编程基础(1) - 数据结构:顺序表示例代码

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顺序表

顺序表是在计算机内存中以数组的形式保存的线性表，线性表的顺序存储是指用一组地址连续的存储单元依次存储线性表中的各个元素、使得线性表中在逻辑结构上相邻的数据元素存储在相邻的物理存储单元中，即通过数据元素物理存储的相邻关系来反映数据元素之间逻辑上的相邻关系，采用顺序存储结构的线性表通常称为顺序表。顺序表是将表中的结点依次存放在计算机内存中一组地址连续的存储单元中。

示例代码

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 
  4 #define MAX_DATA_SIZE           10
  5 
  6 typedef struct _SEQLIST {
  7     int data[MAX_DATA_SIZE];
  8     int last_index;
  9 } SEQLIST, *LPSEQLIST;
 10 
 11 /**
 12  * seqlist_isempty - Determine if the table is empty.
 13 */
 14 int seqlist_isempty(LPSEQLIST lplist)
 15 {
 16     return (-1 == lplist->last_index);
 17 }
 18 
 19 /**
 20  * seqlist_isfull - Determine if the table is full up.
 21 */
 22 int seqlist_isfull(LPSEQLIST lplist)
 23 {
 24     return ((MAX_DATA_SIZE - 1) == lplist->last_index);
 25 }
 26 
 27 /**
 28  * seqlist_insert - Add the specified data  by index.
 29 */
 30 int seqlist_insert(LPSEQLIST lplist, int index, int data)
 31 {
 32     int i;
 33 
 34     if ((index < 0) || (index > MAX_DATA_SIZE - 1)) {
 35         printf("invalid index!\n");
 36         return -1;
 37     }
 38 
 39     /* Move the data behind the index. */
 40     for (i = lplist->last_index; i >= index; i--)
 41         lplist->data[i + 1] = lplist->data[i];
 42 
 43     /* Insert the data. */
 44     lplist->data[index] = data;
 45 
 46     /* Update the last index. */
 47     lplist->last_index++;
 48 
 49     return 0;
 50 }
 51 
 52 /**
 53  * seqlist_del - Deletes the specified data by index.
 54 */
 55 int seqlist_del(LPSEQLIST lplist, int index)
 56 {
 57     int i;
 58 
 59     if ((index < 0) || (index > MAX_DATA_SIZE - 1)) {
 60         printf("invalid index!\n");
 61         return -1;
 62     }
 63 
 64     /* Move the data behind the index forward. */
 65     for (i = index; i < lplist->last_index; i++)
 66         lplist->data[i] = lplist->data[i + 1];
 67 
 68     /* Update the last index. */
 69     lplist->last_index--;
 70 
 71     return 0;
 72 }
 73 
 74 /**
 75  * seqlist_init - Initialize sequence list.
 76 */
 77 int seqlist_init(LPSEQLIST *lpHead)
 78 {
 79     /* Allocate memory space. */
 80     *lpHead = (LPSEQLIST)malloc(sizeof(SEQLIST));
 81     if (NULL == *lpHead) {
 82         perror("malloc");
 83         exit(1);
 84     }
 85 
 86     (*lpHead)->last_index = -1;
 87 
 88     return 0;
 89 }
 90 
 91 /**
 92  * seqlist_exit - clear sequence list.
 93 */
 94 int seqlist_exit(LPSEQLIST lpHead)
 95 {
 96     int i = -1;
 97 
 98     if (seqlist_isempty(lpHead)) {
 99         for (i = 0; i < lpHead->last_index; i++)
100             seqlist_del(lpHead, i);
101     }
102 
103     free(lpHead);
104     lpHead = NULL;
105 
106     return 0;
107 }
108 
109 void test_show(LPSEQLIST lplist)
110 {
111     int i;
112 
113     for (i = 0; i <= lplist->last_index; i++)
114         printf("%d ", lplist->data[i]);
115 
116     printf("\n");
117 }
118 
119 int main(void)
120 {
121     int i = -1;
122 
123     LPSEQLIST lphead;
124 
125     seqlist_init(&lphead);
126 
127     for (i = 0; i < MAX_DATA_SIZE; i++)
128         seqlist_insert(lphead, i, i + 1);
129 
130     test_show(lphead);
131 
132     seqlist_del(lphead, 3);
133 
134     test_show(lphead);
135 
136     seqlist_exit(lphead);
137 
138     return 0;
139 }

完整代码可以参考github: [https://github.com/Phoebus-Ma/cnblogs/tree/main/seqlist]

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