2-p02_fac阶乘函数

def fac(n):
    result=1
    for i in range(2,n+1):
        result*=i
    return result

class BigInt:
    def __init__(self,value):
        self.digits=[value]
    def mul(self,n):
        addition=0
        for i in range(len(self.digits)):
            digit=self.digits[i]
            value=digit * n + addition
            self.digits[i]=value % 10
            addition=value//10
        while addition>0:
            self.digits.append(addition%10)
            addition//=10

    def __repr__(self):
        result=''
        for digit in reversed(self.digits):
            result+=str(digit)
        return result

def fac2(n):
    result=BigInt(1)#先使用函数后定义
    for i in range(2,n+1):
        result.mul(i)
    return result

if __name__ == '__main__':
    for n in range(1,100+1):
        print(n,'!=',fac2(n))#先使用函数后定义

D:\Anaconda\python.exe D:/AI20/06_codes/deeplearning_20/p02_fac.py
1 != 1
2 != 2
3 != 6
4 != 24
5 != 120
6 != 720
7 != 5040
8 != 40320
9 != 362880
10 != 3628800
11 != 39916800
12 != 479001600
13 != 6227020800
14 != 87178291200
15 != 1307674368000
16 != 20922789888000
17 != 355687428096000
18 != 6402373705728000
19 != 121645100408832000
20 != 2432902008176640000
21 != 51090942171709440000
22 != 1124000727777607680000
23 != 25852016738884976640000
24 != 620448401733239439360000
25 != 15511210043330985984000000
26 != 403291461126605635584000000
27 != 10888869450418352160768000000
28 != 304888344611713860501504000000
29 != 8841761993739701954543616000000
30 != 265252859812191058636308480000000
31 != 8222838654177922817725562880000000
32 != 263130836933693530167218012160000000
33 != 8683317618811886495518194401280000000
34 != 295232799039604140847618609643520000000
35 != 10333147966386144929666651337523200000000
36 != 371993326789901217467999448150835200000000
37 != 13763753091226345046315979581580902400000000
38 != 523022617466601111760007224100074291200000000
39 != 20397882081197443358640281739902897356800000000
40 != 815915283247897734345611269596115894272000000000
41 != 33452526613163807108170062053440751665152000000000
42 != 1405006117752879898543142606244511569936384000000000
43 != 60415263063373835637355132068513997507264512000000000
44 != 2658271574788448768043625811014615890319638528000000000
45 != 119622220865480194561963161495657715064383733760000000000
46 != 5502622159812088949850305428800254892961651752960000000000
47 != 258623241511168180642964355153611979969197632389120000000000
48 != 12413915592536072670862289047373375038521486354677760000000000
49 != 608281864034267560872252163321295376887552831379210240000000000
50 != 30414093201713378043612608166064768844377641568960512000000000000
51 != 1551118753287382280224243016469303211063259720016986112000000000000
52 != 80658175170943878571660636856403766975289505440883277824000000000000
53 != 4274883284060025564298013753389399649690343788366813724672000000000000
54 != 230843697339241380472092742683027581083278564571807941132288000000000000
55 != 12696403353658275925965100847566516959580321051449436762275840000000000000
56 != 710998587804863451854045647463724949736497978881168458687447040000000000000
57 != 40526919504877216755680601905432322134980384796226602145184481280000000000000
58 != 2350561331282878571829474910515074683828862318181142924420699914240000000000000
59 != 138683118545689835737939019720389406345902876772687432540821294940160000000000000
60 != 8320987112741390144276341183223364380754172606361245952449277696409600000000000000
61 != 507580213877224798800856812176625227226004528988036003099405939480985600000000000000
62 != 31469973260387937525653122354950764088012280797258232192163168247821107200000000000000
63 != 1982608315404440064116146708361898137544773690227268628106279599612729753600000000000000
64 != 126886932185884164103433389335161480802865516174545192198801894375214704230400000000000000
65 != 8247650592082470666723170306785496252186258551345437492922123134388955774976000000000000000
66 != 544344939077443064003729240247842752644293064388798874532860126869671081148416000000000000000
67 != 36471110918188685288249859096605464427167635314049524593701628500267962436943872000000000000000
68 != 2480035542436830599600990418569171581047399201355367672371710738018221445712183296000000000000000
