Question

java编程， 怎么编程算1！+2！+3！+4！+5！

Answer 1

static int fac(int n) {

int fa;
if (n == 0)
fa = 1;
else
fa = n * fac(n - 1); // 递归引用自身
return fa;
}

public static int getSum(int n) {
int sum;
if(n==0)
sum=0;
else
sum=fac(n)+getSum(n-1);
return sum;
}

public static void main(String[] args) {
System.out.println("1!+2!+3!+4!+5!=" +getSum(5) );
}