How to convert a string into double in UNIX

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LEARN ABOUT ULTRIX

fabs

floor(3m)																 floor(3m)

Name
       floor,  ffloor,	fabs,  ceil,  ceil,  trunc,  ftrunc, fmod, rint - floor, absolute value, ceiling, truncation, floating point remainder and
       round-to-nearest functions

Syntax
       #include <math.h>

       double floor(x)
       double x;

       float ffloor(x)
       float x;

       double ceil(x)
       double x;

       float fceil(x)
       float x;

       double trunc(x)
       double x;

       float ftrunc(x)
       float x;

       double fabs(x)
       double x;

       double fmod (x, y)
       double x, y;

       double rint(x)
       double x;

Description
       The and routines return the largest integer which is not greater than x for double and float data types, respectively.

       The and routines return the smallest integer which is not less than x for double and float data types, respectively.

       The and routines return the integer (represented as a floating-point number) of x with the fractional bits truncated for double	and  float
       data types respectively.

       The routine returns the absolute value |x|.

       The  routine returns the floating point remainder of the division of x by y: zero if y is zero or if x/y would overflow; otherwise the num-
       ber f with the same sign as x, such that x = iy + f for some integer i, and |f| < |y|.

       The routine returns the integer (represented as a double precision number) nearest x in the direction of the prevailing rounding mode.

       In the default rounding mode, to nearest, is the integer nearest x with the additional stipulation that if |rint(x)-x|=1/2  then  is  even.
       Other rounding modes can make act like or or round towards zero.

       Another way to obtain an integer near x is to declare (in C)
	      double x;     int k;    k = x;
       The  C  compiler  rounds  x  towards 0 to get the integer k.  Also note that, if x is larger than k can accommodate, the value of k and the
       presence or absence of an integer overflow are hard to predict.

       The routine is in libc.a rather than libm.a.

See Also
       abs(3), ieee(3m), math(3m)

								       RISC								 floor(3m)

Shell Programming and Scripting