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exp, expf


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The latest version of this topic can be found at exp, expf, expl.

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  


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

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  


Floating-Point Support
log, logf, log10, log10f