Page 593 - Computer science 868 Class 12
P. 593
Program 10 Spiral Matrix
Define a class Spiral to generate a clock wise spiral matrix of size s. The details of the class
are as follows:
Class Name : Spiral
Data Members
a[][] : to store array
s: : to store number
Member Functions
Spiral(int s1) : to initialise s=s1
void generate() : to generate spiral matrix
void display() : to display the array
1 import java.util.*;
2 class Spiral
3 { int a[][],s;
4 Spiral(int s1)
5 {s=s1;
6 a=new int[s][s];
7 }
8 void generate()
9 { int up=0,le=0,dn=s-1,rt=s-1,c=1,i;
10 while(c<=s*s)
11 { for(i=le;i<=rt;i++) //top row
12 { a[up][i]=c++;
13 if(c>s*s) break;
14 }
15 for(i=up+1;i<=dn;i++) //right column
16 { a[i][rt]=c++;
17 if(c>s*s) break;
18 }
19 for(i=rt-1;i>=le;i--) // bottom row
20 { a[dn][i]=c++;
21 if(c>s*s) break;
22 }
23 for(i=dn-1;i>=up+1;i--) //left column
24 { a[i][up]=c++;
25 if(c>s*s) break;
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Internal Assessment 591

