1. Cèšèªãšã¯
ä»æ¥ãã³ã³ãã¥ãŒã¿ããã®åšèŸºæ©åšã®å€ãã¯ããã°ã©ãã³ã°èšèªã«ãã£ãŠåããããŠããŸãããã®äžã§ããCèšèªã¯ãã®ä»£è¡šæ ŒãšããŠå€ãã®å Žæã§äœ¿çšãããŠããŸããæ¬èšäºã§ã¯ãCèšèªã®ç¹åŸŽããã®å©çšå Žé¢ãæŽå²ã«ã€ããŠè§£èª¬ããŠãããŸãã
1.1 Cèšèªã®ç¹åŸŽ
Cèšèªã¯ããã®æ±çšæ§ãšå¹çæ§ã®é«ãããå€ãã®å Žé¢ã§å©çšãããŠããŸããCèšèªã¯ãã³ã³ãã¥ãŒã¿ã®äœæ°Žæºæäœã«å¯Ÿå¿ããŠãããããããŒããŠã§ã¢çŽæ¥ã®æäœãå¯èœã§ããªãã¬ãŒãã£ã³ã°ã·ã¹ãã ãããŒã¿ããŒã¹ã®ãããªã·ã¹ãã ãœãããŠã§ã¢ãäœãã®ã«é©ããŠããŸãã
ãŸããCèšèªã¯ããã·ãŒãžã£åèšèªã®ä»£è¡šæ Œã§ãããæç¶ããéèŠããããã°ã©ãã³ã°ã¹ã¿ã€ã«ãç¹åŸŽã§ãã
1.2 å©çšå Žé¢ãšã¡ãªãã
Cèšèªã¯ããã®æ§èœã®é«ããšçŽæçãªèšè¿°æ¹æ³ããå¹ åºãçšéã§å©çšãããŠããŸããå ·äœçã«ã¯ããªãã¬ãŒãã£ã³ã°ã·ã¹ãã ãããŒã¿ããŒã¹ã·ã¹ãã ã®éçºãçµã¿èŸŒã¿ã·ã¹ãã ã®å¶åŸ¡ãé«éãªã²ãŒã ãšã³ãžã³ããããŠåŠç¿çšã®ææãªã©ãšãã£ãå€æ§ãªåéã§æŽ»èºããŠããŸãã
Cèšèªã®ã¡ãªãããšããŠã¯ããŸããã®å¹çæ§ãæããããŸããCèšèªã¯ããã°ã©ã ã®å®è¡é床ãéããæé©åãããããããããªãœãŒã¹ãéãããç°å¢ã§ã®ããã°ã©ãã³ã°ã«é©ããŠããŸãã
ãŸããCèšèªã¯éåžžã«è¯ãèšèšãããèšèªã§ããã®æ°åŠçãªå³å¯ããšäžè²«æ§ã®ããã«ãããã°ã©ãã³ã°ã®ææãšããŠäœ¿çšãããããšãå€ãã§ããCèšèªãç解ããã°ä»ã®èšèªãç解ããã®ã容æã«ãªããšãèšãããŠããŸãã
1.3 Cèšèªã®æŽå²
1960幎代åŸåããã«ç 究æã§OSïŒãªãã¬ãŒãã£ã³ã°ã·ã¹ãã ïŒéçºçšã®èšèªãšããŠéçºãããŸãããç¹ã«1970幎代ã«UNIX OSã®éçºã«äœ¿ããããã®åŸ1978幎ã«ã¯åçã®”The C Programming Language”ãåºçãããäžçäžã§åºã䜿ãããããã«ãªããŸããã
Cèšèªã¯ä»¥éããã®æ±çšæ§ãšå¹çæ§ããå€ãã®ãœãããŠã§ã¢ã®éçºã«äœ¿ãããããã«ãªããä»ã®å€ãã®èšèªã®èšèšã«ã圱é¿ãäžããŸãããä»ã§ã¯C++ãObjective-CãC#ãªã©ãCèšèªã«æºãçºããèšèªãå€æ°ååšãããã®äŸ¡å€ãšåœ±é¿åã¯èšãç¥ããŸããã
2. ç°å¢èšå®
Cèšèªãå§ããåã«ããŸãã¯éçºãè¡ãããã®ç°å¢ãæŽããå¿ èŠããããŸããããã§ã¯ãéçºç°å¢ã®éžæãã€ã³ã¹ããŒã«æ¹æ³ããããŠãã®èšå®ã«ã€ããŠè©³ãã説æããŠãããŸãããã
