How to convert a string into double in UNIX

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nextafterl

NEXTAFTER(3)							libc math functions						      NEXTAFTER(3)

NAME

       nextafter, nexttoward - floating point number manipulation

SYNOPSIS

       #include <math.h>

       double nextafter(double x, double y);
       float nextafterf(float x, float y);
       long double nextafterl(long double x, long double y);

       double nexttoward(double x, long double y);
       float nexttowardf(float x, long double y);
       long double nexttowardl(long double x, long double y);

DESCRIPTION

       The  nextafter()  functions return the next representable neighbor of x in the direction towards y.  The size of the step between x and the
       result depends on the type of the result.  If x = y the function simply returns y.  If either value is NaN, then NaN is	returned.   Other-
       wise a value corresponding to the value of the least significant bit in the mantissa is added or subtracted, depending on the direction.

       The nexttoward() functions do the same as the nextafter() functions, except that they have a long double second argument.

       These functions will signal overflow or underflow if the result goes outside of the range of normalized numbers.

CONFORMING TO

       C99. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).

SEE ALSO

       nearbyint(3)

GNU
								    2002-08-10							      NEXTAFTER(3)

Shell Programming and Scripting