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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
 
typedef unsigned char uint8;
typedef unsigned short uint16;
#if UINT_MAX >= 0xFFFFFFFF
typedef unsigned uint32;
#else
typedef unsigned long uint32;
#endif
typedef unsigned uint;
 
void MulInPlace(uint8* dst/* n bytes */,
                const uint8* src/* n bytes */,
                uint n)
{
  uint c1, c2;
 
  if (n >= 0xFFFF) abort();
 
  for (c1 = n - 1; c1 != ~0u; c1--)
  {
    uint16 s = 0;
    uint32 p = 0; // p must be able to store ceil(log2(n))+2*8 bits
 
    for (c2 = c1; c2 != ~0u; c2--)
    {
      p += dst[c2] * src[c1 - c2];
    }
 
    dst[c1] = (uint8)(p & 0xFF);
 
    for (c2 = c1 + 1; c2 < n; c2++)
    {
      p >>= 8;
      s += dst[c2] + (uint8)(p & 0xFF);
      dst[c2] = (uint8)(s & 0xFF);
      s >>= 8;
    }
  }
}
 
int ByteDivInPlace(uint8* dst/* n bytes */,
                   uint   n,
                   uint8  divisor,
                   uint8* remainder)
{
  uint rem = 0;
  int nonzero = 0;
 
  while (n)
  {
    rem += dst[n - 1];
    nonzero |= (dst[n - 1] = rem / divisor);
    rem = (rem % divisor) << 8;
    n--;
  }
 
  if (remainder != NULL)
    *remainder = (uint8)(rem >> 8);
 
  return nonzero; // 1 if the quotient is non-zero, 0 otherwise
}
 
void IncInPlace(uint8* dst/* n bytes */,
                uint n)
{
  uint c = 1;
  while (n-- && c)
  {
    c += *dst;
    *dst++ = c & 0xFF;
    c >>= 8;
  }
}
 
void DestroyingDecimalPrint(uint8* dst, uint n)
{
  uint8 r;
  if (ByteDivInPlace(dst, n, 10, &r))
    DestroyingDecimalPrint(dst, n);
  printf("%d", r);
}
 
int main(void)
{
  int i;
  uint8 factorial[66];
  uint8 factor[sizeof(factorial)];
  uint8 tmp[sizeof(factorial)];
 
  // factor = 1
  memset(factor, 0, sizeof(factor));
  factor[0] = 1;
 
  // factorial = 1
  memcpy(factorial, factor, sizeof(factorial));
 
  for (i = 1; i <= 100; i++)
  {
    // factorial *= factor
    MulInPlace(factorial, factor, sizeof(factorial));
 
    // tmp = factorial
    memcpy(tmp, factorial, sizeof(factorial));
 
    // print i and tmp
    printf("%i! = ", i);
    DestroyingDecimalPrint(tmp, sizeof(tmp));
    printf("\n");
 
    // factor += 1
    IncInPlace(factor, sizeof(factor));
  }
 
  return 0;
}
 

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• # 1:   hide show   clone   input   222 days 16 hours ago    Success

  result: Success     time: 0.03s    memory: 1676 kB     returned value: 0

  input: no
  output:

  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