2.1 éçºç°å¢ã®éžæ
éçºç°å¢ãšã¯ãããã°ã©ãã³ã°ãè¡ãããã«å¿ èŠãªãœãããŠã§ã¢ãããŒã«ããã¹ãŠæã£ãŠããã·ã¹ãã ã®ããšãæããŸãã
çŸåšãå€ãã®Cèšèªéçºç°å¢ãååšããŸããããã®äžã§ãåããŠããã°ã©ãã³ã°ãåŠã¶æ¹ã«ãããããªã®ãCode::Blocksã§ããCode::Blocksã¯ããã®äœ¿ãããããšå®å®æ§ããååŠè ãããããã§ãã·ã§ãã«ãŸã§å¹ åºã䜿çšãããŠããŸãã
2.2 ã€ã³ã¹ããŒã«æ¹æ³
Code::Blocksã®ã€ã³ã¹ããŒã«ã¯ãšãŠãç°¡åã§ããå ¬åŒãŠã§ããµã€ãããã€ã³ã¹ããŒã©ãŒãããŠã³ããŒãããæ瀺ã«åŸã£ãŠé²ãã°ãã¿ãŸããWindowsãMacãLinuxãšãã£ãäž»èŠãªOSã«å¯Ÿå¿ããŠããŸãã®ã§ã䜿çšããŠããã³ã³ãã¥ãŒã¿ã®OSã«åãããŠéžæããŠãã ããã
2.3 éçºç°å¢ã®èšå®
Code::Blocksãã€ã³ã¹ããŒã«ãããã次ã«éçºç°å¢ã®èšå®ãè¡ããŸããããã§éèŠãªã®ã¯ãã³ã³ãã€ã©ã®éžæã§ããCèšèªã®ã³ãŒããå®è¡å¯èœãªåœ¢åŒã«å€æãã圹å²ãæãããŠããŸãã
Code::Blocksã§ã¯ãããã©ã«ãã§GCCã³ã³ãã€ã©ã䜿çšãããŸããããã¯Cèšèªã®æšæºçãªã³ã³ãã€ã©ã§ããã倧äœã®ããã°ã©ã ã¯ãã®ã³ã³ãã€ã©ãçšããŠåé¡ãªãåäœããŸãã
èšå®ãå®äºããããç°¡åãªããã°ã©ã ãæžããŠãã®åäœã確èªããŸãããããHello, World!ããšè¡šç€ºãããããã°ã©ã ïŒHello Worldããã°ã©ã ïŒã¯ãããã°ã©ãã³ã°åŠç¿æã«ã¯åžžã«æåã®äžæ©ãšãªããã®ã§ãã
ç°å¢èšå®ã¯åããŠã®æ¹ã«ã¯é£ããæãããããããŸããããäžã€ãã€é²ããŠããããšã§ç解ãæ·±ãŸãã次第ã«ã¹ã ãŒãºã«åãçµãããšãã§ããããã«ãªããŸãã
3. Cèšèªã®åºæ¬ææ³
Cèšèªã®åºæ¬ææ³ãç解ããã«ã¯ããŸãå€æ°ãšããŒã¿åã次ã«æŒç®åãšæŒç®ã次ã«å¶åŸ¡æ§æãšæåŸã«é¢æ°ãç解ããããšãéèŠã§ãã
3.1 å€æ°ãšããŒã¿å
å€æ°ãšã¯ãããªã¥ãŒïŒå€ïŒãæ ŒçŽããããã®ååä»ãã®é åã®ããšãæããŸããããŒã¿åã¯ããã®å€æ°ãã©ã®ãããªçš®é¡ã®å€ãä¿æã§ãããã瀺ããã®ã§ãã
å€æ°ã¯ãå€ãæ ŒçŽããç®±ã®ãããªãã®ãšèãããšããããããã§ããããå€æ°ã«ã¯å€ãæ ŒçŽããããšãã§ãããã®å€ãå¿ èŠã«å¿ããŠèªã¿åºãããæžãæãããããããšãã§ããŸãã
äžæ¹ãããŒã¿åã¯ãå€æ°ãã©ã®ãããªçš®é¡ã®å€ãä¿æã§ãããã決å®ããŸããäŸãã°ãæŽæ°ãä¿æããå€æ°ãæµ®åå°æ°ç¹æ°ãä¿æããå€æ°ãæåãä¿æããå€æ°ãªã©ããããŸãã
