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ӋC֪Rc(din)

r(sh)g2024-09-05 17:01:02 ӋCȼ ҪͶ
  • P(gun)]

2017ӋC֪Rc(din)

ȫӋCȼԇȫyһ}yһԇPԇϙCԇYϵʽСxӋC֪Rc(din)gӭ!

2017ӋC֪Rc(din)

ӋC֪Rc(din)

1)YN: Y , ѭh(hun)Y((g)ѭh(hun)Y), xY(if switch)

2)xҪmain(), Ȼx(ѭh(hun)ѭh(hun),xx)

3)ӋCĔXб M(jn)Ƶʽ. ŵλþ ĵַ.

4)bitλ ָ0 1 byte ָֹ, һ(g)ֹ = ˂(g)λ.

5)һҪӛס M(jn) ΄ ʮM(jn)

ģ

1gA̎CZ(y)Եһ\Еr(sh)gCZ(y)ԾgijQ(chng)ԴASCIIֵıļ

2ÿ(g)CZ(y)Գmainֻһ(g)

3ںвٶx

4㷨һҪݔԛ](mi)ݔ

5breakѭh(hun)YswitchZ(y)

6̖\ļe

һ

1)ϷÑ(h)R飺

ϷҪĸ„(xin)MԪؾe

ҵһ(g)횞ĸt„(xin)һ(g)锵־e

P(gun)IֲÑ(h)R̖main define scanf printf P(gun)IԻĵطIfǿÑ(h)RIfеĵһ(g)ĸ(xi)ԲP(gun)I

2)(sh)͔ĺϷʽ

2.333e-1 ǺϷҔ2.333×10-1

ԇEeǰeДe؞.

3)ַĺϷʽ:

'1' ַռһ(g)ֹ"1"ַռɂ(g)ֹ(һ(g)Y̖)

'0' ASCIIֵʾ48'a' ASCIIֵ97'A'ASCIIֵ65

4) һǃɂ(g)ֹ, ַһ(g)ֹpһ4(g)ֹ

ԇr(sh)һ(hu )f(shu)16λgϵy32λϵy@NrҪȥһ}һǃɂ(g)ֹ, ַһ(g)ֹpһ4(g)ֹͿ

5)DxַĿ飺

ڳ int a = 0x6dǰһ(g)ʮM(jn)ƵĔo׃a ע@0x횴

ڳ int a = 06d, һ(g)M(jn)Ƶʽ

Dxַ’\x6d’ ǺϷ0܌(xi)xС(xi)

‘\141’ ǺϷ 0Dz܌(xi)

‘\108’ǷǷ鲻ԳF8

6)g(sh)\̖ă(yu)ȼe

ͬeеǏеǏҵ

7)(li)DQ

һ (int)a int(a)ע(li)һ̖

ע(int)(a+b)(int)a+b ą^e ǰǰa+bDǰaDټb

8)_ʽĿ飺

DZ_ʽһДֵ

xֵ_ʽ_ʽֵ߅Ĕֵa=b=5;ԓ_ʽ5xֵ

ԼԜp_ʽOa=5++a(Ǟ6) a++(5);

\еęC++a Ȱ׃Ĕֵ1ȻѵõĔֵŵ׃aȻ@

(g)++a_ʽĔֵ6a++ԓ_ʽĔֵ5ȻٰaĔֵ16

ٷŵ׃a M(jn)++aa++ijõaԒ(hu)׃aе6

ԇE++ǰȼӺ++ںú

̖_ʽ(yu)ȼe ;_ʽĔֵ̖߅ǂ(g)_ʽĔֵ

(234)ı_ʽĔֵ4

9)λ\Ŀ飺

(hu )һ}ԇ}Ŀ

̎׺еλ\}ĿҪ@(g)́(li)̎(ȰʮM(jn)׃ɶM(jn)׃ʮM(jn))

1char a = 6, b;

b = a<<2; @N}ĿӋҪaʮM(jn)6ɶM(jn)λ\

2һҪӛס

3ڛ](mi)ȥĕr(sh)<<һλʾ2;>>һλʾ2

10)018ĔֵǷǷM(jn)Ǜ](mi)88M(jn)1

11)%̖߅Ҫe

12)NȡGСr

1int a =1.6;

2(int)a;

ڶ

1)printfĸʽ飺

%d;%cַ;%fξȵȵȵR

%ld long int;%lf double

2)scanfĸʽ죺

עԓĵڶ(g)&a @ӵĵַa;

Scanf(“%d%d%*d%d”,&a,&b,&c); ^(gu)ݔĵ(g)

3)putchar ,getchar Ŀ飺

char a = getchar() Ǜ](mi)ЅIP(pn)õݔһ(g)ַo׃a

putchar(‘y’)ַyݔĻ

4)Ό(sh)Fɂ(g)׃x yДֵĻQ(Ҫ(li))

԰ x=y ,y=x; Ҫg׃ t=x;x=y;y=t

5)Ό(sh)FλСλij(Ҫ(li))

@(g)ƏVxע x = (int)x @ǰСȥ

؄eҪע⣺cZ(y)÷0ʾ߉݋0ʾ߉݋ٵ

1)P(gun)ϵ_ʽ

_ʽĔֵֻܞ1(ʾ)0(ʾ)

P(gun)ϵı_Ǟĕr(sh)õ1 9>8@(g)Ա_ʽĔֵ1;

