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24 game/CSharp: Difference between revisions
m
removed some duplication caused by copy/paste, edited intro text, homogenized open bracket placement
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m (removed some duplication caused by copy/paste, edited intro text, homogenized open bracket placement) |
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You could, for example, use the CodeDOM to dynamically compile an object that contains the expression string.
<lang csharp>
public class XPathEval : I24MathParser {
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Here is a more verbose, native solution - a lightweight math expression parser for evaluating 24 Game user input:
<lang csharp>
/// <summary>
/// Lightweight math parser - C# does not have an Evaluate function
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float Solve(string equation) {
//carry out order of operations
// bracketed subexpressions - for any operator
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Match match = subExpression.Match(equation);
while (match.Success) {
if (match.Groups[1].Length > 0) {▼
▲ if (match.Groups[1].Length > 0)
//recursively solve for subexpressions -- match group 1 excludes outer brackets
subResult = Solve(match.Groups[1].Value);
}
else {
//no more nested expressions - get final result for this subExpression
subResult = ParseEquation(match.Value);
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