The JSP code implements the pyramid of inversion example

Implement the pyramid shown in the figure in the JSP,

< img border = 0 SRC = "/ / files.jb51.net/file_images/article/201402/2014225162852024.jpg" >

The code is as follows:

The general idea is as follows:

1. Draw the first 5 lines. Because I + Spaces = total number of lines, so the number of Spaces in the first row is the total number of lines - I (line number), and then I draw *, the number of * =2 times I -11;

2. Draw the remaining four lines. Because the number of Spaces = the number of rows I, the number of * =(total rows - I)*2+1

<% 
                for(int i=1;i<6;i++){ 
        for(int j=0;j<5-i;j++){ 
            str +=" ";  
        } 
        for(int j=0;j<2*i-1;j++){ 
            str +="*"; 
        } 
        str += "<br>"; 
    } 
    for(int i=1;i<5;i++){ 
        for(int j=1;j<i+1;j++){ 
            str +="&"; 
        } 
        for(int k=0;k<2*(4-i)+1;k++){ 
            str +="*"; 
        } 
        str += "<br>"; 
    } 
%> 
<%=str%>