Pascal record has no value
Question
Why the namax , namin , and in rerata_akhir function return 0 instead of maximum, minimum, and the average of dtmhs[i].akhir value? What's wrong with my code?
This is my code:
program data_nilai_mhs;
uses crt;
type mhs = record
nama,nim,tgl:string;
tugas,prak,uas,uts:integer;
akhir:real;
end;
var dtmhs:array [1..35] of mhs;
i,a,uts_max,uas_max,uts_min,uas_min :integer;
akhir_min,akhir_max:Real;
grade:string;
pilih:integer;
procedure input;
begin
clrscr;
writeln(' ');
writeln(' MASUKKAN DATA NILAI MAHASISWA ');
writeln(' ----------------------------- ');
write (' Jumlah Mahasiswa : '); readln(a);
writeln;
for i:=1 to a do
begin
with dtmhs[i] do
begin
writeln(' Data Ke-',i);
writeln(' ----------- ');
write (' Nama : '); readln (dtmhs[i].nama);
write (' NIM : '); readln (dtmhs[i].nim);
write (' Tugas : '); readln (dtmhs[i].tugas);
write (' UTS : '); readln (dtmhs[i].uts);
write (' UAS : '); readln (dtmhs[i].uas);
write (' Praktikum : '); readln (dtmhs[i].prak);
writeln;
readln;
end;
end;
end;
procedure tabel;
begin
writeln(' ');
writeln('|===============================================================================================================|');
writeln('| DATA NILAI MAHASISWA |');
writeln('|===============================================================================================================|');
writeln('|NO.| NAMA MAHASISWA | NIM | TUGAS | UTS | UAS | PRAK | NA | GRADE |');
writeln('|---------------------------------------------------------------------------------------------------------------|');
for i:=1 to a do
begin
gotoxy(1,i+6);
writeln('| | | | | | | | | |');
writeln('|===============================================================================================================|');
end;
end;
// Fungsi Maksimum
function utsmax(): Integer;
var
max:Integer;
begin
max:=1;
for i := 2 to a do
begin
if (dtmhs[i].uts > dtmhs[max].uts) then max := i;
end;
utsmax:=dtmhs[max].uts;
end;
function uasmax(): Integer;
var
max:Integer;
begin
max:=1;
for i := 2 to a do
begin
if (dtmhs[i].uas > dtmhs[max].uas) then max := i;
end;
uasmax:=dtmhs[max].uas;
end;
function tugasmax(): Integer;
var
max:Integer;
begin
max:=1;
for i := 2 to a do
begin
if (dtmhs[i].tugas > dtmhs[max].tugas) then max := i;
end;
tugasmax:=dtmhs[max].tugas;
end;
function prakmax(): Integer;
var
max:Integer;
begin
max:=1;
for i := 2 to a do
begin
if (dtmhs[i].prak > dtmhs[max].prak) then max := i;
end;
prakmax:=dtmhs[max].prak;
end;
function namax(): Real;
var
max:Integer;
begin
max:=1;
for i := 2 to a do
begin
if (dtmhs[i].akhir > dtmhs[max].akhir) then max := i;
end;
namax:=dtmhs[max].akhir;
end;
// Fungsi minimum
function utsmin(): Integer;
var
min:Integer;
begin
min:=1;
for i := 2 to a do
begin
if (dtmhs[i].uts < dtmhs[min].uts) then min := i;
end;
utsmin:=dtmhs[min].uts;
end;
function uasmin(): Integer;
var
min:Integer;
begin
min:=1;
for i := 2 to a do
begin
if (dtmhs[i].uas < dtmhs[min].uas) then min := i;
end;
uasmin:=dtmhs[min].uas;
end;
function tugasmin(): Integer;
var
min:Integer;
begin
min:=1;
for i := 2 to a do
begin
if (dtmhs[i].tugas < dtmhs[min].tugas) then min := i;
end;
tugasmin:=dtmhs[min].tugas;
end;
function prakmin(): Integer;
var
min:Integer;
begin
min:=1;
for i := 2 to a do
begin
if (dtmhs[i].prak < dtmhs[min].prak) then min := i;
end;
prakmin:=dtmhs[min].prak;
end;
function namin(): Real;
var
min:Integer;
begin
min:=1;
for i := 2 to a do
begin
if (dtmhs[i].akhir < dtmhs[min].akhir) then min := i;
end;
namin:=dtmhs[min].akhir;
end;
function maksimum(): Integer;
var
chose: Char;
begin
clrscr;
writeln('a. Nilai UTS ');
writeln('b. Nilai UAS ');
writeln('c. Nilai Tugas ');
writeln('d. Nilai Praktikum');
writeln('e. Nilai Akhir ');
write ('Masukkan Pilihan [a/b/c/d/e] ? : ');readln(chose);
case chose of
'a': writeln('Nilai terbesar UTS adalah ',utsmax());
'b': writeln('Nilai terbesar UAS adalah ',uasmax());
'c': writeln('Nilai terbesar Tugas adalah ',tugasmax());
'd': writeln('Nilai terbesar Praktikum adalah ',prakmax());
'e': writeln('Nilai terbesar NA adalah ',namax():0:2);
end;
end;
function minimum(): Integer;
var
chose: Char;
begin
clrscr;
writeln('a. Nilai UTS ');
writeln('b. Nilai UAS ');
writeln('c. Nilai Tugas ');
writeln('d. Nilai Praktikum');
writeln('e. Nilai Akhir ');
write ('Masukkan Pilihan [a/b/c/d/e] ? : ');readln(chose);
