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public class My05 {
public static void main(String[] args) {
System.out.println("最终结果:"+sum(20));
}
public static int sum(int s)
{
if(s==1)
{
return mum(1);
}
return mum(s)+sum(s-1);
}
public static int mum(int n)
{
if(n==1)
{
return 1;
}
return n*mum(n-1);
}
}
public static void main(String[] args) {
int sum = 0;
for(int i =1;i<=20;i++){
sum += jc(i);
}
System.out.println(sum);
}
public static int jc(int n){
int value = 1;
String t = "";
for(int i=1;i<=n;i++){
value *= i;
t += i + "*";
}
System.out.println(t);
return value;
}
/**
*
*
* @author puruidong
* @version 2015.06.01
*
*/
public class Main{
private static void sum (long number){
System.out.println(((1+number)*number)/2);
}
public static void main(String[] args) {
sum(20);
sum(50);
sum(100);
}
}