递归计算数的阶层

引用
public int f(int n){
		int m = 0;
		if(n>1){
			m = n*f(n-1);
		}else if(n == 1){
			m = 1;
		}else{
			System.out.println("请数据正确的整数");
		}
		return m;
	}