Compute the exponential function of a number
#include <math.h> double exp( double x ); float expf( float x ); long double expl( long double x );
These functions compute the exponential function of x (e^{x}).
A range error occurs if the magnitude of x is too large.
The exponential value of x. For a correct value that would cause an underflow, these functions return 0.0.
#include <stdio.h> #include <math.h> #include <stdlib.h> int main( void ) { printf( "%f\n", exp(.5) ); return EXIT_SUCCESS; }
produces the output:
1.648721
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |
The value of expm1(x) may be more accurate than exp(x) - 1.0 for small values of x.