2)߉݋_ʽ

ֻܞ1(ʾ)0(ʾ)

a) && || ! N߉݋\̖

b) !>&&>|| (yu)ȵļe

c) ע·Fԇ^ϲg

d) Ҫʾ x DZ010Сķ0

3)if Z(y)

else cӽifқ](mi)elseMϵ

4)l_ʽ

_ʽ1 ?_ʽ2 _ʽ3

עǮ0r(sh)DZ_ʽ2Ĕֵ0ǾDZ_ʽ2Ĕֵ

ԇEǰٺ

5)switchZ(y)䣺

a)һҪע break ͛](mi)breakIJe(sh)(34(y))ăɂ(g)](mi)breakr(sh)ֻҪһ(g)caseƥʣµĶҪbreaktֱswicheZ(y)

b)switchֻԺbreakһԺcontinue

1)Nѭh(hun)Y

a)for() ; while(); do- while()N

b)forѭh(hun)бǃɂ(g)̖ǧf(wn)Ҫӛ

c)(xi)ĕr(sh)һҪעѭh(hun)һҪнYėltѭh(hun)

d) do-while()ѭh(hun)һ(g)while();ķ̖һ܉G(ϙCe)

2) break continueIJe

ӛ

breakǴƵ˼((g)ѭh(hun))ԿҊ(jin)break˳悀(g)һѭh(hun)

continue^m˼(^mѭh(hun)\)ҪYѭh(hun)ѭh(hun)wʣµZ(y)䲻وѭh(hun)_(ki)ʼȻДѭh(hun)lM(jn)һ݆ѭh(hun)

3)Ƕѭh(hun)

ѭh(hun)߀ѭh(hun)@N^sҪһһһһĵ`ӋһӛסɌ̎SM

4) while((c=getchar())!=’\n’) while(c=getchar() !=’\n’)IJe

ȿa = 3 != 2 (a=3)!=2 ą^e

(!=̖ļe=̖ Եһ(g)Ӌ 3!=2) һ(g)aĔֵǵõ1;ڶ(g)aĔֵ3

ԇעc(din): ̖@Ҫ

Ǿһܵһ(g)K;

1) ąֵؔ(ʾD)

main()

{

int a = 5,b=6,c;

c = add(a,b);

printf(“%d”,c);

}

a,bnj(sh)

(g)õһ(g)ֵ

Addķֵؔ

int add ( int x, int y)

{

int z;

z=x+y;

return z;

}

xyʽ

ֵؔ

z@(g)addӋõĽYǺؽoķֵؔ

ڏ˺addabĔֵo{ú򕺕r(sh)Дȴֵؔõ˷ֵؔˆ

2)һҪעⅢ֮gĂf

(sh)΅֮g ֵַ͂IJe(ԇc(din))

ֵԒ(hu)΅׃(hu )׃(sh)׃

ַԒ(hu)΅׃͕(hu )пܸ׃(sh)׃

3)•Ŀ飺

һҪУķ(li)ą(li)

һҪУ΅Q(chng)

ָ׃ı|(zh)Á(li)ŵַһ׃ǷŔֵ

int *p *ppIJe

*pԮ׃(li);*ȡַpĔֵ

pǮַ(li)ʹ

*p++ (*p)++֮gIJee}ĿкҪ

*p++ ַ(hu )׃

(*p)++ ǔֵ(hu )Ҫ׃

x(ԇc(din))

Mʾһ(g)ԪصĵַMԼǵַ(˺ܶ)

ʾԓڵַ

ַʾһ(g)ַĵַ

1һSMҪ

a[10]@(g)MӑՓ

1aʾMǵһ(g)ԪصĵַҲԪa[10]ĵַ

2aǵַֻҪFa++a=a+2xֵĶe`

3aһSMָҲf(shu)a+1һ

a[3][3]ӑՓ

1aʾMǵһ(g)ԪصĵַҲԪa[10]ĵַ

2aǵַֻҪFa++a=a+2xֵĶe`

3aǶSMָҲf(shu)a+1һ

4a[0]a[1]a[2]ҲǵַԌM(jn)xֵͬr(sh)ָa[0]+1a[1]+1a[2]+1һ

5עaa[0] a[1]a[2]DzͬĻ(li)DzͬǰһԪһԪ

SM}Ŀļɣ

a[3][3]={1,2,3,4,5,6,7,8,9}@ӵ}Ŀ

Eһ(xi)ɣ

һСڶС

a[0]à 1 2 3 ->һ

a[1]à 4 5 6 —>ڶ

a[2]à 7 8 9 ->

E@}Ŀgܺ(jin)Σ

*(a[0]+1)҂֪ǵһеĵһ(g)Ԫһô@a[0][1]Ԫ1

*(a[1]+2)҂֪ǵڶеĵһ(g)Ԫô@a[1][2]Ԫ6

һӛֻҪǶSM}Ŀһnj(xi)ϵĸʽȥ}Ŀ@ӕ(hu )^(jin)

MijʼһSͶSһSԲ(xi)Sڶ(g)һҪ(xi)

int a[]={12} Ϸ int a[][4]={234}Ϸ int a[4][]={234}Ƿ

SMеָ

int a[1][2];

aFھһ(g)ָa+1һДMԪ (*)p[2]ָ

a[0]a[1]Fھһ(g)ָa[0]+1 һ(g)MԪ*p[2]ָᘔMʹ

߀ӛסÓ·t

a[2] ׃ *(a+2) a[2][3]׃ *(a+2)[3]ٿ׃ *(*(a+2)+3)

@(g)˼Ҫ!

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