std::exp
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  
<cmath>
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|   float       exp( float arg ); 
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|   double      exp( double arg ); 
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|   long double exp( long double arg ); 
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|   double      exp( Integral arg ); 
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(since C++11) | |
Computes the e (Euler's number, 2.7182818) raised to the given power arg
[edit] Parameters
| arg | - | floating point value | 
[edit] Return value
e raised to the power arg
If the result is too large for the underlying type, range error occurs and HUGE_VAL is returned.
[edit] See also
|    computes natural (base e) logarithm (to base e) (ln(x))   (function)  | 
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|    raises a number to the given power (xy)   (function)  | 
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|    complex power, one or both arguments may be a complex number   (function template)  | 
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|    applies the function std::pow to two valarrays or a valarray and a value  (function template)  | 
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