//+------------------------------------------------------------------+
//|                                                      MathExp.mq5 |
//|                                  Copyright 2021, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+

#define PRT(A)  Print(#A, "=", (A))

//+------------------------------------------------------------------+
//| Custom implementation of binary logarithm                        |
//+------------------------------------------------------------------+
double Log2(double value)
{
   return MathLog(value) / M_LN2;
}

//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
{
   PRT(MathExp(0.5));     // 1.648721270700128
   PRT(MathPow(M_E, 0.5));// 1.648721270700128
   PRT(MathExp(10000.0)); // inf, NaN
   
   PRT(MathLog(M_E));     // 1.0
   PRT(MathLog(10000.0)); // 9.210340371976184
   PRT(MathLog(0.5));     // -0.6931471805599453
   PRT(MathLog(0.0));     // -inf, NaN
   PRT(MathLog(-0.5));    // -nan(ind)

   PRT(Log2(128));        // 7
   
   PRT(MathLog10(10.0));    // 1.0
   PRT(MathLog10(10000.0)); // 4.0

   PRT(MathExpm1(0.1));   // 0.1051709180756476
   PRT(MathLog1p(0.1));   // 0.09531017980432487
}
//+------------------------------------------------------------------+