1 #include <stdio.h>
  2 #include <stdbool.h>
  3 
  4 struct foo1 {
  5     char *p;
  6     char c;
  7     long x;
  8 };
  9 
 10 struct foo2 {
 11     char c;      /* 1 byte */
 12     char pad[7]; /* 7 bytes */
 13     char *p;     /* 8 bytes */
 14     long x;      /* 8 bytes */
 15 };
 16
 
 
 17 struct foo3 {
 18     char *p;     /* 8 bytes */
 19     char c;      /* 1 byte */
 20 };
 21 
 22 struct foo4 {
 23     short s;     /* 2 bytes */
 24     char c;      /* 1 byte */
 25 };
 26 
 27 struct foo5 {
 28     char c;
 29     struct foo5_inner {
 30         char *p;
 31         short x;
 32     } inner;
 
 33 };
 34 
 35 struct foo6 {
 36     short s;
 37     char c;
 38     int flip:1;
 39     int nybble:4;
 40     int septet:7;
 41 };
 42 
 43 struct foo7 {
 44     int bigfield:31;
 45     int littlefield:1;
 46 };
 47 
 48 struct foo8 {
 49     int bigfield1:31;
 50     int littlefield1:1;
 51     int
 
 bigfield2:31;
 52     int littlefield2:1;
 53 };
 54 
 55 struct foo9 {
 56     int bigfield1:31;
 57     int bigfield2:31;
 58     int littlefield1:1;
 59     int littlefield2:1;
 60 };
 61 
 62 struct foo10 {
 63     char c;
 64     struct foo10 *p;
 65     short x;
 66 };
 67 
 68 struct foo11 {
 69     struct foo11 *p;
 70     short x;
 71     char c;
 72 };
 73 
 74 struct foo12 {
 75     struct foo12_inner {
 76         char *p;
 77         short x;
 78     } inner;
 79     char c;
 80 };
 81 
 82 int main(int argc, char *argv)
 83 {
 84     printf("sizeof(char *)        = %zu\n", sizeof(char *));
 85     printf("sizeof(long)          = %zu\n", sizeof(long));
 86     printf("sizeof(int)           = %zu\n", sizeof(int));
 87     printf("sizeof(short)         = %zu\n", sizeof(short));
 88     printf("sizeof(char)          = %zu\n", sizeof(char));
 89     printf("sizeof(float)         = %zu\n", sizeof(float));
 90     printf("sizeof(double)        = %zu\n", sizeof(double));
 91     printf("sizeof(struct foo1)   = %zu\n", sizeof(struct foo1));
 92     printf("sizeof(struct foo2)   = %zu\n", sizeof(struct foo2));
 93     printf("sizeof(struct foo3)   = %zu\n", sizeof(struct foo3));
 94     printf("sizeof(struct foo4)   = %zu\n", sizeof(struct foo4));
 95     printf("sizeof(struct foo5)   = %zu\n", sizeof(struct foo5));
 96     printf("sizeof(struct foo6)   = %zu\n", sizeof(struct foo6));
 97     printf("sizeof(struct foo7)   = %zu\n", sizeof(struct foo7));
 98     printf("sizeof(struct foo8)   = %zu\n", sizeof(struct foo8));
 99     printf("sizeof(struct foo9)   = %zu\n", sizeof(struct foo9));
100     printf("sizeof(struct foo10)   = %zu\n", sizeof(struct foo10));
101     printf("sizeof(struct foo11)   = %zu\n", sizeof(struct foo11));
102     printf("sizeof(struct foo12)   = %zu\n", sizeof(struct foo12));
　　　　　return 0;

103 }