assign-marks.taq

$ java -jar taq.jar assign-marks

Running query marks in global scope 
score(student=George, english=b+, maths=b-, history=a-)
score(student=Sarah, english=c+, maths=a, history=b+)
score(student=Amy, english=b, maths=a-, history=e+)

Description

assign-marks.taq shows a list being created with 18 items and has an index range of 1 to 18 instead of 0 to 17. The list is also initialized in reverse as it is intuitive that alpha grades appear in descending order.

The list is declared specifying the custom range

list<string> mark[1,18] = reverse ( “a+”,“a”,“a-” … “f+”,“f”,“f-” }

Another detail of interest is how the values of untyped variables “english”, “maths” and “history” change when the “score” template is evaluated.

english = mark[english], maths = mark[maths], history = mark[history]

These variables are initially set to integer scores by unification, but each is assigned a text alpha grade to resolve the query.