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    Command:

    ceil

    
    
    
    

    SYNOPSIS

           #include <math.h>
    
           double ceil(double x);
           float ceilf(float x);
           long double ceill(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           ceilf(), ceill():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           These  functions  return  the  smallest integral value that is not less
           than x.
    
           For example, ceil(0.5) is 1.0, and ceil(-0.5) is 0.0.
    
    
    

    RETURN VALUE

           These functions return the ceiling of x.
    
           If x is integral, +0, -0, NaN, or infinite, x itself is returned.
    
    
    

    ERRORS

           No errors occur.  POSIX.1-2001 documents a range error  for  overflows,
           but see NOTES.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The ceil(), ceilf(), and ceill() functions are thread-safe.
    
    
    

    CONFORMING TO

           C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
           4.3BSD, C89.
    
    
    

    NOTES

           SUSv2 and POSIX.1-2001 contain text about  overflow  (which  might  set
           errno  to ERANGE, or raise an FE_OVERFLOW exception).  In practice, the
           result cannot overflow on any current machine, so  this  error-handling
           stuff is just nonsense.  (More precisely, overflow can happen only when
           the maximum value of the exponent is smaller than the  number  of  man-
           tissa bits.  For the IEEE-754 standard 32-bit and 64-bit floating-point
           numbers the maximum value of the exponent is 128 (respectively,  1024),
           and the number of mantissa bits is 24 (respectively, 53).)
    
           The  integral  value  returned  by  these functions may be too large to
           store in an integer type (int, long,  etc.).   To  avoid  an  overflow,
    
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