tap hop lenh duoc chay theo thu tu.
ban luyen
Perl
lo trinh thuc hanh de hoc Perl tu con so 0
dinh nghia truoc
Perl la gi
Perl dung de viet chi dan chinh xac. O day ban hoc theo lo trinh thuc hanh de hoc Perl tu con so 0. Hay bat dau voi mot mo hinh: dau vao qua cac buoc roi thanh dau ra.
thong tin chay toi thieutep
script.plchay perl script.plthoi quen hoc mot phan nho cua Perl, go vi du toi thieu roi chaygia tri la du lieu. bien la ten de giu du lieu.
mot viec nho co ten, nhan dau vao va tao ket qua.
Perl chay code trong script.pl.
doan code dau tien
dau ra chuong trinh
entry point output syntax printprint 42;
dau ra 42pha he ngon ngu
cay pha he Perl
xem Perl den tu dau, gan voi ngon ngu nao, va nen hoc gi tiep.
tu con so 0
1doc mot quy tac2doan dau ra3go bang tri nho4chay kiem tra5lap lai voi mot thay doi
Ngan hang cau hoi
Tim truoc khi luyen
Chon giai doan hoac tim trong ngan hang cua ngon ngu nay roi mo bai tap.
Q 1Lua chonGiai doan 1 dinh nghia
Perl cau 1
Perl cau 1. Chon mo ta phu hop nhat voi in mot gia tri.
Q 2Lua chonGiai doan 1 dinh nghia
Perl cau 2
Perl cau 2. Chon mo ta phu hop nhat voi dat ten cho gia tri.
Q 3Lua chonGiai doan 1 dinh nghia
Perl cau 3
Perl cau 3. Chon mo ta phu hop nhat voi ham tai su dung.
Q 4Lua chonGiai doan 1 dinh nghia
Perl cau 4
Perl cau 4. Chon mo ta phu hop nhat voi tap hop co ban.
Q 5Lua chonGiai doan 1 dinh nghia
Perl cau 5
Perl cau 5. Chon mo ta phu hop nhat voi in mot gia tri.
Q 6Lua chonGiai doan 1 dinh nghia
Perl cau 6
Perl cau 6. Chon mo ta phu hop nhat voi dat ten cho gia tri.
Q 7Lua chonGiai doan 1 dinh nghia
Perl cau 7
Perl cau 7. Chon mo ta phu hop nhat voi ham tai su dung.
Q 8Lua chonGiai doan 1 dinh nghia
Perl cau 8
Perl cau 8. Chon mo ta phu hop nhat voi tap hop co ban.
Q 9Lua chonGiai doan 1 dinh nghia
Perl cau 9
Perl cau 9. Chon mo ta phu hop nhat voi in mot gia tri.
Q 10Lua chonGiai doan 1 dinh nghia
Perl cau 10
Perl cau 10. Chon mo ta phu hop nhat voi dat ten cho gia tri.
Q 11Lua chonGiai doan 1 dinh nghia
Perl cau 11
Perl cau 11. Chon mo ta phu hop nhat voi ham tai su dung.
Q 12Lua chonGiai doan 1 dinh nghia
Perl cau 12
Perl cau 12. Chon mo ta phu hop nhat voi tap hop co ban.
Q 13Lua chonGiai doan 1 dinh nghia
Perl cau 13
Perl cau 13. Chon mo ta phu hop nhat voi in mot gia tri.
Q 14Lua chonGiai doan 1 dinh nghia
Perl cau 14
Perl cau 14. Chon mo ta phu hop nhat voi dat ten cho gia tri.
Q 15Lua chonGiai doan 1 dinh nghia
Perl cau 15
Perl cau 15. Chon mo ta phu hop nhat voi ham tai su dung.
Q 16Lua chonGiai doan 1 dinh nghia
Perl cau 16
Perl cau 16. Chon mo ta phu hop nhat voi tap hop co ban.
Q 17Lua chonGiai doan 1 dinh nghia
Perl cau 17
Perl cau 17. Chon mo ta phu hop nhat voi in mot gia tri.
Q 18Lua chonGiai doan 1 dinh nghia
Perl cau 18
Perl cau 18. Chon mo ta phu hop nhat voi dat ten cho gia tri.
trac nghiem
Perl cau 1
Perl cau 1. Chon mo ta phu hop nhat voi in mot gia tri.
print 42;
tham khao
mau cho script.pl
Perl
perl script.plentry point output syntax print
dau ra chuong trinh
print 42;
- Run the smallest file first
- Print one known value
- Check the output before adding more code
variables assignment types my
gia tri va ten
my $total = 42; print $total;
- Give values readable names
- Keep one idea per line while learning
- Trace the value before changing it
function collection Array
ham va tap hop
sub add {
my ($a, $b) = @_;
return $a + $b;
}
my @scores = (40, 2);
print scalar @scores;- Keep functions small
- Return useful values
- Use the common collection before reaching for frameworks