powershell function that prints letter grade with a range [closed] - powershell

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so far i got this need help writing this function:
if (grades$Final[i] >=90) {
"A"
}
else if (grades$Final[i] >=80){
"B"
}
else if(grades$Final[i] >=70){
"C"
}
else if(grades$Final[i] >=60){
"D"
}
else {"F"}
}
}

Answer 1

Hello in this case i would suggest using a switch instead of a bunch of If statements
In powershell we use -lt (less than) -gt (Greater than) -eq (Equal) -ge (Greater or equal) -le (Less than or equal)
I noticed you are using [i] to call the index in an array i assume.
In powershell you can pipe |. So You can take an array and pipe it to a function. You can create an array using #().
#("Hello","World") | Foreach-object{
"$_ TEST"
}
Output
Hello TEST
World TEST
So i bet you are wondering what $_ is. Well When you pipe its the object that was piped so as in the example above since the array had 2 entries the first loop it equaled Hello and the second time it equaled World
So here is a function to get Int to Grade Letters. As you can see at bottom piping Ints into the function
function Get-LetterGrade(){
param(
[Parameter(Position=1, ValueFromPipeline=$true)]
[int]$Grade
)
process{
switch($Grade){
{$_ -ge 90} { "A" }
{$_ -ge 80 -and $_ -lt 90} { "B" }
{$_ -ge 70 -and $_ -lt 80} { "C" }
{$_ -ge 60 -and $_ -lt 70} { "D" }
{$_ -lt 60} { "F" }
}
}
}
90,80,70,60,50 | Get-LetterGrade
Output would be
A
B
C
D
F

Answer 2

In Powershell numeric comparison operators are a little different...
is -gt
< is -lt
= is -ge
There is a ton (...ton) of documentation on comparison operators in Powershell, which you can get via Google.
"else if" would be "elseif". Your variable name is a little weird. In Powershell, we start variable names with a dollar sign, "$". It sort of looks like you have an array named "grades$Final". It's confusing. Stick to conventions on variable names; descriptive and adhering to naming rules.
If I had to re-write your logic, I'd use something like...
$grades = #(12, 78, 83, 92)
foreach ($grade in $grades) {
if ($grade -ge 90) {
write-output 'A'
} elseif ($grade -lt 90 -and $grade -ge 80) {
write-output 'B'
} elseif ($grade -lt 80 -and $grade -ge 70) {
write-output 'C'
} elseif ($grade -lt 70 -and $grade -ge 60) {
write-output 'D'
} elseif ($grade -lt 60) {
write-output 'F'
}
}