a series of decisions followed by an instruction to read next student's record are included within the loop. The first statement within the DO.. .WHILE loop asks, "Is the Sexcode equal to F?" If the answer is yes, Pergentage is calculated and again the third statement within the loop asks, "Is Percentage equal to or greater than 45?" If it is, then "Is Percentage less than 60?" This is a series of three IF...THEN decision structures. Each one ends with an ENDIF vertically aligned below the appropriate IF. The two instructions - "Write output data" and "Add 1 to Count" are performed only if all the three conditions (that of Sexcode being F, Percentage being equal to or more than 45, and Percentage being less than 60) are found to be true (answered yes). If any of the three conditions is not true, the logic path goes to the statement that reads the next student's record. After the last student's record is processed, the trailer record for which the value of Sexcode is Z is encountered. This will cause the DO...WHILE loop to stop, because the condition (Sexcode not equal to Z) is no longer true. When the DO.. .WHILE condition is no longer true, the next logical step will be the instruction following the ENDDO. At this stage, the value of Count will be printed (Write Count) and finally the program execution will stop (Stop). Set Count to zero Read first student record DO WHILE Sexcode is not equal to Z IF Sexcode = F THEN Calculate Percentage IF Percentage = > 45 THEN IF Percentage < 60 THEN Write output data Add 1 to Count ENDIF ENDIF ENDIF Read next student record ENDDO Write Count Stop One important feature of pseudocode as a programming tool is the use of indentation. Each statement within the DO...WHILE loop is indented, to show that it is part of the loop. Similarly, the statements within each IF...THEN structure is indented properly to clearly specify the statements, which are part of each structure. The use of...
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This document was uploaded on 04/07/2014.

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