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| 1 | +namespace Calculator; |
| 2 | + |
| 3 | +public class Calculator |
| 4 | +{ |
| 5 | + private string? FirstOperand { get; set; } |
| 6 | + |
| 7 | + private string? SecondOperand { get; set; } |
| 8 | + |
| 9 | + private string? Operator { get; set; } |
| 10 | + |
| 11 | + private string? SecondOperator { get; set; } |
| 12 | + |
| 13 | + public string? Text { get; private set; } |
| 14 | + |
| 15 | + public static bool IsOperator(string text) => text == "/" || text == "*" || text == "-" || text == "+" || text == "±" || text == "=" || text == "√" || text == "C" || text == "⌫"; |
| 16 | + |
| 17 | + public string? CalculateExpression(string[] expression) |
| 18 | + { |
| 19 | + for (int i = 0; i < expression.Length; i++) |
| 20 | + { |
| 21 | + if(!AddOperatorOrOperand(expression[i])) |
| 22 | + { |
| 23 | + GetValue(); |
| 24 | + } |
| 25 | + } |
| 26 | + return FirstOperand; |
| 27 | + } |
| 28 | + |
| 29 | + public string? GetValue() |
| 30 | + { |
| 31 | + if (FirstOperand == null || SecondOperand == null) |
| 32 | + { |
| 33 | + return FirstOperand; |
| 34 | + } |
| 35 | + |
| 36 | + float firstNumber = float.Parse(FirstOperand); |
| 37 | + float secondNumber = float.Parse(SecondOperand); |
| 38 | + switch (Operator) |
| 39 | + { |
| 40 | + case "+": |
| 41 | + { |
| 42 | + FirstOperand = (firstNumber + secondNumber).ToString(); |
| 43 | + break; |
| 44 | + } |
| 45 | + case "-": |
| 46 | + { |
| 47 | + FirstOperand = (firstNumber - secondNumber).ToString(); |
| 48 | + break; |
| 49 | + } |
| 50 | + case "*": |
| 51 | + { |
| 52 | + FirstOperand = (firstNumber * secondNumber).ToString(); |
| 53 | + break; |
| 54 | + } |
| 55 | + case "/": |
| 56 | + { |
| 57 | + if (Math.Abs(secondNumber - 0) < 0.000000000000000000000000000001) |
| 58 | + { |
| 59 | + FirstOperand = SecondOperand = Operator = SecondOperand = null; |
| 60 | + } |
| 61 | + break; |
| 62 | + } |
| 63 | + default: |
| 64 | + { |
| 65 | + return null; |
| 66 | + } |
| 67 | + } |
| 68 | + |
| 69 | + SecondOperand = null; |
| 70 | + Text = $"{FirstOperand} {SecondOperator} "; |
| 71 | + Operator = SecondOperator; |
| 72 | + return FirstOperand; |
| 73 | + } |
| 74 | + |
| 75 | + public bool AddOperatorOrOperand(string text) |
| 76 | + { |
| 77 | + if (text == "") |
| 78 | + { |
| 79 | + return true; |
| 80 | + } |
| 81 | + |
| 82 | + if (!IsOperator(text)) |
| 83 | + { |
| 84 | + if (text == ",") |
| 85 | + { |
| 86 | + if (Text!= null && Text.Contains(',') || FirstOperand == null) |
| 87 | + { |
| 88 | + return true; |
| 89 | + } |
| 90 | + } |
| 91 | + if (Operator == null) |
| 92 | + { |
| 93 | + FirstOperand += text; |
| 94 | + } |
| 95 | + else |
| 96 | + { |
| 97 | + SecondOperand += text; |
| 98 | + } |
| 99 | + |
| 100 | + Text += text; |
| 101 | + return true; |
| 102 | + } |
| 103 | + |
| 104 | + if (FirstOperand == null) |
| 105 | + { |
| 106 | + return true; |
| 107 | + } |
| 108 | + |
| 109 | + switch (text) |
| 110 | + { |
| 111 | + case "±": |
| 112 | + { |
| 113 | + Text = GetValue(); |
| 114 | + if (FirstOperand != null) |
| 115 | + { |
| 116 | + FirstOperand = FirstOperand[0] == '-' ? FirstOperand[1..FirstOperand.Length] : $"-{FirstOperand[0..FirstOperand.Length]}"; |
| 117 | + } |
| 118 | + |
| 119 | + Operator = null; |
| 120 | + Text = FirstOperand; |
| 121 | + return true; |
| 122 | + } |
| 123 | + |
| 124 | + case "√": |
| 125 | + { |
| 126 | + Text = GetValue(); |
| 127 | + if (FirstOperand != null) |
| 128 | + { |
| 129 | + FirstOperand = FirstOperand[0] == '-' ? null : Math.Sqrt(double.Parse(FirstOperand)).ToString(); |
| 130 | + } |
| 131 | + |
| 132 | + Text = FirstOperand; |
| 133 | + return true; |
| 134 | + } |
| 135 | + |
| 136 | + case "⌫": |
| 137 | + { |
| 138 | + if (SecondOperand != null) |
| 139 | + { |
| 140 | + if (SecondOperand.Length == 1) |
| 141 | + { |
| 142 | + SecondOperand = null; |
| 143 | + Text = $"{FirstOperand} {Operator} "; |
| 144 | + } |
| 145 | + |
| 146 | + else |
| 147 | + { |
| 148 | + SecondOperand = SecondOperand[0..(SecondOperand.Length - 1)]; |
| 149 | + Text = $"{FirstOperand} {Operator} {SecondOperand}"; |
| 150 | + } |
| 151 | + } |
| 152 | + |
| 153 | + else if (Operator != null) |
| 154 | + { |
| 155 | + Operator = null; |
| 156 | + Text = $"{FirstOperand} "; |
| 157 | + } |
| 158 | + |
| 159 | + else if (FirstOperand != null) |
| 160 | + { |
| 161 | + if (FirstOperand.Length == 1) |
| 162 | + { |
| 163 | + FirstOperand = null; |
| 164 | + Text = ""; |
| 165 | + } |
| 166 | + |
| 167 | + else |
| 168 | + { |
| 169 | + FirstOperand = FirstOperand[0..(FirstOperand.Length - 1)]; |
| 170 | + Text = $"{FirstOperand}"; |
| 171 | + } |
| 172 | + } |
| 173 | + |
| 174 | + return true; |
| 175 | + } |
| 176 | + |
| 177 | + case "C": |
| 178 | + { |
| 179 | + Text = FirstOperand = SecondOperand = Operator = SecondOperator = null; |
| 180 | + return false; |
| 181 | + } |
| 182 | + |
| 183 | + case "=": |
| 184 | + { |
| 185 | + Text = FirstOperand = GetValue(); |
| 186 | + SecondOperand = Operator = SecondOperator = null; |
| 187 | + return true; |
| 188 | + } |
| 189 | + |
| 190 | + default: |
| 191 | + { |
| 192 | + Text += " " + text + " "; |
| 193 | + if (Operator != null) |
| 194 | + { |
| 195 | + if (SecondOperand == null) |
| 196 | + { |
| 197 | + Operator = text; |
| 198 | + } |
| 199 | + SecondOperator = text; |
| 200 | + return false; |
| 201 | + } |
| 202 | + Operator = text; |
| 203 | + return false; |
| 204 | + } |
| 205 | + } |
| 206 | + } |
| 207 | +} |
| 208 | + |
| 209 | + |
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