case chose of
'a': writeln('Nilai terbesar UTS adalah ',utsmin());
'b': writeln('Nilai terbesar UAS adalah ',uasmin());
'c': writeln('Nilai terbesar Tugas adalah ',tugasmin());
'd': writeln('Nilai terbesar Praktikum adalah ',prakmin());
'e': writeln('Nilai terbesar NA adalah ',namin():0:2);
end;
end;
function rerata_uts():real;
var
temp:real;
begin
temp:=0;
for i:=1 to a do begin
temp:=temp+dtmhs[i].uts;
end;
rerata_uts:=temp/a;
end;
function rerata_uas():real;
var
temp:real;
begin
temp:=0;
for i:=1 to a do begin
temp:=temp+dtmhs[i].uas;
end;
rerata_uas:=temp/a;
end;
function rerata_tugas():real;
var
temp:real;
begin
temp:=0;
for i:=1 to a do begin
temp:=temp+dtmhs[i].tugas;
end;
rerata_tugas:=temp/a;
end;
function rerata_prak():real;
var
temp:real;
begin
temp:=0;
for i:=1 to a do begin
temp:=temp+dtmhs[i].prak;
end;
rerata_prak:=temp/a;
end;
function rerata_akhir():real;
var
temp:real;
begin
temp:=0;
for i:=1 to a do begin
temp:=temp+dtmhs[i].akhir;
end;
rerata_akhir:=temp/a;
end;
function rerata_semua(): real;
var
chose: Char;
begin
clrscr;
writeln('a. Rata-rata UTS ');
writeln('b. Rata-rata UAS ');
writeln('c. Rata-rata Tugas ');
writeln('d. Rata-rata Praktikum');
writeln('e. Rata-rata Akhir ');
write ('Masukkan Pilihan [a/b/c/d/e] ? : ');readln(chose);
case chose of
'a': writeln('Nilai rata-rata UTS adalah ',rerata_uts():0:2);
'b': writeln('Nilai rata-rata UAS adalah ',rerata_uas():0:2);
'c': writeln('Nilai rata-rata Tugas adalah ',rerata_tugas():0:2);
'd': writeln('Nilai rata-rata Praktikum adalah ',rerata_prak():0:2);
'e': writeln('Nilai rata-rata NA adalah ',rerata_akhir():0:2);
end;
end;
procedure output;
var
chose: Integer;
begin
clrscr;
tabel;
for i:=1 to a do
begin
dtmhs[i].akhir := (0.1*dtmhs[i].tugas) + (0.3*dtmhs[i].uts) + (0.3*dtmhs[i].uas) + (0.3*dtmhs[i].prak);
with dtmhs[i] do
begin
if (akhir>=0) and (akhir < 20) then grade:='E' else
if (akhir>=20) and (akhir < 40) then grade:='D' else
if (akhir>=40) and (akhir < 60) then grade:='C' else
if (akhir>=60) and (akhir < 80) then grade:='B' else
grade:='A' ;
end;
end;
for i:=1 to a do
begin
with dtmhs[i] do
begin
gotoxy(3,i+6); writeln(i);
gotoxy(9,i+6); writeln(nama);
gotoxy(26,i+6);writeln(nim);
gotoxy(43,i+6);writeln(tugas);
gotoxy(56,i+6);writeln(uts);
gotoxy(69,i+6);writeln(uas);
gotoxy(82,i+6);writeln(prak);
gotoxy(95,i+6);writeln(akhir:0:2);
gotoxy(108,i+6);writeln(grade);
end;
end;
readln;
end;
begin
// repeat
clrscr;
writeln('| SELAMAT DATANG DI PROGRAM ENTRI MAHASISWA |');
writeln('|===================================================|');
writeln('| |');
writeln('| 1. Input Data Mahasiswa |');
writeln('| 2. Tampilan Data Mahasiswa |');
writeln('| 3. Nilai Alpro Terbesar |');
writeln('| 4. Nilai Alpro Terkecil |');
writeln('| 5. Rata-rata Nilai Alpro |');
writeln('| 6. Keluar |');
writeln('|===================================================|');
writeln(' ');
write ('Masukkan Pilihan [1/2/3/4/5/6] ? : ');readln(pilih);
case pilih of
1 : input;
2 : output;
3 : maksimum;
4 : minimum;
5 : rerata_semua();
6 : writeln('Terima kasih');
end;
// until pilih=6;
write('Ingin menampilkan apa[2/3/4/5/6] ?');readln(pilih);
case pilih of
2: output;
3: maksimum;
4: minimum;
5: rerata_semua();
6: writeln('Terima kasih');
end;
end.
When I run my code, input the data, and diplay the data it's work just fine. But when I try the menu maksimum or minimum or rerata_semua with option e (which 'Rata-rata akhir') It return 0
b. Nilai UAS
c. Nilai Tugas
d. Nilai Praktikum
e. Nilai Akhir
Masukkan Pilihan [a/b/c/d/e] ? : e
Nilai terbesar NA adalah 0.00
why the value not stored in dtmhs[i].akhir record? Anybody can help? Thanks in advance
1 answers
solution1
1 ACCPTED 2021-05-22 11:51:23
As far as I can see, namax , namin and reata_akhir all use dthms[i].akhir for calculation. However, dthms[i].akhir is only calculated in procedure output and that procedure is only called by selecting "2" in the main menu. Probably you should consider a change of that fact.
There is also another error, I think. In procedure output you are also calculating a grade . This is not a personal variable (not part of the mhs record) but a single common value. Meaning that all "students" (I presume) will have the grade of the last student in the output table
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