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Math::Exp Method
Visual Studio 2010
Returns e raised to the specified power.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- d
- Type: System::Double
A number specifying a power.
Return Value
Type: System::DoubleThe number e raised to the power d. If d equals NaN or PositiveInfinity, that value is returned. If d equals NegativeInfinity, 0 is returned.
The following example uses Exp to evaluate certain exponential and logarithmic identities for selected values.
// Example for the Math::Exp( double ) method. using namespace System; // Evaluate logarithmic/exponential identity with a given argument. void UseLnExp( double arg ) { // Evaluate e ^ ln(X) == ln(e ^ X) == X. Console::WriteLine( "\n Math::Exp(Math::Log({0})) == {1:E16}\n" " Math::Log(Math::Exp({0})) == {2:E16}", arg, Math::Exp( Math::Log( arg ) ), Math::Log( Math::Exp( arg ) ) ); } // Evaluate exponential identities that are functions of two arguments. void UseTwoArgs( double argX, double argY ) { // Evaluate (e ^ X) * (e ^ Y) == e ^ (X + Y). Console::WriteLine( "\nMath::Exp({0}) * Math::Exp({1}) == {2:E16}" "\n Math::Exp({0} + {1}) == {3:E16}", argX, argY, Math::Exp( argX ) * Math::Exp( argY ), Math::Exp( argX + argY ) ); // Evaluate (e ^ X) ^ Y == e ^ (X * Y). Console::WriteLine( " Math::Pow(Math::Exp({0}), {1}) == {2:E16}" "\n Math::Exp({0} * {1}) == {3:E16}", argX, argY, Math::Pow( Math::Exp( argX ), argY ), Math::Exp( argX * argY ) ); // Evaluate X ^ Y == e ^ (Y * ln(X)). Console::WriteLine( " Math::Pow({0}, {1}) == {2:E16}" "\nMath::Exp({1} * Math::Log({0})) == {3:E16}", argX, argY, Math::Pow( argX, argY ), Math::Exp( argY * Math::Log( argX ) ) ); } int main() { Console::WriteLine( "This example of Math::Exp( double ) " "generates the following output.\n" ); Console::WriteLine( "Evaluate [e ^ ln(X) == ln(e ^ X) == X] " "with selected values for X:" ); UseLnExp( 0.1 ); UseLnExp( 1.2 ); UseLnExp( 4.9 ); UseLnExp( 9.9 ); Console::WriteLine( "\nEvaluate these identities with " "selected values for X and Y:" ); Console::WriteLine( " (e ^ X) * (e ^ Y) == e ^ (X + Y)" ); Console::WriteLine( " (e ^ X) ^ Y == e ^ (X * Y)" ); Console::WriteLine( " X ^ Y == e ^ (Y * ln(X))" ); UseTwoArgs( 0.1, 1.2 ); UseTwoArgs( 1.2, 4.9 ); UseTwoArgs( 4.9, 9.9 ); } /* This example of Math::Exp( double ) generates the following output. Evaluate [e ^ ln(X) == ln(e ^ X) == X] with selected values for X: Math::Exp(Math::Log(0.1)) == 1.0000000000000001E-001 Math::Log(Math::Exp(0.1)) == 1.0000000000000008E-001 Math::Exp(Math::Log(1.2)) == 1.2000000000000000E+000 Math::Log(Math::Exp(1.2)) == 1.2000000000000000E+000 Math::Exp(Math::Log(4.9)) == 4.9000000000000012E+000 Math::Log(Math::Exp(4.9)) == 4.9000000000000004E+000 Math::Exp(Math::Log(9.9)) == 9.9000000000000004E+000 Math::Log(Math::Exp(9.9)) == 9.9000000000000004E+000 Evaluate these identities with selected values for X and Y: (e ^ X) * (e ^ Y) == e ^ (X + Y) (e ^ X) ^ Y == e ^ (X * Y) X ^ Y == e ^ (Y * ln(X)) Math::Exp(0.1) * Math::Exp(1.2) == 3.6692966676192444E+000 Math::Exp(0.1 + 1.2) == 3.6692966676192444E+000 Math::Pow(Math::Exp(0.1), 1.2) == 1.1274968515793757E+000 Math::Exp(0.1 * 1.2) == 1.1274968515793757E+000 Math::Pow(0.1, 1.2) == 6.3095734448019331E-002 Math::Exp(1.2 * Math::Log(0.1)) == 6.3095734448019344E-002 Math::Exp(1.2) * Math::Exp(4.9) == 4.4585777008251705E+002 Math::Exp(1.2 + 4.9) == 4.4585777008251716E+002 Math::Pow(Math::Exp(1.2), 4.9) == 3.5780924170885260E+002 Math::Exp(1.2 * 4.9) == 3.5780924170885277E+002 Math::Pow(1.2, 4.9) == 2.4433636334442981E+000 Math::Exp(4.9 * Math::Log(1.2)) == 2.4433636334442981E+000 Math::Exp(4.9) * Math::Exp(9.9) == 2.6764450551890982E+006 Math::Exp(4.9 + 9.9) == 2.6764450551891015E+006 Math::Pow(Math::Exp(4.9), 9.9) == 1.1684908531676833E+021 Math::Exp(4.9 * 9.9) == 1.1684908531676829E+021 Math::Pow(4.9, 9.9) == 6.8067718210957060E+006 Math::Exp(9.9 * Math::Log(4.9)) == 6.8067718210956985E+006 */
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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