1 #include <stdio.h>
2 #include <string.h>
3 struct Student
4 {
5 char m_name[20]; //姓名
6 int m_age; //年龄
7 int m_height; //身高
8 };
9 typedef struct Student Student_t;
10
11 void Student_Print(const Student_t *v,int len)
12 {
13 for(int i = 0; i < len ; i++)
14 {
15 printf("姓名:%s\t年龄:%d\t身高:%d\n",v[i].m_name,v[i].m_age,v[i].m_height);
16 }
17 printf("－－－－－－－－－－－－－－－－－－－－－－－－－－\n");
18 }
19
20 void sort(Student_t *v,int len,int (*cmp)(void *,void *))
21 {
22 Student_t temp;
23 for(int i = 0; i < len ;i++)
24 {
25 for(int j = 0; j < len - 1;j++)
26 {
27 if(cmp(&v[j],&v[j+1]) > 0)
28 {
29 //swap
30 temp = v[j];
31 v[j] = v[j+1];
32 v[j+1] = temp;
33 }
34 }
35 }
36 }
37
38 int Student_age(void *data_1,void *data_2)
39 {
40 Student_t *num_1 = data_1;
41 Student_t *num_2 = data_2;
42
43 return num_1->m_age - num_2->m_age;
44 }
45
46
47 int Student_name(void *data_1,void *data_2)
48 {
49 Student_t *num_1 = data_1;
50 Student_t *num_2 = data_2;
51
52 return strcmp(num_1->m_name,num_2->m_name);
53 }
54
55 int Student_height(void *data_1,void *data_2)
56 {
57 Student_t *num_1 = data_1;
58 Student_t *num_2 = data_2;
59
60 return num_1->m_height - num_2->m_height;
61 }
62
63 int Student_age_height(void *data_1,void *data_2)
64 {
65 Student_t *num_1 = data_1;
66 Student_t *num_2 = data_2;
67 if(num_1->m_age - num_2->m_age == 0)
68 {
69 return num_1->m_height - num_2->m_height;
70 }
71
72 return num_1->m_age - num_2->m_age;
73 }
74
75 int main()
76 {
77 #if 0
78 Student_t stu[] = {{"张三",18,165},{"李四",20,170},{"王五",17,155},{"周六",19,190},{"磊磊",20,180},{"麻子",17,180},{"马云",18,160}};
79 #else
80 Student_t stu[7];
81 memset(stu,0,sizeof(stu)); //清空操作
82 #endif
83 int len = sizeof(stu) / sizeof(stu[0]);
84 Student_Print(stu,len);
85 //sort(stu,len,Student_age); //年龄的升序
86 //sort(stu,len,Student_name); //姓名的升序
87 //sort(stu,len,Student_height); //身高的升序
88 FILE *fp = NULL;
89 fp = fopen("Student.txt","r+");
90 if(fp == NULL)
91 {
92 printf("打开文件失败:\n");
93 return -1;
94 }
95 #if 0
96 sort(stu,len,Student_age_height); //先排年龄后排身高
97 for(int i = 0 ; i < len;i++)
98 {
99 fprintf(fp,"%s %d %d\n",stu[i].m_name,stu[i].m_age,stu[i].m_height);
100 }
101 #else
102 for(int i = 0 ; i < len;i++)
103 {
104 fscanf(fp,"%s %d %d\n",stu[i].m_name,&stu[i].m_age,&stu[i].m_height);
105 }
106 #endif
107 Student_Print(stu,len);
108
109 fclose(fp);
110
111 return 0;
112 }
