exp, expf

 

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Calculates the exponential.

double exp(   
   double x  
);  
float exp(  
   float x  
);  // C++ only  
long double exp(  
   long double x  
);  // C++ only  
float expf(   
   float x  
);  

Parameters

x
Floating-point value.

The exp function returns the exponential value of the floating-point parameter, x, if successful. That is, the result is e to the power x, where e is the base of the natural logarithm. On overflow, the function returns INF (infinite) and on underflow, exp returns 0.

InputSEH ExceptionMatherr Exception
± QNAN,INDNone_DOMAIN
± ∞INVALID_DOMAIN
x ≥ 7.097827e+002INEXACT+OVERFLOWOVERFLOW
X ≤ -7.083964e+002INEXACT+UNDERFLOWUNDERFLOW

exp has an implementation that uses Streaming SIMD Extensions 2 (SSE2). See _set_SSE2_enable for information and restrictions on using the SSE2 implementation.

C++ allows overloading, so you can call overloads of exp. In a C program, exp always takes and returns a double.

FunctionRequired header
exp, expf<math.h>

For additional compatibility information, see Compatibility in the Introduction.

// crt_exp.c  
  
#include <math.h>  
#include <stdio.h>  
  
int main( void )  
{  
   double x = 2.302585093, y;  
  
   y = exp( x );  
   printf( "exp( %f ) = %f\n", x, y );  
}  

exp( 2.302585 ) = 10.000000  

System::Math::Exp

Floating-Point Support
log, logf, log10, log10f
_CIexp

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