| excalibr | helo | 02:04 |
|---|---|---|
| fairuz | excalibr: helo | 02:23 |
| excalibr | fairuz, bila kita assign string ke char pointer eg char *foo = "bar" | 03:18 |
| excalibr | apa yg berlaku secara teknikalnya | 03:18 |
| excalibr | /poke fairuz1 | 03:19 |
| fairuz1 | excalibr: oh sorry | 03:19 |
| excalibr | >fairuz, bila kita assign string ke char pointer eg char *foo = "bar" | 03:20 |
| fairuz1 | maksudnya ko akan ada dalam meory dua benda | 03:20 |
| excalibr | >apa yg berlaku secara teknikalnya | 03:20 |
| fairuz1 | *memory | 03:20 |
| excalibr | apa bza kalau assign guna array char foo[] = "bar" | 03:21 |
| fairuz1 | satu ruang direserve untuk simpan "bar", contoh string ni perlukan 4 bytes | 03:21 |
| fairuz1 | jadi tiap2 byte ni ada address dia | 03:21 |
| fairuz1 | dalm kes pertama, foo akan ada nilai address element pertama string ni, dalam kes ni address huruf b | 03:22 |
| excalibr | ok..pointer ke address "bar" dlm memory.. | 03:23 |
| fairuz1 | dalam kes kedua pun sama, foo akan point to the first character | 03:23 |
| fairuz1 | beza dia kat mana "bar" tu disimpan | 03:23 |
| fairuz1 | seingat aku kalau ko pakai char*foo, "bar" tu akan disimpan kat read only memory | 03:24 |
| fairuz1 | so takleh nak tukar | 03:24 |
| fairuz1 | kalau ko pakai char foo[], boleh tuka. e.g. foo[0] = 'T' | 03:24 |
| fairuz1 | excalibr: ok ke | 03:27 |
| fairuz1 | :p | 03:27 |
| excalibr | hmm ok :D lagi satu, kalau aku nak reasssign value char pointer tu ke char array..boleh reassign terus ke? | 03:29 |
| excalibr | char *foo = "bar"; | 03:30 |
| excalibr | char oof[] = "bla"; | 03:30 |
| excalibr | char *foo = oof; | 03:30 |
| excalibr | ^ ok ke buat camni? | 03:30 |
| fairuz1 | boleh sebab foo tu bukan const pointer | 03:30 |
| fairuz1 | so dia boleh nak assign pegi address lain | 03:31 |
| fairuz1 | Kira nak senang, ko kena ingat pointer ni just simpan address | 03:31 |
| excalibr | pastu apa jadi dgn original string yg foo tu point masa mula2? | 03:31 |
| fairuz1 | http://ideone.com/m3XIOC | 03:32 |
| fairuz1 | tengok ni | 03:32 |
| fairuz1 | tu takde sapa point kat dia la | 03:32 |
| fairuz1 | dai duk sorang2 la dalam memory tu, kesian dia | 03:32 |
| fairuz1 | *dia | 03:32 |
| excalibr | hahaa | 03:33 |
| fairuz1 | kalau dari segi technical dia | 03:33 |
| fairuz1 | kalau ko declare benda mcm int i ke | 03:33 |
| fairuz1 | char foo[] = "bar" ke | 03:34 |
| fairuz1 | semua benda ni scope dia auto tak salah aku | 03:34 |
| fairuz1 | jadi dia letak benda ni kat stack scope tu | 03:34 |
| excalibr | tak perlu erase ke string tadi tu? | 03:34 |
| fairuz1 | so contoh ko declare kat dalam function, abis function, benda ni semua free la | 03:34 |
| fairuz1 | tak perlu kalau auto | 03:34 |
| fairuz1 | *scope auto | 03:34 |
| fairuz1 | kalau ko buat char *foo, scope dia static | 03:35 |
| fairuz1 | takkan hilang sampai program habis | 03:35 |
| excalibr | oh camtu | 03:36 |
| fairuz1 | benda2 ni static, dia "embedded" dalam data segment program ko tu | 03:36 |
| fairuz1 | Kalau static data ko byk, besar la program ko | 03:37 |
| fairuz1 | kalau auto storage tu, time ko run tu dia reserve memory | 03:37 |
| excalibr | besar dari segi mem usage? | 03:37 |
| fairuz1 | bukan mem usage, program ko tu yg besar | 03:38 |
| fairuz1 | physically on disk | 03:38 |
| fairuz1 | mem usage ni utk auto storage tu | 03:38 |
| fairuz1 | contoh mcm ni | 03:39 |
| fairuz1 | ko ada variable static 10KB, dengan ko ada declare satu array besar 20KB dalam function X | 03:39 |
| fairuz1 | program ko tu, saiz dia termasuk dengan 10KB variable static tu | 03:40 |
| fairuz1 | kira start2 je program ko, variable static tu dah wujud | 03:40 |
| fairuz1 | array besar tu tak wujud lagi, selagi ko tak masuk dalam function X | 03:40 |
| fairuz1 | X tu tak kesah la function main ke, function buat sendiri ke | 03:41 |
| excalibr | uhhm.. | 03:44 |
| excalibr | static var ni termasuk la constant kan? | 03:46 |
| fairuz1 | mmg constant pun static var ni | 03:47 |
| fairuz1 | read only | 03:47 |
| excalibr | eh yg char pointer tadi tu..kdg2 aku tengok org tulis char* foo | 03:47 |
| excalibr | apa beza dgn char *foo | 03:47 |
| fairuz1 | sama je | 03:49 |
| fairuz1 | kalau setakat char * tu takpe lagi, kalau dah start main function pointer, kena hati2 je la sikit | 03:51 |
| fairuz1 | contoh function pointer void (*foo)(void) | 03:51 |
| fairuz1 | penting kurungan () tu sebab nak kata benda tu function pointer | 03:52 |
| fairuz1 | ko kenapa tiba2 belaja programming plak ni :D | 03:54 |
| excalibr | :D | 03:59 |
| fairuz1 | konsep senang mcm ni je, saiz program = saiz code section + data section | 04:01 |
| fairuz1 | data section dalam kes ni global dengan static variable | 04:01 |
| fairuz1 | global tu, benda2 yang ko declare kat luar main | 04:01 |
| fairuz1 | benda2 yang ko delare dalam main plak, atau dalam mana2 function, takkan ada dalam program ko | 04:02 |
| fairuz1 | unless time runtime, dia akan masuk stack | 04:02 |
| fairuz1 | benda ni la yang aku panggil auto variable tadi | 04:02 |
| fairuz1 | sebab bila dia jumpa penutup function ( } ), variable2 ni semua akan hilang | 04:03 |
| === fairuz1 is now known as fairuz | ||
| excalibr | TIL data section | 04:16 |
| excalibr | :) | 04:16 |
| fairuz | :D | 04:31 |
| excalibr | mcm mana org buat multi patch dlm satu patch file | 06:19 |
| excalibr | buat patch file satu-satu lepas tu concancate ke satu file? | 06:19 |
| fairuz | multipatch tu ape maksud ko excalibr | 06:24 |
| fairuz | patch yg meilibat byk file ke ape | 06:24 |
| excalibr | ye | 06:25 |
| fairuz | patch biasa pun boleh melibatkan byk file | 06:37 |
| fairuz | macam git commit biasa | 06:38 |
| fairuz | satu commit nak ada diff utk 100 files pun boleh | 06:38 |
| fairuz | excalibr: ^ | 06:38 |
| faizul | /names | 06:58 |
| faizul | sorry fairuz | 06:58 |
| faizul | silap taip | 06:58 |
| fairuz | ? | 07:13 |
| fairuz | excalibr: gigih buat C ke ape keke | 07:13 |
| excalibr | wahaha | 07:43 |
| fairuz | aku tengah pening godek spnego Kerberos ni | 07:51 |
| faizul | hi | 08:53 |
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