// filename:c2011-3-20-ex.c
// original examples and/or notes:
// 		(c) ISO/IEC JTC1 SC22 WG14 N1570, April 12, 2011
// 			C2011 C2011 3.20 ceiling, 3.21 floor : Example
// compile and output mechanism:
// 		(c) Ogawa Kiyoshi, kaizen@gifu-u.ac.jp, December.29, 2013
// compile errors and/or wornings:
// 		(c) Apple LLVM version 4.2 (clang-425.0.27) (based on LLVM 3.2svn)
// 			Target: x86_64-apple-darwin11.4.2 //Thread model: posix
// 		(c) LLVM 2003-2009 University of Illinois at Urbana-Champaign.
#include <stdio.h>
#include <math.h>

int main(void)
{
//3.20
// ⎡x⎤
// ceiling of x: the least integer greater than or equal to x
// EXAMPLE ⎡2. 4⎤ is 3, ⎡−2. 4⎤ is −2.
//3.21
// ⎣x⎦
//floor of x: the greatest integer less than or equal to x
// EXAMPLE ⎣2. 4⎦ is 2, ⎣−2. 4⎦ is −3.
signed int a,b,c,d,e;
a = ceil(2.4) ;
b = ceil(-2.4) ;
c = floor(2.4) ;
d = floor(-2.4) ;
printf("C2011 3.20 ceiling, 3.21 floor : Example %d %d %d %d", a,b,c,d);
}
// output may be
//C2011 3.20 ceiling, 3.21 floor : Example 3 -2 2 -3o