jiecheng2.java

来自「java应用举例1」· Java 代码 · 共 8 行

public class JieCheng2 {
    public static long factorial(long x) {
	if (x < 0) throw new IllegalArgumentException("x must be >= 0");
        if (x <= 1) return 1;              
        else return x * factorial(x-1);    
    }
}