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Learn Perl from Scratch

Solution Review: Letter Grade to GPA

Understand how to create and manage a Perl subroutine that converts letter grades to GPA. Learn to pass parameters and use conditional if-elsif-else statements to return the correct GPA, reinforcing core Perl subroutine concepts.

We'll cover the following...

Let’s look at the solution first before jumping into the explanation:

Perl
sub gpaPoint{
  $grade = @_[0];
  
    if($grade eq "A+") 
    {return 4;}
    elsif($grade eq "A")
    { return 4;}
    elsif($grade eq "A-")
    {return 3.7;}
    elsif($grade eq "B+")
    { return 3.3;}
    elsif($grade eq "B")
    { return 3;}
    elsif($grade eq "B-")
    { return 2.8;}
    elsif($grade eq "C+")
    { return 2.5;}
    elsif($grade eq "C")
    { return 2;}
    elsif($grade eq "C-")
    { return 1.8;}
    elsif($grade eq "D")
    { return 1.5;}
    elsif($grade eq "F")
    { return 0;}
    else
    {return -1;}
  }
  print gpaPoint("B+"); # change value to check for multiple grades

Explanation

We can get the passed parameter by using @_[0] and by using if elsif else statement, we can compare the passed parameter and return the GPA accordingly.