3.2 æŒç®åãšæŒç®
Cèšèªã«ã¯æ§ã ãªæŒç®åãååšãããããã䜿çšããŠå€ãèšç®ããããšãã§ããŸããäŸãã°å ç®ãæžç®ãä¹ç®ãé€ç®ãè¡ãããã®ç®è¡æŒç®åããçãããçãããªããšãã£ãæ¯èŒãè¡ãããã®æ¯èŒæŒç®åããããŸãã
ããã«æŒç®åã®çµã¿åããã䜿çšããŠããè€éãªèšç®ãè¡šçŸããããšãå¯èœã§ããäŸãã°ãåè¿°ã®ç®è¡æŒç®åãæ¯èŒæŒç®åãçµã¿åãããŠãè€æ°ã®å€ã®èšç®ãæ¡ä»¶åå²ãè¡šçŸããããšãã§ããŸãã
3.3 å¶åŸ¡æ§æ
Cèšèªã®å¶åŸ¡æ§æãšã¯ãããã°ã©ã ã®å®è¡ãããŒãå¶åŸ¡ããããã®æ§æã§ãããã®å¶åŸ¡æ§æã«ãããç¹å®ã®æ¡ä»¶äžã§ç¹å®ã®ã³ãŒããå®è¡ããããã³ãŒãã®ç¹å®ã®éšåãç¹°ãè¿ãå®è¡ãããããããšãå¯èœã«ãªããŸãã
æãåºæ¬çãªå¶åŸ¡æ§æã«ã¯ãifæãforæãwhileæããããŸãããããã¯ããã°ã©ã ã®æ¡ä»¶åå²ãã«ãŒãåŠçã«äœ¿ãããŸãã
3.4 é¢æ°
é¢æ°ãšã¯ãç¹å®ã®åŠçãè¡ããçµæãè¿ãããã®ã³ãŒãã®éãŸãã§ããé¢æ°ã¯äžåºŠå®çŸ©ããŠããŸãã°ãäœåºŠã§ã䜿ããŸããããšãå¯èœãªã®ã§ãåããããªåŠçãäœåºŠãæžãå¿ èŠã¯ãããŸããã
é¢æ°ã®å®çŸ©ã«ã¯ãé¢æ°åãšåŒã³åºããããšãã«å®è¡ããã³ãŒãããããŠãã©ã¡ãŒã¿ïŒé¢æ°ã«æž¡ãããå€ïŒãšæ»ãå€ïŒé¢æ°ã®çµæïŒãå«ãŸããŸãã
é¢æ°ã䜿ãããšã«ãããã³ãŒãã®èŠéããè¯ãããåå©çšæ§ãšã¡ã³ããã³ã¹æ§ãé«ããããšãã§ããŸãã
4. Cèšèªã®å®è·µçãªå©çš
ããŠããããŸã§Cèšèªã®åºæ¬çãªææ³ãèšå®æ¹æ³ããã§ãã¯ããŠããŸãããããã§ã¯æ¬¡ã«ããããã®ç¥èãå®éã®ããã°ã©ã äœæã«ã©ã®ããã«æŽ»çšã§ãããèŠãŠãããŸãããã
4.1 æšæºå ¥åºå
ããã°ã©ã ãããããäœããããã®ãªã®ãããã®ã»ã³ãã¡ã³ã¿ã«ãªéšåã¯ãŠãŒã¶ãŒãšã®å¯Ÿè©±ã ãšèšããŸãããã®å¯Ÿè©±ã®äžåœ¢æ ã§ããæšæºå ¥åºåã¯ãCèšèªã«ãããåºæ¬çãªã³ãã¥ãã±ãŒã·ã§ã³æ段ã§ããæšæºåºåãšã¯ãããã°ã©ã ãæ å ±ãç»é¢ã«è¡šç€ºããããšã§ãæšæºå ¥åãšã¯ãŠãŒã¶ãŒããã®ããŒã¿ååŸã®ããšãæããŸãã
4.2 ãã¡ã€ã«æäœ
ãããŠãããã°ã©ã ãããå ·äœçãªæ¥åãåŠçããããã«ã¯ããã¡ã€ã«æäœã®èœåãå¿ èŠã§ããCèšèªã¯ãfopenããfcloseããfgetcããfputcããšããé¢æ°ãéããŠãã¡ã€ã«ã®ãªãŒãã³ãã¯ããŒãºãèªã¿æžããè¡ãããšãã§ããŸãããããã®é¢æ°ã䜿ãã°ãããŒã«ã«ã®ããã¹ãããŒã¿ãåãæ±ãããšãå¯èœãšãªããè€éãªããŒã¿åŠçã¿ã¹ã¯ã«ã察å¿ã§ããŸãã
