11. ϵϵʽ
11.1 Cеֵ
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11.2 ϵȴ
Cṩ6ֹϵ
ַɵ֮䲻Լӿոϵ˫Ŀ (1)ԣҡ
(2)ȴǰ4ֹϵ( <<=>=> )ȼͬ (==!=)ȼͬǰ4ȼں֣ϵȼڸֵ
11.3 ϵʽ
ɹϵӶɵıʽΪϵʽ 磺a>b,a=7)>(b=10)ȶǺϷĹϵʽ
ϵʽĽ01,0ʾ٣1ʾ档ϵʽֵΪ棬ϵʽֵΪ١
aֵΪ5bֵΪ6ôϵʽa>bֵΪ٣Ϊ0.ϵʽ a=13)>(b=10)ֵΪ棬Ϊ1
ϵֵͲһʱһͣһʵͣϵͳԶתΪʵȻٽбȽϡ
12. ʽ
12.1 ȼ
ṩ3± ˵
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12.2 ʽ
&&͡||Ƕ˫ĿֻһǵĿ£
1a&&b: &&߶Ϊ桱ʱʽa&&bֵ档
ֵעǣѧУϵʽ0 2a||b: ||һΪ桱ʱʽa||bֵ档 3!a: ʾȡaΪ棬!AΪ٣֮Ȼ磡-5ֵΪ0. ڣУ&&||ɵʽijЩض»· 1x && y && z ֻеxΪ(0)ʱҪбyֵֻxyΪʱҪȥбzֵֻҪxΪپͲбyzʽֵΪ0ھһٱؼ١ 5==1&&++i==0 5==1ʽֵΪ0Լо++i==0˱ʽ5==1&&++i==0ʽֵΪ0. 2x||y||z ,ֻҪxֵΪ()Ͳбyzֵ ʽֵΪ1ֻxֵΪ٣ҪбyֵֻxyֵͬʱΪٲҪбzֵھһ桱 13. λ 13.1 λ ڼУݶԶʽŵģλָԴ洢Ԫжλ㡣Cṩ6λ ˵ 1λг~⣬Ϊ˫ĿҪһ 2ֻͻַݣΪʵݡ 13.2 λ λ & |~<< >> ȼӸߵе˳ǣ λ㡰~ȼߣƺͬڵڶ˳ǰλ &λ ġͰλ |˳Ϊ~ << >> & | 1<<˫Ŀ书ܰѡ<< ߵĸλȫλɡ<<ұߵָƶλλλ0 磺 a<<4 ָaĸλƶ4λa=00000011(ʮ3)4λΪ00110000(ʮ48) 2>>˫Ŀ书ǰѡ>> ߵĸλȫλ>>ұߵָƶλ 磺 a=15 a>>2 ʾ000001111Ϊ00000011(ʮ3) Ӧ˵ǣзʱλͬƶΪʱλ0ΪʱλΪ1λDz0Dz1 ȡڱϵͳĹ涨 3 a00101101 ͨab ʹaĸ4λȡ4λ䣬bǡ :㳣ʹضλתֻҪʹ跭תλ1ͿˣΪԭֵΪ1λ10 ԭֵΪ0λ110λԭֵ㻹ֵʱ int a=3 , b=4뽫abֵʵ֣ a=ab; b=ba; a=ab; ԱĴΪ 11110000 ڶ ˳ṹ 1. C CԵϵͳָһʵʵԴͨ䣬ЩһIJ Cе䣬ڳгֵ˳ִУ乹ɵijṹΪ˳ṹ 1.1 (ɺüһֺŹ) scanf(%d,&a) ʽ(һʽһ) a=b 1.2 C䶼һֺţ ֻһֺmain(){;}ֺҲһ䣬Ϊ䣬ִʱκζʾһ䡣 1.3 Cлš{ }Ŀʼͽ־ͬʱҲĿʼͽ־ҲɳΪ 塱 CУκαʽԼϷֺŹ䣬 i++;ӡᵼºܶϵĴҪãҪáһķֺŲܺԲд 2. ֵ ǰѾֵܸɸֵʽĩβķֺ ɵġҪѶע⣺=롰==ͬǰ߲ǸֵǹϵжϣܰѶΪһ̸硰i=2;ǰֵ2ŵiУi==2жϱiֵǷΪ2j=j+1;ڳִʱȡjеִֵмֵ1IJֵٰŻصjС 3. ʵ (1)ݴӼڲⲿ豸(ʾӡ)͵IJΪ ݴӼⲿ豸(̡ꡢɨǵ)IJΪ 롱 (2)CԱṩ䣬ͨʵIJ (3)ʹCԿ⺯ʱҪԤ #includeйصġͷļûԴļСҪõԤں½ǻϸ 3.1 ַ 3.1.1 ַputchar() putchar( )նһַ 磺 putchar(a); ַaֵaҲַͱͱaͱASCIIֵΪñֵǸַ 3.1.2 ַ뺯getchar() getchar( )ǴնһַgetcharûвֵǴ豸õַ getchar()ֻܽһַgetchar()õַԸһַͱҲԲκαΪʽһ֡һ(Ϊmain())Ҫgetchar()putchar()ڸ֮ǰİ#include 3.2 ݸʽ 3.2.1 printf() printf( )Cṩıն(ϵͳָ豸)ָʽɸݡ a. printf()һʽ printf(ʽƣ); 磺 printf(%f,%d,x,y); printfǺɣ (1)ʽơ˫ַǡʽơַϢ ʽת˵ɡ%ʽַɣ %d%sȡУΪint ʱϵͳ涨dΪʽַˣС%dΪfloatdoubleʱfeΪʽַʽҪһһӦƥ䡣 Ҫԭַ(ָͨ˸ʽ˵һЩתַDz)Ҳдڸʽڡ (2)СҪһЩݣdzʽ磺 printf(x=%d y=%d,x,y); Уx=%d y=%dǸʽ˵ x,y СеĸҪöŸxyֵΪ78 Ϊ x=7 y=8 ֮пոΪʽ˵мһո b. ʽַ ԸҪڡ%ʽַ֮롰˵š-ǰš0ȡ (1)dʽʮС%dݵʵʳ%mdָmΪֶռĿȡ (2)oʽ˽ʽͬͨ硰%8oĸʽָʱռĿȡ (3)xʽʮʽͬͨ硰xĸʽָʱռĿȡ (4)uʽ unsigned ݣŵʮ (5)cʽһַ (6)sʽһַ (7)fʽʵ(˫)Сʽ,ʹȫ (8)eʽָʽʵ (9)gʽʵ fegʽá1??2ʽָȵͬʱָСλλУ1ָռܿȣ2ȷȡȶڲͬĸʽŲͬĺ塣λڡ2ָĿʱȥұ߶СԽȥĵһλС봦ݵСλڡ2ָĿʱСұ0ռĿȴڡ1ָĿʱСλֲʧҲá??2ʽָСλʱռϵͳͨϵͳfloatṩ7λЧλdoubleṩ15λЧλ c. ʹprintf()ʱע (1)ڸʽַУʽ˵ϱһһӦƥ䣬粻ƥ佫ִlongʱһҪ%ldʽƣ%dʽơ (2)ڸʽƴУʽ˵ĸҲҪȣʽ˵ĸĸڶĸʽֵ(0ֵ) (3)ڸʽƴУ˺Ϸĸʽ˵⣬ĺϷַ(תַ)Щַʱԭ (4)Ҫ %Ӧڸʽƴİٷֺš%%ʾ