double
     exp(double x);

     long double
     expl(long double x);

     float
     expf(float x);

     double
     exp2(double x);

     long double
     exp2l(long double x);

     float
     exp2f(float x);

     double
     expm1(double x);

     long double
     expm1l(long double x);

     float
     expm1f(float x);

DESCRIPTION

     The exp() function computes e**x, the base-e exponential of x.

     The exp2() function computes 2**x, the base-2 exponential of x.

     The expm1() function computes the base-e exponential of x , minus 1 accu-
     rately even for very small values of x.

SPECIAL VALUES

     exp(+-0) and exp2(+-0) return 1.

     exp(-infinity) and exp2(-infinity) return +0.

     exp(+infinity) and exp2(+infinity) return +infinity.

     expm1(+-0) returns +-0.

     expm1(-infinity) returns -1.

     expm1(+infinity) returns +infinity.

     For all these functions, a range error occurs if the magnitude of x is
     too large.