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For a program to compute the desired result it
must proceed through a series of logical steps, transforming the inputs
into outputs. Figuring out what those logical steps should be is the task
of the programmer. |
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Projects are multipart tasks that span a couple
of weeks in which a significant computation is developed. |
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Sign Finder accepts the day and month of a
person’s birth and returns the person’s Zodiac sign |
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In formulating the logic of the computation,
specify the inputs and outputs first |
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Input: A month and a day |
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Output: The name of the Zodiac sign |
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The radio buttons and the text box of the GUI
are the means of presenting input |
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The computation takes place when the OK is
clicked |
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Since clicking a radio button, entering the text
box and clicking the OK command button are “events”, the program can be
developed by considering what computation is needed in response to each
event |
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Month Radio Button -- set up the data for that
month |
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Day Value Entry -- save the data for later |
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OK Command Button -- Determine the sign and
print it |
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How is the sign determined from the month and
day? |
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Notice that a person born in a given month could
have one of two signs, depending on the day of birth |
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A July birthday |
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could be either |
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Cancer or Leo |
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Every month is |
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similar: There |
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are two signs |
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possible |
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When a month is chosen, remember the two signs
that apply and the day when they change … when the birth day is chosen it
is possible to pick the sign |
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The day is simply a number that is typed in |
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It should be saved in a variable for later use |
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With the month chosen and the day chosen, it is
possible to figure out the sign |
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If the day is on the midpt or before, it’s the
earlier sign |
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If the day is after the midpt, it’s the later
sign |
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The following steps achieve the result |
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Create the GUI |
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Declare the four variables |
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loSign, a string |
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hiSign, a string |
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midpt, an integer |
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dayPick, an integer |
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Set loSign, hiSign and midpt in radio buttons |
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Set dayPick to the text input |
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For the OK click event, incorporate the
If-statement and set the visibility of the two labels |
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Notes