[Introduction to programming in Java 笔记] 1.3.9 Factoring integers 素因子分解

素数 A prime is an integer greater than one whose only positive divisors are one and itself.
整数的素因子分解是乘积等于此素数的集合。
例如：3757208 = 2*2*2*7*13*13*397

public class Factors
{
public static void main(String[] args)
{ // Print the prime factors of N.
long N = Long.parseLong(args[0]);
long n = N;
for (long i = 2; i <= n/i; i++)
{ // Cast out and print i factors
while(n % i == 0)
{
n /= i;
System.out.print(i + " ");
// Any factors of n are greater than i.
}
}
if (n > 1) System.out.print(n);
System.out.println();
}
}

没看懂...