Question

JAVA用FOR循环写N的阶乘，和用递归写N的阶乘

JAVA用FOR循环写N的阶乘，和用递归写N的阶乘

Answer 1

class jiecheng1{
long jisuan(long x){
if(x>=0){
if (x==0)
return 1;
else if (x==1)
return 1;
else
return x*(jisuan(x-1));}
else return -1;
}
}
class jiecheng2{
public static void main(String[] args){
jiecheng1 aa=new jiecheng1();
System.out.println(aa.jisuan(2));
}
}

Answer 2

int s=1;
for(int i =0;i<n;i++){
s*=(i+1);
}

int a(n){
if(n==1)
return 1;
else
return n*a(n-1);
}