1 //读写结构体
2 #include <stdio.h>
3 typedef struct student
4 {
5 int num;
6 char name[30];
7 char sex;
8 float math;
9 float english;
10 float chinese;
11
12 }Stu;
13
14 Stu s[5] =
15 {
16 1001,"wukong",'x',99,99,99,
17 1002,"songjiang",'x',99,22,11,
18 1003,"baoyu",'x',79,33,100,
19 1004,"liudehua",'y',100,100,88,
20 1005,"zhaosi",'z',33,34,12
21 };
22
23 int main(void)
24 {
25
26 //往文件中写入结构体
27 FILE* pf = fopen("G:/qtcode/stu.data","w+");
28 if(pf == NULL)
29 exit(-1);
30 #if 1
31 //写入方式1
32 int i;
33 for(i = 0;i<sizeof(s)/sizeof(*s);i++)
34 {
35 fwrite((void*)(&s[i]),sizeof(Stu),1,pf);
36 }
37 #endif
38 #if 0
39 //写入方式2
40 fwrite((void*)s,sizeof(s),1,pf);
41
42 #endif
43 #if 0
44 //写入方式3
45 fwrite((void*)s,sizeof(Stu),5,pf);
46
47 #endif
48
49
50
51 rewind(pf);
52 //从文件中读结构体
53 #if 0
54 //读出方式1
55 Stu buf;
56 while( fread((void*)&buf,sizeof(Stu),1,pf) )
57 {
58 printf("num = %d\n",buf.num);
59 printf("name = %s\n",buf.name);
60 printf("sex = %c\n",buf.sex);
61 printf("math = %.2f\n",buf.math);
62 printf("english = %.2f\n",buf.english);
63 printf("chinese = %.2f\n",buf.chinese);
64 printf("--------------\n");
65 }
66 #endif
67
68 #if 0
69 //读出方式2
70 Stu buf[3];
71 int j,n;
72 while((n = fread((void*)buf,sizeof(Stu),3,pf)) > 0)
73 {
74 for(j = 0;j < n;j++)
75 {
76 printf("num = %d\n",buf[j].num);
77 printf("name = %s\n",buf[j].name);
78 printf("sex = %c\n",buf[j].sex);
79 printf("math = %.2f\n",buf[j].math);
80 printf("english = %.2f\n",buf[j].english);
81 printf("chinese = %.2f\n",buf[j].chinese);
82 printf("--------------\n");
83 }
84 }
85 #endif
86
87 #if 0
88 //读出方式3
89 Stu buf[5];
90 int j;
91 fread((void*)buf,sizeof(Stu),5,pf);
92 for(j = 0;j < 5;j++)
93 {
94 printf("num = %d\n",buf[j].num);
95 printf("name = %s\n",buf[j].name);
96 printf("sex = %c\n",buf[j].sex);
97 printf("math = %.2f\n",buf[j].math);
98 printf("english = %.2f\n",buf[j].english);
99 printf("chinese = %.2f\n",buf[j].chinese);
100 printf("--------------\n");
101 }
102 #endif
103 return 0;
104 }
