pascal number to alphabet score convert

1program number_to_alphabet_score;
2
3var
4    score : Integer;
5    alphabet_score : string;
6
7function convert_ke_huruf(score : Integer) : string;
8begin
9   if (score >=80) and (score <=100) then
10      alphabet_score := 'A'
11   else if (score >=77) and (score <80) then
12      alphabet_score := 'A-'
13   else if (score >=75) and (score <77) then
14      alphabet_score := 'B+'
15   else if (score >=70) and (score <75) then
16      alphabet_score := 'B'
17   else if (score >=66) and (score <70) then
18      alphabet_score := 'B-'
19   else if (score >=61) and (score <66) then
20      alphabet_score := 'C+'
21   else if (score >=55) and (score <61) then
22      alphabet_score := 'C'
23   else if (score >=50) and (score <55) then
24      alphabet_score := 'D+'
25   else if (score >=40) and (score <50) then
26      alphabet_score := 'D'
27   else if (score >0) and (score <40) then
28      alphabet_score := 'E'
29end;
30
31begin
32  Write('Your score : ');ReadLn(score);
33  convert_ke_huruf(score);
34  WriteLn('Your score is ', alphabet_score)
35end.