N2731
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2731.pdf

N2731, 3.14 memory location
https://researchmap.jp/blogs/blog_entries/view/82322/acf79571910fc36d484a3a2ae81b5934?frame_id=445675
~~https://researchmap.jp/jo7bhb629-1797580/#_1797580~~
original:
https://github.com/Clanguagesubset/c2011/wiki

N27311-3-14.c

// 1 filename:N2731-3-14-ex.
//ver 0.1 December.29, 2013, N1570
// http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf 
//ver0.2 January 11, 2014 add 2 sets of inputs for clarify about warning and assignment. https://qiita.com/kaizen_nagoya/items/e4eafb04e14dbf580a62
// ver. 0.3 Nobemver 25, 2021, N2731
// http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2731.pdf
// 2 original examples and/or notes:
// (c) ISO/IEC JTC1 SC22 WG14 N1570, April 12, 2011
// (c) ISO/IEC JTC1 SC22 WG14 N2731, October 18, 2021
char * st = "N2731 3.14 memory location";
//
// 3 compile and output mechanism:
//(c)   Dr. Kiyoshi Ogawa, ka, Novenber.25, 2021
//
// 4 compile errors and/or wornings:
//Command/Options: gcc std=c2x -Wall n2731-3-14.c 
//
// 5. Hardware:  MacBook Pro, 
//(c) Intel http://ark.intel.com/products/37006/
//Core 2 Duo 2.53GHz, 8GB, 1067MHz DDR3
//
// 6. Special Thanks: Upper organizatios and 
//ISO/IEC JTC1 SC22 WG14, http://www.open-std.org/jtc1/sc22/wg14/www/standards
//ITSCJ/IPSJ http://www.itscj.ipsj.or.jp/itscj_english/index.html
//Daido University, http://www.daido.ac.jp/
//Spancion Inc., http://www.spansion.com/
//SWEST: Summer Workshop on Embedded System Technologies , http://swest.toppers.jp
//CEST: Consortium for Embedded System Technology, http://www.ertl.jp/CEST/
//OSC:Open Source Conference, http://www.ospn.jp/

#include <stdio.h>
//either an object of scalar type, or a maximal sequence of adjacent bit-fields all having nonzero width
// A structure declared as
struct {
char a;
int b:5, c:11,:0, d:8; 
struct { int ee:8; } e;
}
// contains four separate memory locations: The member a, and bit-fields d and e.ee are each separate memory locations, and can be modified concurrently without interfering with each other. The bit-fields b and c together constitute the fourth memory location. The bit-fields b and c cannot be concurrently modified, but b and a, for example, can be.

int main(void){
printf("%s¥n", st);
#endif
f.a = 1;
f.b = 2;
f.c = 3;
f.d = 4;
f.e.ee = 5;
printf(" %d　%d　%d　%d　%d\n", f.a,f.b,f.c,f.d,f.e.ee);
f.a = 1000001;
f.b = 2000002;
f.c = 3000003;
f.d = 4000004;
f.e.ee=5000005;
printf(" %d　%d　%d　%d　%d\n", f.a,f.b,f.c,f.d,f.e.ee);
f.a = 1000000000001;
f.b = 2000000000002;
f.c = 3000000000003;
f.d = 4000000000004;
f.e.ee=5000000000005;
printf("%d　%d　%d　%d　%d\n", f.a,f.b,f.c,f.d,f.e.ee);
}
// no error, no warning 
// output may be
// 3.14 memory location　
// 1　2　3　4　5
// 65　2　-317　4　69
// 1　2　3　4　5

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＜この記事は個人の過去の経験に基づく個人の感想です。現在所属する組織、業務とは関係がありません。＞
This article is an individual impression based on the individual's experience. It has nothing to do with the organization or business to which I currently belong.

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