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School's Out
7:07In this video we'll recap what you've learned by creating a program for messaging a student based on grade level and final grade average.
Fabulous work learning
all about conditionals.
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In this section,
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we covered the many different operators
needed to create descriptive conditionals
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including comparison operators,
negation operators, and logical operators.
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We use those conditionals to create nested
and combine if statements, and we explored
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the use of a switch statement to compare
a single expression to multiple values.
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Let's recap what you've learned
by creating a program for
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messaging a student based on the grade
level and final grade average.
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Let's create a new file named school.php.
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Again start with our php tags and
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we're ready to map out what
we're going to be doing.
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So let's start with comments.
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I'll add these in the teacher's notes so
you don't have to type everything.
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If student's class
average is less than 70%,
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we're going to send a message that says,
dear Alena Holligan,
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we look forward to seeing you at
summer school beginning July 1st.
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If the student's class average
is greater than or equal to 70,
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and the current grade is 9,
the message will read,
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congratulations on completing your
freshman year in High School!
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We'll see you on September 1st for
the start of your sophomore year!
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If the student's class average is
greater than or equal to 70% and
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the current grade is 10,
the message will read,
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congratulations on completing
your sophomore year.
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And if the current grade is 11,
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congratulations on
completing your junior year.
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And finally, if the current grade is 12,
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congratulations you've
graduated high school.
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Don't forget to come back and visit.
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The variables we need
are first name as a string,
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Last name, Also as a string.
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Current grade, As an integer.
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And our final average.
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Also as an integer.
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Then we'll need a variable for
our message body.
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This will be a string as well.
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Let's start with a check to make
sure that we have the values for
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the required variables.
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If not firstName or
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not lastName,
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We want to echo,
Please enter a student name.
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Let's run our script.
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We see, Please enter a student name,
because our firstName and
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lastName variables have an empty
string assigned to them.
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Great, let's add Alena Holligan.
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The next thing we want to do is make sure
that the current grade is between 9 and
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12 for high school students.
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So we'll add, elseif,
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our current grade is less than 9,
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or our current grade is greater than 12.
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This is only for high school students.
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Please enter a grade between 9 and 12.
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Let's run the script again.
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Now we see that we need
a grade between 9 and 12.
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Let's change our current grade 9.
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Next we're ready to show a message for
our students based on grade level and
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final grade average.
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So I'm going to put this next
section within an else block,
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that displays the message.
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Echo "Dear firstName lastName,
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a newline character" and end the line.
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Then we're also going to
echo our messageBody.
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I use double quotes so
the variables are expanded.
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Now we're ready to set our message body.
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Within the else block, we add if
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finalAverage is less than .70,
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Our messageBody is going to
equal our summer message.
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We can copy this from the comments above.
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Else, We're going to display a different
message based on current grade.
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So this is a great place
to use a switch statement.
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Switch, CurrentGrade.
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And then we start with our first case, 9.
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Again, we can copy the message
from our comments above.
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We add our break, and
then we're ready for our next case.
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We can do the same things for
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grades 10 through 12 copying
the text from the comments above.
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There should be no way to finish this
switch statement without the current grade
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equal to something between 9 and 12.
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But just in case, we can add a default.
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Error: Grade Level is not 9-12.
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Let's run our script again.
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We see this summer school message, because
the final average is less than .70.
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Let's change that to .88,
And run the script again.
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This time, we see congratulations
on completing your freshman year.
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Congratulations on completing
this section on conditionals.
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To get comfortable with conditionals,
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try playing around with any of the code
we've written in this section.
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Then join me in the next section and
explore the compound variable type arrays.
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