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  
);  
long double expl(  
   long double x  
);  

x
The floating-point value to exponentiate the natural logarithm base e by.

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

The exp function 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 that take a float or long double argument. In a C program, exp always takes and returns a double.

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
_CIexp