Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
C Lecture 2013.09.19
Search
masawada
September 19, 2013
Technology
0
150
C Lecture 2013.09.19
masawada
September 19, 2013
Tweet
Share
More Decks by masawada
See All by masawada
10年続くサービスのデータを1日未満のメンテナンスウィンドウで安全に移管する
masawada
5
2.3k
よりよいレビュー環境を求めて / A code review odyssey
masawada
0
2.9k
フロントエンドの秩序は保たれているか?
masawada
1
4.2k
Getting Started with ScratchX
masawada
0
710
GyaPC::Asia Tokyo 2015 LT
masawada
0
1.5k
Privileged Apps with Vue.js
masawada
0
180
Chikubeam
masawada
1
1.5k
Git講習 2014.04.15
masawada
1
330
Hack U at UEC 2014.03.27
masawada
0
1.5k
Other Decks in Technology
See All in Technology
エンジニア向け技術スタック情報
kauche
1
250
Clineを含めたAIエージェントを 大規模組織に導入し、投資対効果を考える / Introducing AI agents into your organization
i35_267
4
1.6k
登壇ネタの見つけ方 / How to find talk topics
pinkumohikan
5
420
Observability infrastructure behind the trillion-messages scale Kafka platform
lycorptech_jp
PRO
0
140
生成AIでwebアプリケーションを作ってみた
tajimon
2
150
AWS Summit Japan 2025 Community Stage - App workflow automation by AWS Step Functions
matsuihidetoshi
1
260
【5分でわかる】セーフィー エンジニア向け会社紹介
safie_recruit
0
26k
あなたの声を届けよう! 女性エンジニア登壇の意義とアウトプット実践ガイド #wttjp / Call for Your Voice
kondoyuko
4
440
HiMoR: Monocular Deformable Gaussian Reconstruction with Hierarchical Motion Representation
spatial_ai_network
0
110
急成長を支える基盤作り〜地道な改善からコツコツと〜 #cre_meetup
stefafafan
0
120
PostgreSQL 18 cancel request key長の変更とRailsへの関連
yahonda
0
120
プロダクトエンジニアリング組織への歩み、その現在地 / Our journey to becoming a product engineering organization
hiro_torii
0
130
Featured
See All Featured
Optimizing for Happiness
mojombo
379
70k
Scaling GitHub
holman
459
140k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
20
1.3k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
130
19k
Large-scale JavaScript Application Architecture
addyosmani
512
110k
Practical Orchestrator
shlominoach
188
11k
How STYLIGHT went responsive
