Question

如何用递归求前100的和？用java代码写？

Answer 1

public class fun {
public static int f(int begin, int end)
{
if(begin>end)
return 0;
else
return begin + f(begin+1,end);
}
public static void main(String[] args)
{
System.out.println(f(0,100));
}
}

Answer 2

public class Test{
public static void main(String[] args) {
int sum = sum(100);
System.out.println(sum);
}
private static int sum(int i) {
int sum = 0;
if (i!=0) {
sum+= i+sum(--i);
}
return sum;
}
}