Top 50 Pattern Programming Questions (Fresher to Experienced)

Basic Star Patterns

1. Square Star Pattern

* * * *
* * * *
* * * *
* * * *

2. Right Triangle Star Pattern

*
* *
* * *
* * * *

3. Inverted Right Triangle

* * * *
* * *
* *
*

4. Left Triangle Pattern

      *
    * *
  * * *
* * * *

5. Pyramid Pattern

      *
    * * *
  * * * * *
* * * * * * *

6. Inverted Pyramid

* * * * * * *
  * * * * *
    * * *
      *

7. Diamond Pattern

    *
   ***
  *****
   ***
    *

8. Hollow Square Pattern

* * * *
*     *
*     *
* * * *

9. Hollow Triangle Pattern

10. Hollow Pyramid Pattern

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Number Patterns

11. Number Square Pattern

1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4

12. Increasing Number Triangle

1
1 2
1 2 3
1 2 3 4

13. Floyd’s Triangle

1
2 3
4 5 6
7 8 9 10

14. Pascal Triangle

15. Reverse Number Triangle

1 2 3 4
1 2 3
1 2
1

16. Continuous Number Pattern

1
2 3
4 5 6
7 8 9 10

17. Palindrome Number Pattern

1
121
12321
1234321

18. Zig-Zag Number Pattern

19. Snake Number Pattern

20. Spiral Matrix Pattern

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Alphabet Patterns

21. Alphabet Square Pattern

A B C D
A B C D
A B C D
A B C D

22. Alphabet Triangle Pattern

A
A B
A B C
A B C D

23. Continuous Alphabet Pattern

A
B C
D E F

24. Reverse Alphabet Pattern

25. Alphabet Pyramid Pattern

26. Palindrome Alphabet Pattern

A
ABA
ABCBA
ABCDCBA

27. Character Diamond Pattern

28. Hollow Alphabet Pyramid

29. Alternate Alphabet Pattern

30. Alphabet Hourglass Pattern

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Advanced Star Patterns

31. Butterfly Pattern

*      *
**    **
***  ***
********
***  ***
**    **
*      *

32. Sandglass Pattern

33. Hourglass Star Pattern

34. X Pattern

*     *
 *   *
  * *
 *   *
*     *

35. Plus Pattern

36. Hollow Diamond Pattern

37. Hollow Butterfly Pattern

38. Rhombus Pattern

39. Hollow Rhombus Pattern

40. Double Pyramid Pattern

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Matrix & Logic-Based Patterns

41. Spiral Star Pattern

42. Spiral Number Pattern

43. Concentric Square Pattern

Example:

4 4 4 4 4 4 4
4 3 3 3 3 3 4
4 3 2 2 2 3 4
4 3 2 1 2 3 4
4 3 2 2 2 3 4
4 3 3 3 3 3 4
4 4 4 4 4 4 4

44. Binary Pattern

1
0 1
1 0 1
0 1 0 1

45. Checkerboard Pattern

46. Diagonal Matrix Pattern

47. Border Element Pattern

48. Wave Matrix Pattern

49. Spiral Boundary Traversal Pattern

50. Hollow Concentric Pattern

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Common Interview Follow-Up Questions

Interviewers also ask:

• Optimize nested loops
• Reduce space complexity
• Print without using extra arrays
• Convert pattern to recursion
• Use only one loop
• Print patterns dynamically for any n
• Dry run the code manually

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Most Important Patterns for Interviews

If you want to prepare quickly, focus on these first:

1. Pyramid Pattern
2. Diamond Pattern
3. Butterfly Pattern
4. Pascal Triangle
5. Floyd Triangle
6. Hollow Square
7. Spiral Matrix
8. Concentric Square
9. Palindrome Pattern
10. X and Hourglass Patterns

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Tips to Solve Any Pattern

1. Understand rows and columns
2. Observe spaces carefully
3. Divide pattern into sections
4. Use nested loops properly
5. Dry run for n = 5
6. Practice symmetry patterns daily

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Recommended Practice Order

Beginner

• Square
• Triangle
• Number patterns
• Alphabet patterns

Intermediate

• Pyramid
• Diamond
• Hollow patterns
• Butterfly

Advanced

• Spiral matrix
• Concentric square
• Pascal triangle
• Zig-zag patterns

This was part of Interview Preparation With Bipin — Let’s Crack It!