1.结构体字节对齐64位，32位，指定2字节对齐

struct data{
char t1;
char t2;
unsigned short t3;
unsigned long t4;
};64位	16
//1
//1
//2	//4
//8
32位	8
//1
//1
//2
//4struct data{
char t1;
int t2;
short t3;
};64位	12
//1	//3
//4
//2	//2
32位	12
//1	//3
//4
//2	//2struct s1
{
char c1;
int i;
char c2;
};
struct s2
{
char c1;
char c2;
int i;
};s1
64位	12
//1	//3
//4
//1	//3
32位	12
//1	//3
//4
//1	//3s2
64位	8
//1
//1	//2
//4
32位	8
//1
//1	//2
//4typedef struct Test
{
short a;
struct
{
int b;
double c;
char d;
}p;
int e;
}Test;64位	40
//2	//6
{//4	//4
//8
//1	//7}//24
//4	//4
32位	24
//2	//2
{//4
//8
//1	//3
}//16
//4typedef struct Test
{
short a;
struct
{
int b;
double c[10];
char d;
}p;
int e;
}Test;64位	112
//2	//6
{//4	//4
//8*10
//1	//7
}//96
//4	//4
32位	96
//2	//2
{//4
//8*10	
//1	//3
}//88
//4struct C{
char b;
int a;
short c;
};64位	12
//1	//3
//4
//2	//2
32位	12
//1	//3
//4
//2	//2struct C {
char a;
char b[3];
char c;
};64位	5
//1
//1*3
//1
32位	5
//1
//1*3
//1typedef struct
{
int b;
char a;
long e;
char c;
float d;
double t;
}node;64位	32
//4
//1	//3
//8
//1	//3
//4
//8	
32位	28
//4
//1	//3
//4
//1	//3
//4
//8//指定2字节对齐
#pragma pack(2)
typedef struct
{char c;struct A{short a;int *b;char c;}p;long b;int a;
}T;
#pragma pack()64位	26
//1	//1
{//2
//8
//1	//1
}//12
//8
//4
32位	18
//1	//1
{//2
//4
//1	//1
}//8
//4
//4

 

2.两种验证大小端对齐的代码写一遍

//用union判断
#include <stdio.h>
union A
{char t1;int t2;
};
int main(int argc, const char *argv[])
{union A a1;   //栈区a1.t2 = 0x12345678;   //0x12数据高位  0x78数据低位printf("%#X\n",a1.t1);if (a1.t1==0x78){printf("小端\n");}else{printf("大端\n");}return 0;
}
//用指针判断
#include <stdio.h>
int main(int argc, const char *argv[])
{int a = 0x12345678;char *p = &a; //为了只取a的低地址的数据if(*p==0x78){printf("小端\n");}else{printf("大端\n");}return 0;
}

3.完善顺序表已写出的功能

//main.c#include "seq_list.h"
int main()
{seq_p L = create_seq_list();printf("%d\n",seq_empty(L));printf("%d\n",seq_full(L));return 0;
}//seq_list.c#include "seq_list.h"seq_p create_seq_list()
{seq_p L = (seq_p)malloc(sizeof(seq_list));if(L==NULL){printf("空间申请失败\n");return;}L->len = 0;bzero(L,sizeof(L->data));return L;
}int seq_empty(seq_p L)
{if(L==NULL)return -1;return L->len==0?1:0;
}
int seq_full(seq_p L)
{if(L==NULL)return -1;return L->len==MAX?1:0;
}//seq_list.h#ifndef _SEQ_LIST_H
#define _SEQ_LIST_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 7
typedef int datatype;
typedef struct seq_list
{datatype data[MAX];int len;
}seq_list,*seq_p;
seq_p create_seq_list();
int seq_full(seq_p L);int seq_empty(seq_p L);#endif