参考代码:
import java.math.BigInteger; import java.util.Scanner; public class Main{ public static void main(String[] args) { // 问就是BigInteger Scanner sc = new Scanner(System.in); int n = sc.nextInt(); BigInteger sum = BigInteger.valueOf(1); for (int i = 1; i <= n; i++) { sum = sum.multiply(BigInteger.valueOf(i)); } String str = sum + ""; for (int i = str.length()-1; i >= 0; i--) { if(str.charAt(i) != '0') { System.out.println(str.charAt(i)); break; } } } }
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