nonsquared
100
5.6k
The Invisible Side of Design
smashingmag
299
51k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
29
9.5k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
31
1.2k
The Straight Up "How To Draw Better" Workshop
denniskardys
234
140k
Transcript
ϓϩάϥϛϯάߨश 2013.09.19 by @masawada, @alstamber
Έͳ͞Μ ͓Α͏͍͟͝·͢
ߨࢣ
masawada
alstamber
ΑΖ͓͘͠ئ͍͠·͢
None
ॾ࿈བྷ
• ձ͕12:00·Ͱ͔͑͠·ͤΜ • MMAͷΠϕϯτͰͳ͍ͨΊڭࣨͱΕͣ • ۭ͍ͯͨΒ13:00-15:00͕ͱΕ·͢ • னٳܜΛ12:00-13:00Ͱ͞Έ·͢
• ৯ਆʹ͍͖·͢(ଟ) • ॏཁͳ෦12:00·ͰʹऴΘΒͤ·͢ • 13:00͔ΒΛղ͖·͢ • ͍ΘΏΔԋश • ్தୀࣨՄͰ͢
• શһ͍ͳ͘ͳͬͨΒΊ·͢ • ॾҙ͍Ͱ͢Ͷ • ͜Μͳײ͡ͰਐΊ·͢ • Θ͔Βͳ͍͜ͱ͋ͬͨΒਵ࣭࣌Λ ͱ͍ͯͩ͘͠͞
ߨशͷର
ޙظ͔Β ϓϩάϥϛϯά௨ ͕࢝·Δ
ϓϩάϥϛϯά Α͘Θ͔ΒΜ
͍ͬͯ͏ਓ͚
ܭࢉػ௨ ͱͬͯͳ͍ͻͱ͚
ຊͷత
ޙظͷतۀʹ ͑͏ΔࣝΛ͚ͭΔ
None
ຊͷ͓͠ͳ͕͖ • ϓϩάϥϛϯάͱ • Cͷجૅ • ม • ੍ޚߏจ •
ྻ/ߏମ • ϙΠϯλ • ؔ • ԋश
ϓϩάϥϛϯάͱ
Scratch
͜Ε ϓϩάϥϛϯά
ͻͱͱ͓Γͷཧղ
•ม/ྻ •੍ޚߏจ •ؔ
+ ݴޠಛ༗ͷػೳ
•ϙΠϯλ •ߏମ
ͦͦͳΜͰ CΛษڧ͢Δͷʁ
Rubyͱ͔Pythonͱ͔ φ͍ݴޠΓ͍ͨ
౦େͩͬͯΞϧΰͰ RubyͬͯΔ͡ΌΜ
•×ίϯϐϡʔλΛಈ͔͢ •◦ίϯϐϡʔλΛཧղ͢Δ
None
ܭࢉػͷΈΛ ཧղ͢Δ
ਖ਼ͦ͜·Ͱ ਂ͘Βͳͯ͘Α͍
• ϓϩάϥϛϯάݴޠҰൠͷߟ͑ํ • Cݴޠಛ༗ͷॻ͖ํ • ͱ͔Λ͞ΒͬͱΓ·͢
Cݴޠͷجૅ
•ίʔυΛॻ͘ •ίϯύΠϧ͢Δ •࣮ߦ͢Δ Cݴޠͷجૅ
$ emacs hello.c --- #include <stdio.h> int main() { printf(“Hello,
world!\n”); return 0; }
$ gcc hello.c -o hello $ ./hello Hello, world!
#include <stdio.h> int main() { printf(“Hello, world!\n”); return 0; }
࣮ͳͯ͘ྑ͍
stdio.h = st(andar)d I(n/)O(ut).h(eader)
ඪ४ೖग़ྗ
•printf •scanf
#include <stdio.h> int main() { printf(“Hello, world!\n”); return 0; }
#include <stdio.h> int main() { printf(“Hello, world!\n”); return 0; }
#include <stdio.h> int main() { printf(“Hello, world!\n”); return 0; }
$ gcc hello.c -o hello ɹ
$ [gcc] hello.c -o hello ίϯύΠϧ༻ίϚϯυ
$ gcc [hello.c] -o hello ίϯύΠϧ͢Διʔείʔυ
$ gcc hello.c [-o] hello outfile Φϓγϣϯ
$ gcc hello.c -o [hello] ϑΝΠϧ໊
$ ./hello Hello, World
Ҏ্ɺCͷجૅ
มͷ
ͻͱͱ͓Γͷཧղ
•ม/ྻ •੍ޚߏจ •ؔ
+ ݴޠಛ༗ͷػೳ
•ϙΠϯλ •ߏମ
• ใͷอଘํ๏(σʔλߏ) • ੍ޚ/ؔ
• ใͷอଘ(σʔλߏ) • มɺྻɺ(ϙΠϯλ)ɺߏମ • ੍ޚ/ؔ • ੍ޚߏจɺؔ
ม
x = 10 y = 20
int x = 10; int y = 20;
ܭࢉػ
ON 1 OFF 0
0100101001010100...
