public static void Main(string[] args) { System.Console.WriteLine("Hello workd"); int ch = 0; do { Console.WriteLine("1. Exit"); Console.WriteLine("2. Positive and Negative number"); Console.WriteLine("3. Even and Odd number"); Console.WriteLine("4. Sum of first N natural numbers"); Console.WriteLine("5. Sum of Number in range"); Console.WriteLine("6. Greatest of two numbers"); Console.WriteLine("7. Greatest of Three numbers"); Console.WriteLine("8. Prime number"); Console.WriteLine("9. Prime Number in range.."); Console.WriteLine("10. Sum of Digits.."); Console.WriteLine("11. Reverse of Number."); Console.WriteLine("12. Palindrome checker.."); Console.WriteLine("13. Check Palindrome for number."); Console.WriteLine("14. Armstrong Number.."); Console.WriteLine("15. Armstrong Number within range.."); Console.WriteLine("16. Fibonacci Series.."); Console.WriteLine("17. Factorial of Number."); Console.WriteLine("18. Factors of number."); Console.WriteLine("19. Strong Number or not."); Console.WriteLine("20. Power of Number."); Console.WriteLine("21. Perfect Number.."); Console.WriteLine("22. Automorphic Number.."); Console.WriteLine("23. Harshad Number.."); Console.WriteLine("24. Abundant Number.."); Console.WriteLine("25. Friendly pair.."); Console.WriteLine("26. Gcd Or Hcf"); Console.WriteLine("27. Gcd Or Hcf using euclidean"); Console.WriteLine("28. LCM of 2 Numbers.."); Console.WriteLine("29. Binary to Decimal.."); Console.WriteLine("30. Binary to Octal.."); Console.WriteLine("31. Decimal To Binary.."); Console.WriteLine("32. Decimal To Octal.."); Console.WriteLine("33. Octal To Binary.."); Console.WriteLine("34. Octal to Decimal.."); Console.WriteLine("35. Quadrant In Coordinates.."); Console.WriteLine("36. Permutation of Classroom.."); Console.WriteLine("37. Handshake Program.."); Console.WriteLine("38. Addition of Two fractions.."); Console.WriteLine("39. Replace Zero with One's.."); Console.WriteLine("40. Expressed Sum of Two Prime Number.."); Console.WriteLine("41. Check Vowel"); Console.WriteLine("42. CharacterIsAlphabetOrNot"); Console.WriteLine("43. Area of circle"); Console.WriteLine("44. ASCII value of character.."); Console.WriteLine("45. Prime number in a range.."); Console.WriteLine("46. Print Plus and minus."); Console.WriteLine("47. Replace string with underscore"); Console.WriteLine("48. Find digits in integer."); Console.WriteLine("49. Number of days in month of year."); Console.WriteLine("50. Convert Number to words."); Console.WriteLine("51. ExactlyXDivisors."); Console.WriteLine("52. Square Root Of QuadraticEquation"); Console.WriteLine("53. Smallest Number in Array."); Console.WriteLine("54. Second Smallest Number in Array."); Console.WriteLine("55. Largest Number in array."); Console.WriteLine("56. Largest and Smallest number in Array."); Console.WriteLine("57. Sum of elements in array."); Console.WriteLine("58. Reverse the array."); Console.WriteLine("59. Sort Arrays in Half Parts."); Console.WriteLine("60. Sorting of an Array."); Console.WriteLine("61. Frequency of numbes in array."); Console.WriteLine("62. Longest Palindrome in array."); Console.WriteLine("63. Distinct elements in array"); Console.WriteLine("64. Repeating numbers in array."); Console.WriteLine("65. Non Repeating numbers in array."); Console.WriteLine("66. Removing duplicates elements from array."); Console.WriteLine("67. Minimum scalar product of two