Practice 50 C# Array Programming Questions

Practice 50 C# Array Programming Questions

Q1. Write a C# program to find the largest element in an array.  
  Input: arr = [3, 1, 4, 1, 5]  
  Output: Largest element = 5

Q2. Write a C# program to find the smallest element in an array.  
  Input: arr = [3, 1, 4, 1, 5]  
  Output: Smallest element = 1

Q3. Write a C# program to find the sum of all elements in an array.  
  Input: arr = [1, 2, 3, 4]  
  Output: Sum = 10

Q4. Write a C# program to calculate the average of all elements in an array.  
  Input: arr = [1, 2, 3, 4, 5]  
  Output: Average = 3.0

Q5. Write a C# program to count the number of even numbers in an array.  
  Input: arr = [1, 2, 3, 4, 5]  
  Output: Even count = 2

Q6. Write a C# program to count the number of odd numbers in an array.  
  Input: arr = [1, 2, 3, 4, 5]  
  Output: Odd count = 3

Q7. Write a C# program to find the second largest element in an array.  
  Input: arr = [3, 1, 4, 5, 6]  
  Output: Second largest element = 5

Q8. Write a C# program to reverse an array.  
  Input: arr = [1, 2, 3, 4]  
  Output: Reversed array = [4, 3, 2, 1]

Q9. Write a C# program to find the frequency of a given element in an array.  
  Input: arr = [1, 2, 2, 3, 2], element = 2  
  Output: Frequency of 2 = 3

Q10. Write a C# program to check if an array contains a specific element.  
   Input: arr = [1, 2, 3, 4], element = 3  
   Output: Element found

Q11. Write a C# program to find the common elements between two arrays.  
   Input: arr1 = [1, 2, 3, 4], arr2 = [3, 4, 5, 6]  
   Output: Common elements = 3 4

Q12. Write a C# program to sort an array in ascending order.  
   Input: arr = [5, 3, 1, 4, 2]  
   Output: Sorted array = [1, 2, 3, 4, 5]

Q13. Write a C# program to sort an array in descending order.  
   Input: arr = [5, 3, 1, 4, 2]  
   Output: Sorted array = [5, 4, 3, 2, 1]

Q14. Write a C# program to find the sum of odd numbers in an array.  
   Input: arr = [1, 2, 3, 4, 5]  
   Output: Sum of odd numbers = 9

Q15. Write a C# program to find the sum of even numbers in an array.  
   Input: arr = [1, 2, 3, 4, 5]  
   Output: Sum of even numbers = 6

Q16. Write a C# program to remove duplicates from an array.  
   Input: arr = [1, 2, 2, 3, 4, 4]  
   Output: Array without duplicates = [1, 2, 3, 4]

Q17. Write a C# program to merge two arrays into one.  
   Input: arr1 = [1, 2, 3], arr2 = [4, 5, 6]  
   Output: Merged array = [1, 2, 3, 4, 5, 6]

Q18. Write a C# program to find the maximum product of two elements in an array.  
   Input: arr = [1, 2, 3, 4]  
   Output: Maximum product = 12

Q19. Write a C# program to check if an array is sorted in ascending order.  
   Input: arr = [1, 2, 3, 4]  
   Output: Array is sorted

Q20. Write a C# program to check if an array is sorted in descending order.  
   Input: arr = [4, 3, 2, 1]  
   Output: Array is sorted

Q21. Write a C# program to find the first non-repeated element in an array.  
   Input: arr = [1, 2, 2, 3, 4, 4]  
   Output: First non-repeated element = 1

Q22. Write a C# program to check if two arrays are equal.  
   Input: arr1 = [1, 2, 3], arr2 = [1, 2, 3]  
   Output: Arrays are equal

Q23. Write a C# program to rotate an array by one position to the left.  
   Input: arr = [1, 2, 3, 4]  
   Output: Rotated array = [2, 3, 4, 1]

Q24. Write a C# program to rotate an array by one position to the right.  
   Input: arr = [1, 2, 3, 4]  
   Output: Rotated array = [4, 1, 2, 3]

Q25. Write a C# program to find the intersection of two arrays.  
   Input: arr1 = [1, 2, 3, 4], arr2 = [3, 4, 5, 6]  
   Output: Intersection = [3, 4]