None
•int •float, double ුಈখ(খ) •char จࣈ
• ม: 1ͭͷσʔλΛอଘ͢Δͷ • ≒σʔλʹ໊લΛ͚͓ͯ࣋ͬͯ͘ • ܕσʔλͷछྨΛද͢ ·ͱΊ
੍ޚߏจͷ
ϓϩάϥϜ্͔Β ॱ൪ʹॲཧ
ॱ൪Λม͍͑ͨʂ
ൺֱԋࢉࢠ
<ͱ͔>ͱ͔==ͱ͔
ࢄֶ
a b a < b 0 0 0 0 1
1 1 0 0 1 1 0
0ͳΒِ 0Ҏ֎ͳΒਅ
੍ޚߏจ
•if - else - ݅Ͱذ •while - ಉ͡ॲཧΛ·ͱΊΔ •for -
whileͷ্Ґ൛
if - else
͠ʙͳΒ Ͱͳ͚Ε
aͱbͰେ͖͍ํΛ ग़ྗ͍ͨ͠
int a = 10; int b = 20; if (
a < b ) { printf(“%d\n”, b); } else { printf(“%d\n”, a); }
int a = 10; int b = 20; if (
a > b ) { printf(“%d\n”, b); } else { printf(“%d\n”, a); }
while
ʙͷؒ
10͔Β1·Ͱ Χϯτμϯ͍ͨ͠
int i = 10; printf(“%d\n”, i); i = i -
1; printf(“%d\n”, i); i = i - 1; ...
10 9 8 7 6 5 4 3 2 1
i = i - 1;
int i = 10; // i: 10 int tmp =
i - 1; // i: 10 i = tmp; // i: 9
int i = 10; printf(“%d\n”, i); i = i -
1; printf(“%d\n”, i); i = i - 1; ...
int i = 10; while ( 0 < i )
{ printf(“%d\n”, i); i = i - 1; }
for
whileͷ্Ґ൛
int i = 10; while ( 0 < i )
{ printf(“%d\n”, i); i = i - 1; }
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); }
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); }
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); }
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4 3
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4 3
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4 3
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4 3 2
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4 3 2
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4 3 2
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4 3 2 1
int i; for (i = 10; 0 < i; i
= i - 1) { printf(“%d\n”, i); } 10 9 8 7 6 5 4 3 2 1
·ͱΊ • ॲཧͷॱ൪Λม͑Δͷʹ੍ޚจΛ͏ • ݅Ͱذ͢Δ • ifͱ͔whileͱ͔͍Ζ͍Ζ͋Δ • forwhileͷ্Ґ൛Έ͍ͨͳײ͡
·ͱΊ • ଞʹdo-whileͱ͔switchͱ͔͋Δ • άάͬͯ(͋Μ·ΓΘͳ͍ؾ͕͢Δ)
None
ྻͷ
ม·ͱΊͨͭ
ม·ͱΊͯ ࣈॱʹͳΒͨͭ
a͞ΜͷମॏΛ ྸॱʹه͍ͨ͠
int a0 = 3; ... int a6 = 22; int
a7 = 24; int a8 = 27;
໊લ͚Δͷ͕ ͱͯΊΜͲ͍͘͞
int a[100]; a[0] = 3; ... a[6] = 22; a[7]
= 24; a[8] = 27;
ศརʂʂʂ
int a[100]; ܕ ྻ໊[ ֬อ͢Δ ]; a[0] = 3; ྻ໊[
ఴࣈ ] = ;
จࣈ char
จࣈྻ char[]
char name[8] = “haru067”;
ཉ͍͠จࣈ+1 Ͱ֬อ
char name[8] = “haru067”;
char name[8] = “haru067\0”;
• ྻΛ͏ͱมΛ·ͱΊΒΕΔ • จࣈྻจࣈܕ(char)ͷྻ ·ͱΊ
ߏମͷ
ߏମ දͷΑ͏ͳͷ
ͪΐͬͱ͚ͩ ྻʹࣅͯΔ