69 != 171122452428141311372468338881272839092270544893520369393648040923257279754140647424000000000000000
70 != 11978571669969891796072783721689098736458938142546425857555362864628009582789845319680000000000000000
71 != 850478588567862317521167644239926010288584608120796235886430763388588680378079017697280000000000000000
72 != 61234458376886086861524070385274672740778091784697328983823014963978384987221689274204160000000000000000
73 != 4470115461512684340891257138125051110076800700282905015819080092370422104067183317016903680000000000000000
74 != 330788544151938641225953028221253782145683251820934971170611926835411235700971565459250872320000000000000000
75 != 24809140811395398091946477116594033660926243886570122837795894512655842677572867409443815424000000000000000000
76 != 1885494701666050254987932260861146558230394535379329335672487982961844043495537923117729972224000000000000000000
77 != 145183092028285869634070784086308284983740379224208358846781574688061991349156420080065207861248000000000000000000
78 != 11324281178206297831457521158732046228731749579488251990048962825668835325234200766245086213177344000000000000000000
79 != 894618213078297528685144171539831652069808216779571907213868063227837990693501860533361810841010176000000000000000000
80 != 71569457046263802294811533723186532165584657342365752577109445058227039255480148842668944867280814080000000000000000000
81 != 5797126020747367985879734231578109105412357244731625958745865049716390179693892056256184534249745940480000000000000000000
82 != 475364333701284174842138206989404946643813294067993328617160934076743994734899148613007131808479167119360000000000000000000
83 != 39455239697206586511897471180120610571436503407643446275224357528369751562996629334879591940103770870906880000000000000000000
84 != 3314240134565353266999387579130131288000666286242049487118846032383059131291716864129885722968716753156177920000000000000000000
85 != 281710411438055027694947944226061159480056634330574206405101912752560026159795933451040286452340924018275123200000000000000000000
86 != 24227095383672732381765523203441259715284870552429381750838764496720162249742450276789464634901319465571660595200000000000000000000
87 != 2107757298379527717213600518699389595229783738061356212322972511214654115727593174080683423236414793504734471782400000000000000000000
88 != 185482642257398439114796845645546284380220968949399346684421580986889562184028199319100141244804501828416633516851200000000000000000000
89 != 16507955160908461081216919262453619309839666236496541854913520707833171034378509739399912570787600662729080382999756800000000000000000000
90 != 1485715964481761497309522733620825737885569961284688766942216863704985393094065876545992131370884059645617234469978112000000000000000000000
91 != 135200152767840296255166568759495142147586866476906677791741734597153670771559994765685283954750449427751168336768008192000000000000000000000
92 != 12438414054641307255475324325873553077577991715875414356840239582938137710983519518443046123837041347353107486982656753664000000000000000000000
93 != 1156772507081641574759205162306240436214753229576413535186142281213246807121467315215203289516844845303838996289387078090752000000000000000000000
94 != 108736615665674308027365285256786601004186803580182872307497374434045199869417927630229109214583415458560865651202385340530688000000000000000000000
95 != 10329978488239059262599702099394727095397746340117372869212250571234293987594703124871765375385424468563282236864226607350415360000000000000000000000
96 != 991677934870949689209571401541893801158183648651267795444376054838492222809091499987689476037000748982075094738965754305639874560000000000000000000000
97 != 96192759682482119853328425949563698712343813919172976158104477319333745612481875498805879175589072651261284189679678167647067832320000000000000000000000
98 != 9426890448883247745626185743057242473809693764078951663494238777294707070023223798882976159207729119823605850588608460429412647567360000000000000000000000
99 != 933262154439441526816992388562667004907159682643816214685929638952175999932299156089414639761565182862536979208272237582511852109168640000000000000000000000
100 != 93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000

Process finished with exit code 0