arrays."); Console.WriteLine("68. Maximum scalar product of two arrays."); Console.WriteLine("69. Count of even and odd number."); Console.WriteLine("70. Find all symmetric elements in array."); Console.WriteLine("71. Max Product of Sub array."); Console.WriteLine("72. To find arrays are disjoint or not."); Console.WriteLine("73. Determine whether array is subset of other array."); Console.WriteLine("74. Check If All The Numbers Of Arrays Can Be Made Equal."); Console.WriteLine("75. The sum of minimum absolute difference of the given array"); Console.WriteLine("76. Sort An Array According To Order Defined By Other Array"); Console.WriteLine("77. Replace each element by its rank in the given array"); Console.WriteLine("78. Equilibrium Index."); Console.WriteLine("79. Rotating array towards left."); Console.WriteLine("80. Rotating array towards right."); Console.WriteLine("81. Length of String."); Console.WriteLine("82. Toggle each character in string."); Console.WriteLine("83. Number of vowels in string."); Console.WriteLine("84. Remove vowels from string."); Console.WriteLine("85. Check string palindrome or not."); Console.WriteLine("86. Replace substring in string."); Console.WriteLine("87. Reverse the string."); Console.WriteLine("88. Remove Char Except Alphabet."); Console.WriteLine("89. Remove space from string."); Console.WriteLine("90. Replace brackets from expression."); Console.WriteLine("91. Sum Of Numbers Of String"); Console.WriteLine("92. Capitialize first and last letter of word in string."); Console.WriteLine("93. Frequency of character in string."); Console.WriteLine("94. Non repeating characters in string"); Console.WriteLine("95. Strings are anagram or not."); Console.WriteLine("96. Replace Old String In A String"); Console.WriteLine("97. Union of 2 arrays"); Console.WriteLine("98. Addition of 2 Matrix"); Console.WriteLine("99. Bubble sort."); ch = Convert.ToInt32(Console.ReadLine()); switch (ch) { case 2: Utility.PostiveAndNegativeNumber(); break; case 3: Utility.EvenOddNumber(); break; case 4: Utility.SumOfFirstNNaturalNumber(); break; case 5: Utility.SumOfNumbersInRange(); break; case 6: Utility.GreatestOfTwoNumber(); break; case 7: Utility.GreatestOfThreeNumber(); break; case 8: Utility.PrimeNumber(); break; case 9: Utility.PrimeNumberInRange(); break; case 10: Utility.SumOfDigitsOfANumber(); break; case 11: Utility.ReverseOfANumber(); break; case 12: Utility.CheckPalindrome(); break; case 13: Utility.CheckPalindromeForNumber(); break; case 14: Utility.ArmstrongNumber(); break; case 15: Utility.ArmstrongNumberWithinRange(); break; case 16: Utility.FibonacciSeries(); break; case 17: Utility.FactorialOfNumber(10); break; case 18: Utility.FactorsOfNumber(); break; case 19: Utility.StrongNumber(); break; case 20: Utility.PoweroFNumber(); break; case 21: Utility.PerfectNumber(); break; case 22: Utility.AuthomorphicNumber(); break; case 23: Utility.HarshadNumber(); break; case 24: Utility.AbdundantNumber(); break; case 25: Utility.FriendlyPair(); break; case 26: Utility.GcdOrHcf(); break; case 27: Utility.EuclideanAlgorithm(5, 10); break; case 28: Utility.LcmFor(4, 2); break; case 29: Utility.BinaryToDecimal(); break; case 30: Utility.BinaryToOctal(); break; case 31: Utility.DecimalToBinary(); break; case 32: Utility.DecimalToOctal(); break; case 33: Utility.OctalToBinary(); break; case 34: Utility.OctalToDecimail(); break; case 35: