#pragma used

最新推荐文章于 2024-12-21 19:00:00 发布

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最新推荐文章于 2024-12-21 19:00:00 发布

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分类专栏： C语言

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#include <stdio.h>
#include <stdlib.h>

#pragma pack(4)     //default value

#if defined(ANDROID2_0)
  	#pragma message("android-2.0")        //only VS surpose
	#define VERSION "android 2.0"
#elif defined(ANDROID4_0)
	#pragma message("android-4.0")
	#define VERSION "android 4.0"
#else
	#warning No VERSION information...
	#error VERSION Not Find...
#endif

struct t
{
	char c1;   //  char :1   pack:4;   addr 0 
	short s;   //  short:2   pack:4;   addr 2 
	char c2;   //  char :1   pack:4;   addr 4 
	int i;     //  int  :4   pack:4;   addr 8 
};

int main()
{
	printf("%s\n",VERSION);
	
	struct t t1;
	printf("%d\n",sizeof(t1));
	return 0;
}