Demonstrates using `RewindOnChange(true)` to perform recursive-style transformations, such as creating a variadic `AddUp` function.

ID: 346

See: ExpressionTransformer = [Transformer] 
				
					using uCalcSoftware;

var uc = new uCalc();
var t = uc.ExpressionTransformer;

// Base case: a single argument
t.FromTo("AddUp({x})", "{x}");

// Recursive case: multiple arguments
// RewindOnChange(true) causes the transformer to re-scan the string after a replacement.
// This allows AddUp(1,2,3) -> (1 + AddUp(2,3)) -> (1 + (2 + AddUp(3))) -> (1 + (2 + 3))
t.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))").RewindOnChange = true;

Console.WriteLine("Input: AddUp(1, 2, 3, 4)");
Console.WriteLine($"Result: {uc.Eval("AddUp(1, 2, 3, 4)")}");
				
			
Input: AddUp(1, 2, 3, 4)
Result: 10
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					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   auto t = uc.ExpressionTransformer();

   // Base case: a single argument
   t.FromTo("AddUp({x})", "{x}");

   // Recursive case: multiple arguments
   // RewindOnChange(true) causes the transformer to re-scan the string after a replacement.
   // This allows AddUp(1,2,3) -> (1 + AddUp(2,3)) -> (1 + (2 + AddUp(3))) -> (1 + (2 + 3))
   t.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))").RewindOnChange(true);

   cout << "Input: AddUp(1, 2, 3, 4)" << endl;
   cout << "Result: " << uc.Eval("AddUp(1, 2, 3, 4)") << endl;
}
				
			
Input: AddUp(1, 2, 3, 4)
Result: 10
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					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim t = uc.ExpressionTransformer
      
      '// Base case: a single argument
      t.FromTo("AddUp({x})", "{x}")
      
      '// Recursive case: multiple arguments
      '// RewindOnChange(true) causes the transformer to re-scan the string after a replacement.
      '// This allows AddUp(1,2,3) -> (1 + AddUp(2,3)) -> (1 + (2 + AddUp(3))) -> (1 + (2 + 3))
      t.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))").RewindOnChange = true
      
      Console.WriteLine("Input: AddUp(1, 2, 3, 4)")
      Console.WriteLine($"Result: {uc.Eval("AddUp(1, 2, 3, 4)")}")
   End Sub
End Module
				
			
Input: AddUp(1, 2, 3, 4)
Result: 10
Explore 600+ other examples