基础练习 Sine之舞

 1 import java.util.Scanner;  
 2       
 3     public class Main{   
 4         public static void main(String[] args) {
 5             Scanner input = new Scanner(System.in);
 6             int n;
 7             n = input.nextInt();
 8             String An="";
 9             String Sn="";
10             for(int i=1;i<=n;i++){
11                 if(i!=n)
12                     Sn = "("+Sn+An(i)+"+"+(n-i+1)+")";
13                 if(i==n)
14                     Sn = Sn+An(i)+"+"+(n-i+1);
15             }
16             System.out.println(Sn);
17         }
18         public static String An(int n){
19             String An = "";
20             char temp;
21             for(int i=n;i>=1;i--){
22                 if(i%2==0)
23                     temp = ‘+‘;
24                 else
25                     temp = ‘-‘;
26                 if(i!=n)
27                     An = "sin("+i+temp+An+")";
28                 if(i==n)
29                     An = "sin("+i+")";
30             }
31             return An;
32         }
33     
34  }