Program 340 : Chakravyuha or Spiral Pattern Program(Question Taken from Codevitae(TCS) 2017)

Program 340 : Chakravyuha or Spiral Pattern Program(Question Taken from Codevitae(TCS) 2017)
 

#include<stdio.h>
main()
{
 int i,j,a[100][100],size,row=0,col=0,boundaryStart=0,boundaryEnd,num,evenRowCol=0,evenRow=0,evenCol=0,count=1;
 printf("Enter number of rows\n");
 scanf("%d",&size);
 boundaryEnd=size-1;
   for(i=0;i<size;i++)
    {
     for(j=0;j<size;j++)
        a[i][j]=0;
    }
 while(count<=(size*size))
 {
  if(evenRowCol%2==0)
  {
   if(evenRow%2==0)
   {
       for(i=col;(i<=boundaryEnd) && (count<=size*size);i++){
         a[row][i]=count;
        count++;
       }
    evenRow++; 
    col=i-1;
       row++;
   }
   else
   {
    for(i=col;(i>=boundaryStart) && (count<=size*size);i--)
    {
         a[row][i]=count;
        count++;
       }
    evenRow++;
    col=i+1;
    row--;
    boundaryStart++;
   }
   evenRowCol++;
  }
  else
  {
   if(evenCol%2==0)
   {
    for(i=row;(i<=boundaryEnd) && (count<=size*size);i++)
    {
        a[i][col]=count;
         count++;
        } 
        row=i-1;
        col--;
        evenCol++;
   }
   else
   {
    for(i=row;(i>=boundaryStart) && (count<=size*size);i--)
    {
        a[i][col]=count;
         count++;
        } 
        row=i+1;
        col++;
        evenCol++;
        boundaryEnd--;
   }
   
   evenRowCol++;
  }
 }
    for(i=0;i<size;i++)
    {
     for(j=0;j<size;j++)
        printf("%3d ",a[i][j]);
        printf("\n");
    }
}

Explanation:

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Output: