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expm1, expm1f, expm1l

Computes the base-e exponential of a value, minus one.

double expm1( 
   double x 
);
float expm1(
   float x
);  // C++ only
long double expm1(
   long double x
);  // C++ only
float expm1f(
   float x
);
long double expm1l(
   long double x
);

x

The floating-point exponential value.

The expm1 functions return a floating-point value that represents ex – 1, if successful. On overflow, expm1 returns HUGE_VAL, expm1f returns HUGE_VALF, expm1l returns HUGE_VALL, and errno is set to ERANGE. For more information about return codes, see errno, _doserrno, _sys_errlist, and _sys_nerr.

Because C++ allows overloading, you can call overloads of expm1 that take and return float and long double values. In a C program, expm1 always takes and returns a double.

Routine

Required header

expm1, expm1f, expm1l

<math.h>

For additional compatibility information, see Compatibility.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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