1 #include <stdio.h>
 2 #include <string.h>
 3
 4 typedef struct man
 5 {
 6     char name[20];
 7     int age;
 8     char gender[7];
 9 }person_t;
10
11 void input_data(person_t input_data[1024], int);
12 void output_data(person_t output_data[1024], int);
13
14 int main(int argc, char *argv[])
15 {
16     int num;
17     person_t data[1024];
18
19     printf("Enter you want input's numbers : ");
20     scanf("%d", &num);
21
22     input_data(data, num);
23     output_data(data, num);
24
25     printf("\n");
26
27     return 0;
28 }
29
30 void output_data(person_t output_data[1024], int output_num)
31 {
32     int i;
33     for(i = 0; i != output_num; i ++)
34     {
35         printf("The person's name , age, gender is : %s\t%d\t%s.\n", output_data[i].name, output_data[i].age, output_data[i].gender);
36     }
37
38     return ;
39 }
40
41 void input_data(person_t input_data[1024], int input_num)
42 {
43     int i;
44     for(i = 0; i != input_num; i ++)
45     {
46         printf("Enter name age gender : ");
47         scanf("%s %d %s", input_data[i].name, &input_data[i].age, input_data[i].gender);
48     }
49
50     return ;
51 }

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <unistd.h>
 4
 5 typedef struct clock
 6 {
 7     int hour;
 8     int minute;
 9     int second;
10 }time__t;
11
12 int main(int argc, char *argv[])
13 {
14     time__t time = {0, 0 ,0};
15     for( ; ; )
16     {
17         printf("The time is : %d:%d:%d.\n", time.hour, time.minute, time.second);
18         sleep(1);
19         ++ time.second;
20         if(60 == time.second)
21         {
22             ++ time.minute;
23             time.second = 0;
24             if(60 == time.minute)
25             {
26                 ++ time.hour;
27                 time.minute = 0;
28                 if(24 == time.hour)
29                 {
30                     time.hour = 0;
31                 }
32             }
33         }
34     }
35
36     return 0;
37 }

 1 #include <stdio.h>
 2
 3 typedef struct student
 4 {
 5     unsigned short id;
 6     char name[10];
 7     int score;
 8 }stu;
 9
10 void input_data(stu [], int);
11 void sort_data(stu [], int);
12 void output_data(stu [], int);
13
14 int main(int argc, char *argv[])
15 {
16     stu stu_data[1024];
17     int num;
18
19     printf("Enter student's numbers : ");
20     scanf("%d", &num);
21
22     input_data(stu_data, num);
23     sort_data(stu_data, num);
24     printf("After sort!--------------------------------------\n");
25     output_data(stu_data, num);
26
27     return 0;
28 }
29
30 void output_data(stu output_data[1024], int output_num)
31 {
32     int i,itemp = 0;
33     itemp = output_num * 0.7;
34     for(i = 0; i != output_num; i ++)
35     {
36         if(i < itemp) {
37             printf("The students's data is : %hu\t%s\t%d.\t\tpass\n", output_data[i].id, output_data[i].name, output_data[i].score);
38         }
39         else {
40             printf("The students's data is : %hu\t%s\t%d.\t\tfail\n", output_data[i].id, output_data[i].name, output_data[i].score);
41         }
42     }
43 }
44
45 void sort_data(stu sort_data[1024], int sort_num)
46 {
47     int i,j;
48     stu itemp;
49
50     for(i = 0; i != sort_num - 1; i ++)
51     {
52         for(j = 0; j != sort_num; j ++)
53         {
54             if(sort_data[j].score < sort_data[j + 1].score)
55             {
56                 itemp = sort_data[j];
57                 sort_data[j] = sort_data[j + 1];
58                 sort_data[j + 1] = itemp;
59             }
60
61         }
62     }
63
64     return ;
65 }
66
67 void input_data(stu input_data[1024], int input_num)
68 {
69     int i;
70     for(i = 0; i != input_num; i ++)
71     {
72         printf("The sutdents's id name score : ");
73         scanf("%hu %s %d", &input_data[i].id, input_data[i].name, &input_data[i].score);
74     }
75
76     return ;
77 }

 1 #include <stdio.h>
 2 #include <unistd.h>
 3 #include <time.h>
 4
 5 typedef struct stud
 6 {
 7     unsigned short id;
 8     char name[10];
 9     int s[4];
10     double ave;
11 }stu;
12
13 void readrec(stu [], int);
14 void writerec(stu [], int);
15
16 int main(int argc, char *argv[])
17 {
18     stu stu_data[1024];
19     int num;
20
21     printf("Enter students's numbers : ");
22     scanf("%d", &num);
23
24     readrec(stu_data, num);
25     printf("After --------------------------=---------------\n");
26     writerec(stu_data, num);
27
28     return 0;
29 }
30
31 void writerec(stu write_data[1024], int write_num)
32 {
33     int i, j;
34     for(i = 0; i != write_num; i ++)
35     {
36         printf("The students data is : %hu\t%s\t", write_data[i].id, write_data[i].name);
37         for(j = 0; j != 4; j ++)
38         {
39             printf("%d\t", write_data[i].s[j]);
40         }
41         printf("%.2lf", write_data[i].ave);
42         printf("\n");
43     }
44
45     return ;
46 }
47
48 void readrec(stu read_data[1024], int read_num)
49 {
50     srand(time(NULL));
51     int i,j;
52     int sum;
53     for(i = 0; i != read_num; i ++)
54     {
55         sum = 0;
56         printf("Enter id name :");
57         scanf("%hu %s", &read_data[i].id, read_data[i].name);
58         printf("The student's score jisuanzhong .....\n");
59         sleep(1);
60         printf("The score jisuan success-------------\n");
61         for(j = 0; j != 4; j ++)
62         {
63             read_data[i].s[j] = rand() % 100;
64             sum += read_data[i].s[j];
65         }
66         printf("sum = %d.\n", sum);
67         read_data[i].ave = (double)sum / 4;
68     }
69
70     return ;
71 }