计算1000的阶乘

1.使用Java自带类BigInteger

import java.math.BigInteger;public class no50_duplicate {public static void main(String[] args) {int N = 1000;BigInteger res = new BigInteger("1");for (int i = 1; i <= N; i++) {res = res.multiply(BigInteger.valueOf(i));}System.out.println(res);}
}

2.自己设计完成

转换成字符串，然后将字符串转换为整型数组，逐位计算，结果转换为字符串再返回。

import java.util.ArrayList;public class no50_duplicate {public static void main(String[] args) {int N = 1000;String res = "1";for (int i = 1; i <= N; i++) {res = factorial(i, res);}System.out.println(res);}public static String factorial(int n, String str) {int[] arr = str2int(str);ArrayList<Integer> list = new ArrayList<>();int carry = 0;for (int i = 0; i < arr.length; i++) {int temp = n * arr[i] + carry;list.add(temp % 10);carry = temp / 10;}if (carry != 0) {list.add(carry);}StringBuilder sb = new StringBuilder();for (int i = list.size() - 1; i >= 0; i--) {sb.append(list.get(i));}return sb.toString().trim();}private static int[] str2int(String str) {char[] chars = str.toCharArray();int[] arr = new int[chars.length];for (int i = 0; i < chars.length; i++) {arr[i] = chars[chars.length - i - 1] - '0';}return arr;}
}

计算结果：

402387260077093773543702433923003985719374864210714632543799910429938512398629020592044208486969404800479988610197196058631666872994808558901323829669944590997424504087073759918823627727188732519779505950995276120874975462497043601418278094646496291056393887437886487337119181045825783647849977012476632889835955735432513185323958463075557409114262417474349347553428646576611667797396668820291207379143853719588249808126867838374559731746136085379534524221586593201928090878297308431392844403281231558611036976801357304216168747609675871348312025478589320767169132448426236131412508780208000261683151027341827977704784635868170164365024153691398281264810213092761244896359928705114964975419909342221566832572080821333186116811553615836546984046708975602900950537616475847728421889679646244945160765353408198901385442487984959953319101723355556602139450399736280750137837615307127761926849034352625200015888535147331611702103968175921510907788019393178114194545257223865541461062892187960223838971476088506276862967146674697562911234082439208160153780889893964518263243671616762179168909779911903754031274622289988005195444414282012187361745992642956581746628302955570299024324153181617210465832036786906117260158783520751516284225540265170483304226143974286933061690897968482590125458327168226458066526769958652682272807075781391858178889652208164348344825993266043367660176999612831860788386150279465955131156552036093988180612138558600301435694527224206344631797460594682573103790084024432438465657245014402821885252470935190620929023136493273497565513958720559654228749774011413346962715422845862377387538230483865688976461927383814900140767310446640259899490222221765904339901886018566526485061799702356193897017860040811889729918311021171229845901641921068884387121855646124960798722908519296819372388642614839657382291123125024186649353143970137428531926649875337218940694281434118520158014123344828015051399694290153483077644569099073152433278288269864602789864321139083506217095002597389863554277196742822248757586765752344220207573630569498825087968928162753848863396909959826280956121450994871701244516461260379029309120889086942028510640182154399457156805941872748998094254742173582401063677404595741785160829230135358081840096996372524230560855903700624271243416909004153690105933983835777939410970027753472000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

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Java计算1000的阶乘

计算1000的阶乘

1.使用Java自带类BigInteger

2.自己设计完成

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