Q26. Write a C# program to find the union of two arrays.  
   Input: arr1 = [1, 2, 3], arr2 = [3, 4, 5]  
   Output: Union = [1, 2, 3, 4, 5]

Q27. Write a C# program to find the difference between two arrays.  
   Input: arr1 = [1, 2, 3], arr2 = [2, 3, 4]  
   Output: Difference = [1]

Q28. Write a C# program to copy all elements of one array to another array.  
   Input: arr1 = [1, 2, 3, 4]  
   Output: arr2 = [1, 2, 3, 4]

Q29. Write a C# program to find the largest sum of any subarray in an array.  
   Input: arr = [-2, 1, -3, 4, -1, 2, 1, -5, 4]  
   Output: Largest sum = 6

Q30. Write a C# program to check if an array contains only positive numbers.  
   Input: arr = [1, 2, 3, 4]  
   Output: Array contains only positive numbers

Q31. Write a C# program to find the minimum sum of any subarray in an array.  
   Input: arr = [1, 2, 3, -1, -2]  
   Output: Minimum sum = -3

Q32. Write a C# program to find the largest even number in an array.  
   Input: arr = [1, 2, 3, 4, 5]  
   Output: Largest even number = 4

Q33. Write a C# program to replace all negative numbers in an array with zero.  
   Input: arr = [-1, 2, -3, 4, -5]  
   Output: Modified array = [0, 2, 0, 4, 0]

Q34. Write a C# program to print all the unique elements in an array.  
   Input: arr = [1, 2, 2, 3, 4]  
   Output: Unique elements = 1 3 4

Q35. Write a C# program to find the most frequent element in an array.  
   Input: arr = [1, 2, 2, 3, 3, 3]  
   Output: Most frequent element = 3

Q36. Write a C# program to find the sum of positive numbers in an array.  
   Input: arr = [-1, 2, 3, -4, 5]  
   Output: Sum of positive numbers = 10

Q37. Write a C# program to check if an array contains only odd numbers.  
   Input: arr = [1, 3, 5]  
   Output: Array contains only odd numbers

Q38. Write a C# program to find the product of all elements in an array.  
   Input: arr = [1, 2, 3, 4]  
   Output: Product = 24

Q39. Write a C# program to find the first duplicate element in an array.  
   Input: arr = [1, 2, 3, 1, 4]  
   Output: First duplicate = 1

Q40. Write a C# program to remove a specific element from an array.  
   Input: arr = [1, 2, 3, 4], element = 3  
   Output: Array after removal = [1, 2, 4]

Q41. Write a C# program to find the difference between the largest and smallest element in an array.  
   Input: arr = [5, 2, 9, 1, 3]  
   Output: Difference = 8

Q42. Write a C# program to check if an array contains only even numbers.  
   Input: arr = [2, 4, 6, 8]  
   Output: Array contains only even numbers

Q43. Write a C# program to print the elements of an array in reverse order.  
   Input: arr = [1, 2, 3, 4]  
   Output: Reversed array = [4, 3, 2, 1]

Q44. Write a C# program to remove all even numbers from an array.  
   Input: arr = [1, 2, 3, 4, 5]  
   Output: Array after removing evens = [1, 3, 5]

Q45. Write a C# program to count the total number of elements in an array.  
   Input: arr = [1, 2, 3, 4, 5]  
   Output: Total count = 5

Q46. Write a C# program to find the median of an array.  
   Input: arr = [1, 3, 2]  
   Output: Median = 2

Q47. Write a C# program to find the mode (most frequent element) in an array.  
   Input: arr = [1, 2, 3, 3, 4]  
   Output: Mode = 3

Q48. Write a C# program to shift all zeros to the end of an array.  
   Input: arr = [1, 0, 2, 0, 3]  
   Output: Array after shifting zeros = [1, 2, 3, 0, 0]

Q49. Write a C# program to find the index of an element in an array.  
   Input: arr = [1, 2, 3, 4], element = 3  
   Output: Index of element = 2

Q50. Write a C# program to swap two elements in an array.  
   Input: arr = [1, 2, 3, 4], index1 = 0, index2 = 2  
   Output: Array after swapping = [3, 2, 1, 4]