Print perfect square spiral number pattern<pre>1 2 3 4 5 620 21

Programming Example

Print perfect square spiral number pattern

1    2    3    4    5    620   21   22   23   24   719   32   33   34   25   818   31   36   35   26   917   30   29   28   27   1016   15   14   13   12   11

👁 1,899 Views

💻 Practical Program

📘 Step by Step Learning

Write a C program to print the perfect square number pattern series using for loop. How to print perfect square number pattern using for loop in C programming.

Information & Algorithm


1    2    3    4    5    6    7    8    9    10
36   37   38   39   40   41   42   43   44   11
35   64   65   66   67   68   69   70   45   12
34   63   84   85   86   87   88   71   46   13
33   62   83   96   97   98   89   72   47   14
32   61   82   95   100  99   90   73   48   15
31   60   81   94   93   92   91   74   49   16
30   59   80   79   78   77   76   75   50   17
29   58   57   56   55   54   53   52   51   18
28   27   26   25   24   23   22   21   20   19

Program Code

/**
 * C program to print perfect square number pattern
 */

#include <stdio.h>

#define SIZE 6 // Size is always even

int main()
{
    int i, j, N;
    int board[SIZE][SIZE];
    int left, top;

    left = 0;
    top  = SIZE - 1;
    N    = 1;

    for(i=1; i<=SIZE/2; i++, left++, top--)
    {
        // Fill from left to right
        for(j=left; j<=top; j++, N++)
        {
            board[left][j] = N;
        }

        // Fill from top to down
        for(j=left+1; j<=top; j++, N++)
        {
            board[j][top] = N;
        }

        // Fill from right to left
        for(j=top-1; j>=left; j--, N++)
        {
            board[top][j] = N;
        }

        // Fill from down to top
        for(j=top-1; j>=left+1; j--, N++)
        {
            board[j][left] = N;
        }
    }

    // Print the pattern
    for(i=0; i<SIZE; i++)
    {
        for(j=0; j<SIZE; j++)
        {
            printf("%-5d", board[i][j]);
        }
        printf("\n");
    }

    return 0;
}

Output

1    2    3    4    5    6    7    8    9    10
36   37   38   39   40   41   42   43   44   11
35   64   65   66   67   68   69   70   45   12
34   63   84   85   86   87   88   71   46   13
33   62   83   96   97   98   89   72   47   14
32   61   82   95   100  99   90   73   48   15
31   60   81   94   93   92   91   74   49   16
30   59   80   79   78   77   76   75   50   17
29   58   57   56   55   54   53   52   51   18
28   27   26   25   24   23   22   21   20   19

Explanation

Required knowledge:

Basic C programming , Loop , Array

Note: If you want to generate the perfect square of any number other than 10. Then you only need to change this line #define SIZE 10 to any other integer.

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.

Print perfect square spiral number pattern
1 2 3 4 5 620 21 22 23 24 719 32 33 34 25 818 31 36 35 26 917 30 29 28 27 1016 15 14 13 12 11

Information & Algorithm

Program Code

Output

Explanation

How to learn from this program

Practice suggestion

Quick Practice Flow

Related Programs

Print perfect square spiral number pattern1 2 3 4 5 620 21 22 23 24 719 32 33 34 25 818 31 36 35 26 917 30 29 28 27 1016 15 14 13 12 11

Information & Algorithm

Program Code

Output

Explanation

How to learn from this program

Practice suggestion

Quick Practice Flow

Related Programs

Print perfect square spiral number pattern
1 2 3 4 5 620 21 22 23 24 719 32 33 34 25 818 31 36 35 26 917 30 29 28 27 1016 15 14 13 12 11