໊લ ྸ ମॏ Ұ 19 165 59 ೋ 20
172 64 ࡾ 21 183 72 ࢛ 16 159 53
struct brother { int age; double height; double weight; };
// ηϛίϩϯΘ͢Εͣʹ
struct brother ichiro; ichiro.age = 19; ichiro.height = 165; ichiro.weight
= 59; printf(“%d\n”, ichiro.age); // 19
struct brother ichiro; ichiro.age = 19; ichiro.height = 165; ichiro.weight
= 59; printf(“%d\n”, ichiro.age); // 19
brother ichiro; ichiro.age = 19; ichiro.height = 165; ichiro.weight =
59; printf(“%d\n”, ichiro.age); // 19
͍͍ͪͪstructॻ͘ͷ ΊΜͲ͏
ܕͷΑ͏ʹѻ͍͍ͨ
struct brother { char name[20]; int age; double height; double
weight; };
typedef struct { char name[20]; int age; double height; double
weight; } brother;
·ͱΊ • ߏମؔ࿈͢ΔσʔλΛ·ͱΊΔ • දΈ͍ͨͳײ͡ • ޙظͷߨٛͰׂͱॏཁͬΆ͍
ؔͷ
None
ؔ
f(x) = x * x
͍͍ͩͨ͋ͬͯΔ
int sq (int num) { return num * num; }
int main(){ int a = 3; printf(“%d\n”, sq(a)); return 0; }
Math: f(x) = x * x C: int sq (int
num) { return num * num; }
Math: f(x) = x * x C: int sq (int
num) { return num * num; }
Math: f(x) = x * x C: int sq (int
num) { return num * num; }
Math: f(x) = x * x C: int sq (int
num) { return num * num; }
Math: f(x) = x * x C: int sq (int
num) { return num * num; }
int sq (int num) { return num * num; }
ܕ ໊ؔ ( ܕ Ҿ ) { ॲཧ ؔͷܕʹ߹ͬͨฦΓ }
int sq (int num) { return num * num; }
ܕ ໊ؔ ( ܕ Ҿ, ܕ Ҿ ) { ॲཧ ؔͷܕʹ߹ͬͨฦΓ }
int sq (int num) { return num * num; }
int main(){ int a = 3; printf(“%d\n”, sq(a)); return 0; }
f(x) = x * x b = 3 f(b) =
9
ҾपΓͰ Ή͜ͱͳ͍
ฦΓ
ϙΠϯλ
None
ϙΠϯλ”ࢀর”
• มͷ”ॴ(ΞυϨε)”ΛೖΕΔม • ม: ࣗൢػͷ্ͷϘλϯ • ϙΠϯλม: ࣗൢػͷԼͷϘλϯ ্ͷϘλϯͷ”ॴ”Λ֮͑Δ ͭ·Γɺ”த”Λ֮͑ΔͷͰͳ͍
ϙΠϯλ
// ϙΠϯλͷએݴ // “ॴ”ΛೖΕΔม int *b_button;
// ϙΠϯλͷએݴ // “ॴ”ΛೖΕΔม int *b_button; b_button = &button; //
&มͷ”ॴ”Λࣔ͢
// ϙΠϯλͷએݴ // “ॴ”ΛೖΕΔม int *b_button; b_button = &button; button
= 1;
// ϙΠϯλͷએݴ // “ॴ”ΛೖΕΔม int *b_button; b_button = &button; button
= 1; printf(“%d\n”, *b_button); // 1
ϙΠϯλ”ࢀর”
ϙΠϯλࢦఆ͞Εͨ ॴͷมͷΛݟʹߦ͘
void sq (int *num1, int *num2) { num1 = &a;
num2 = &b; *num1 = *num1 * *num1; *num2 = *num2 * *num2; } int main(){ int a = 3, b = 6; sq(&a, &b); printf(“%d, %d\”, a, b);
·ͱΊ • ಉ͡ॲཧΛผͷॴͰߦ͍ͬͯΔͱ͖ ؔʹ·ͱΊΔͱݟ௨͕͠Α͘ͳΔ • ฦΓ͕ෳͩͬͨΓɺྻͷ߹ ϙΠϯλΛ͏
·ͱΊ • ϙΠϯλࢀর