4.3 ãã€ã³ã¿ã®å©çš
ãŸããCèšèªããã°ã©ãã³ã°ã«ãããŠã¯ãã€ã³ã¿ã®æŠå¿µãéèŠã§ãããã€ã³ã¿ã¯å€æ°ã®ã¢ãã¬ã¹ïŒã¡ã¢ãªäžã®äœçœ®ïŒãæã瀺ããã®ã§ããã€ã³ã¿ã䜿ãããšã§å¹ççã«ã¡ã¢ãªãæäœããããšãå¯èœãšãªããŸãã
4.4 é åãšæåå
ãããŠã倧éã®ããŒã¿ãå¹çããåŠçããããã«Cèšèªã§ã¯é åãšåŒã°ããããŒã¿æ§é ã䜿çšããŸãããŸããé åã®äžçš®ã§ããæååã¯ãäžé£ã®æåãæ ŒçŽããããã«äœ¿çšãããŸããæååã¯ããã«ã¯ã©ãŒããŒã·ã§ã³ã§å²ã£ãæåã®äžŠã³ã§è¡šãããçµç«¯ã«ã¯”ïŒãã«æåïŒãå«ã¿ãŸãã
5. ãšã©ãŒãšãããã°æ¹æ³
Cèšèªã®ããã°ã©ã ãäœæããéã«åºäŒãã§ãããåçš®ãšã©ãŒãããããã解決ããããã®æ段ã«ã€ããŠè§£èª¬ããŸãããŸããããå¹ççã«ãšã©ãŒãèŠã€ãåºãä¿®æ£ããããã®ãããã°ææ³ã«ã€ããŠã玹ä»ããŸãã
5.1 ãšã©ãŒã®çš®é¡
Cèšèªã®ããã°ã©ã ã§ããèŠããããšã©ãŒã¯äž»ã«ã³ã³ãã€ã«ãšã©ãŒãå®è¡æãšã©ãŒãè«çãšã©ãŒã®ïŒã€ã«åããããŸãã
ã³ã³ãã€ã«ãšã©ãŒã¯ãã®åã®éãã³ã³ãã€ã«ããéã«çãããšã©ãŒã§ãææ³çãªééããååšããªãé¢æ°ã®åŒã³åºããªã©ãåå ã§èµ·ãããŸãã
å®è¡æãšã©ãŒã¯ããã°ã©ã ã®å®è¡äžã«çºçãããšã©ãŒã§ããŒãé€ç®ãååšããªãã¡ã¢ãªé åãžã®ã¢ã¯ã»ã¹çãèŠå ãšãªããŸãã
è«çãšã©ãŒã¯ããã°ã©ã ãæ£åžžã«åäœãããã®ã®ãæå³ããåäœãšã¯ç°ãªãçµæãçãããããšã©ãŒã§ãåå ã®ç¹å®ãä¿®æ£ãé£ãããšãããŸãã
5.2 ãšã©ãŒå¯ŸåŠæ³
ããããã®ãšã©ãŒã«å¯Ÿãã察åŠæ³ã¯ããšã©ãŒã¡ãã»ãŒãžã®å 容ãæ£ç¢ºã«èªã¿åãããšããå§ãŸããŸãããšã©ãŒã¡ãã»ãŒãžã«ã¯ãšã©ãŒãçºçããè¡çªå·ãããšã©ãŒã®å 容ãèšèŒãããŠããŸãããããå ã«ãå ·äœçãªåé¡ç¹ãç¹å®ããŸãããã
ã³ã³ãã€ã«ãšã©ãŒã«å¯ŸããŠã¯ããšã©ãŒã¡ãã»ãŒãžããæ瀺ãããææ³çãªåé¡ãä¿®æ£ããããšã§è§£æ±ºããŸããå®è¡æãšã©ãŒã«ã€ããŠã¯ãäŸå€çãªç¶æ³ïŒãŒãé€ç®ãªã©ïŒãžã®å¯Ÿå¿ãããªããŒã·ã§ã³ãé©åã«è¡ãããšãæ±ããããŸãããŸããè«çãšã©ãŒã«ã€ããŠã¯ãæå³ããåŠçãšããã°ã©ã ã®åäœã詳现ã«æ¯èŒæ€èšããããšã§ããã®å·®ç°ãèŠã€ãåºãä¿®æ£ããŸãã
5.3 ãããã°ææ³ã®çŽ¹ä»
