// filename:c2011-7-22-2-2-ex.c
// original examples and/or notes:
// 		(c) ISO/IEC JTC1 SC22 WG14 N1570, April 12, 2011
// 			C2011 7.22.2.2 The srand function
// compile and output mechanism:
// 		(c) Ogawa Kiyoshi, kaizen@gifu-u.ac.jp, December.29, 2013
// compile errors and/or wornings:
// 1	(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.
// 2    gcc-4.9 (GCC) 4.9.0 20131229 (experimental)
//      Copyright (C) 2013 Free Software Foundation, Inc.
#include <stdio.h>
// Example
static unsigned long int next = 1;
int rand(void) // RAND_MAX assumed to be 32767
{
next = next * 1103515245 + 12345;
return (unsigned int)(next/65536) % 32768;
}
void srand(unsigned int seed)
{
next = seed;
}

int main(void)
{
	int i;
	srand(i);
	i= rand();
return printf("7.22.2.2 The srand function %d\n",i);
}
// output1(LLVM) may be 
// 7.22.2.2 The srand function 188
// output2(GCC4.9) may be 
// 7.22.2.2 The srand function 25968
//乱数なので、コンパイルの度に最後の結果は同じではないはず。
//LLVMだと毎回値が違う。gcc4.9だと値が同じ。原因不明。