padding.c

来自「这是一个实用的并行计算源代码」· C语言 代码 · 共 31 行

#include <stdio.h>

typedef struct {
    double d;
    char   c;
} CS;

typedef struct {
    char   c1;
    double d;
    char   c2;
} CS1;

int
main()
{
  CS  a;
  CS1 b;

  printf("sizeof(CS)=%d\n", sizeof(CS));
  printf("offset(a.d)=%d, offset(a.c)=%d\n",
	(char *)&a.d - (char *)&a, (char *)&a.c - (char *)&a);

  printf( "sizeof(CS1)=%d\n", sizeof(CS1));
  printf( "offset(b.c1)=%d, offset(b.d)=%d, offset(b.c2)=%d\n",
	(char *)&b.c1 - (char *)&b, (char *)&b.d  - (char *)&b,
	(char *)&b.c2 - (char *)&b);

  return 0;
}