ãšã©ãŒçºèŠã»ä¿®æ£ãããå¹ççã«è¡ãããã«ã¯é©åãªãããã°ææ³ãçšããããšãéèŠã§ãããã®äžã€ããããã¬ã®äœ¿çšã§ãããããã¬ãçšããããšã«ããããã¬ãŒã¯ãã€ã³ããèšå®ããŠããã°ã©ã ã®éäžç¶æ ã確èªããããå€æ°ã®å€åãã¹ããããã€ã¹ãããã§è¿œãããšãã§ããŸãã
ãŸãããŠããããã¹ããå°å ¥ããããšãæå¹ã§ãããŠããããã¹ãã¯åé¢æ°ãäºæããåäœãããŠãããããã¹ããããã®ã§ããã¹ãã±ãŒã¹ã®äœæã»å®è¡ã«ãããäºæããªãåäœãçºèŠããããšãå¯èœã«ãªããŸãã
以äžã®ææ³ã掻çšããããšã§ããšã©ãŒã®çºèŠãšä¿®æ£ãå¹ççã«è¡ãããšãå¯èœã«ãªããŸãã
6. å¿çšç·šïŒCèšèªã§ã®ãããžã§ã¯ãå®è£
ããã§ã¯ãCèšèªãçšãããããžã§ã¯ãã®å®è£ ã«ã€ããŠè§£èª¬ããŸããæ§é äœãšã¡ã¢ãªç®¡çã®åºæ¬ãããå€æ¬¡å é åãã©ã€ãã©ãªã®äœ¿çšæ¹æ³ã«ã€ããŠè¿°ã¹ãããã«ãã©ã¯ãã£ã«ã«ãªç¥èãšããŠãããžã§ã¯ãã®äœãæ¹ãŸã§ãåŠã³ãŸãã
6.1 æ§é äœãšã¡ã¢ãªç®¡ç
æ§é äœã¯ãç°ãªãåã®å€æ°ãã²ãšãŸãšãã«æ±ãçºã®äŸ¿å©ãªããŒã«ã§ããããããã®å€æ°ã¯äžã€ã®ãã£ãŒã«ããšããŠæ§é äœå éšã§å®£èšãããŸãã
struct Person { char name[50]; int age; float weight; };
ãã®ãããªæ§é äœã䜿çšããããšã§ãç°ãªãããŒã¿ã¿ã€ããäžã€ã®ããã±ãŒãžãšããŠæ±ã£ãããæ§é äœå éšã§ããããã®æ å ±ãä¿æãããããããšãã§ããŸãããŸããã¡ã¢ãªç®¡çã«ãããŠãæ§é äœã¯åœ¹ç«ã¡ãŸããäŸãã°ãæ§é äœã®ã¬ãŒããžã³ã¬ã¯ã·ã§ã³(äžèŠã«ãªã£ãã¡ã¢ãªã®èªåçãªè§£æŸ)ãã¡ã¢ãªãªãŒã¯(äžäœ¿çšã®ã¡ã¢ãªã解æŸãããã«æ®ã£ãŠããŸãçŸè±¡)ã®é²æ¢ãšãã£ãéèŠãªã¿ã¹ã¯ãå©ããããšãå¯èœã§ãã
6.2 å€æ¬¡å é åãšåçé å
å€æ¬¡å é åã¯ãéåžžã®é åãããäžå±€ãããŒã¿ã綿å¯ã«ç®¡çããå¯äžã®æ段ã§ãã
int multiArray[5][5];
ãã®2次å é åã¯ã5è¡5åã®ãããªãã¯ã¹ãšããŠèããããšãã§ããã¹ãã¬ããã·ãŒãã®ãããªåœ¢åŒã§ããŒã¿ãä¿åããã®ã«æé©ã§ãã
äžæ¹ãããã°ã©ã ãå®è¡ãããæç¹ã§é åã®å€§ãããããããªãå Žåãåçé åã䜿çšããŸããããã«ãããã©ã³ã¿ã€ã äžã«é åã®ãµã€ãºãå€æŽå¯èœãšãªããŸãã
int* dynamicArray; dynamicArray = malloc(5 * sizeof(int));
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6.3 ã©ã€ãã©ãªã®äœ¿ãæ¹
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