Utility.QuadrantInCoordinates(); break; case 36: Utility.PermutationInClassroom(); break; case 37: Utility.HandShakeProgram(); break; case 38: Utility.AdditionOfTwoFraction(); break; case 39: Utility.Replace0With1v2(); break; case 40: Utility.ExpressedAsSumOfTwoPrimeNumber(); break; case 41: Utility.CheckVowel(); break; case 42: Utility.CharacterIsAlphabetOrNot(); break; case 43: Utility.AreaOfCircle(); break; case 44: Utility.ASCIIValueOfCharacter(); break; case 45: Utility.PrimeNumberBetweenMinAndMax(); break; case 46: Utility.PrintPlusAndMinus(); break; case 47: Utility.ReplaceStringWithUnderScore(); break; case 48: Utility.NumberOfDigitsInAnInteger(); break; case 49: Utility.ProgramOfNumberOfDays(); break; case 50: Utility.ConvertNumberToWords(); break; case 51: Utility.ExactlyXDivisors(); break; case 52: Utility.SquareRootOfQuadraticEquation(); break; case 53: Utility.SmallestNumberInArray(); break; case 54: Utility.SecondSmallestNumberInArray(); break; case 55: Utility.LargestNumberInArray(); break; case 56: Utility.LargestAndSmallestNumberInArray(); break; case 57: Utility.SumOfElementsInArray(); break; case 58: Utility.ReverseTheArray(); break; case 59: Utility.SortArrayInHalfParts(); break; case 60: Utility.SortingOfArray(); break; case 61: Utility.FrequencyOfElementsInArray(); break; case 62: Utility.LongestPalindromeInArray(); break; case 63: Utility.DistinctElementInArray(); break; case 64: Utility.RepeatingElementsInArray(); break; case 65: Utility.NonRepeatingElementsInArray(); break; case 66: Utility.RemovingDuplicateElementsInArray(); break; case 67: Utility.MinimumScalarProductOfTwoArray(); break; case 68: Utility.MaximumScalarProductOfTwoNumber(); break; case 69: Utility.CountOfEvenAndOddNumberInArray(); break; case 70: Utility.SymmetricPairInArray(); break; case 71: Utility.MaximumProductOfSubArray(); break; case 72: Utility.DisjointArray(); break; case 73: Utility.DetermineTheArrayIsSubsetOfAnotherArray(); break; case 74: Utility.CheckIfAllTheNumbersOfArraysCanBeMadeEqual(); break; case 75: Utility.FindingMinimumSumOfAbsoluteDifferenceOfGivenArray(); break; case 76: Utility.SortAnArrayAccordingToOrderDefinedByOtherArray(); break; case 77: Utility.ReplaceEachElementByItsRankInTheGivenArray(); break; case 78: Utility.EquilibriumIndex(); break; case 79: Utility.RotatingArrayTowardsLeft(); break; case 80: Utility.RotatingArrayTowardsRight(); break; case 81: Utility.FindStringLength(); break; case 82: Utility.ToggleEachCharacterInString(); break; case 83: Utility.CountOfVowels(); break; case 84: Utility.RemoveVowelsFromString(); break; case 85: Utility.CheckStringPalindromeOrNote(); break; case 86: Utility.ReplaceSubStringInString(); break; case 87: Utility.ReverseTheString(); break; case 88: Utility.RemoveCharExceptAlphabet(); break; case 89: Utility.RemoveSpaceFromString(); break; case 90: Utility.ReplaceBracketsFromExpression(); break; case 91: Utility.SumOfNumbersOfString(); break; case 92: Utility.CapitalizeFirstAndLastLetterOfEachWordOfString(); break; case 93: Utility.FrequencyOfCharacterInString(); break; case 94: Utility.NonRepeatingCharacterInString(); break; case 95: Utility.StringsAreAnagramOrNot(); break; case 96: Utility.ReplaceOldStringInAString(); break; case 97: Utility.SetOperation(); break; case 98: Utility.AdditionOf2DArray(); break; case 99: Utility.BubbleSort(); break; case 100: Utility.SelectionSort(); break; } }while (ch != 1); }