1 #define _CRT_SECURE_NO_WARNINGS        //关闭安全检查
 2 #include<stdio.h>
 3 #include<stdlib.h>
 4 
 5 //定义结构体类型
 6 struct ST
 7 {
 8     int ID;
 9     char name[20];
10     float score[3];
11 };
12 
13 //方法1 : 结构体数组作为函数参数 开销大
14 float avg(struct ST sts[], int n)
15 {
16     float sum = 0, avg;
17     for (int i = 0; i < n; i++)
18     {
19         for (int j = 0; j < 3; j++)
20         {
21             sum += sts[i].score[j];
22         }
23     }
24     avg = sum / n / 3;
25     return avg;
26 }
27 
28 //方法2 : 结构体数组指针作为函数参数 开销小
29 float avg1(struct ST *p, int n)
30 {
31     float sum = 0, avg;
32     for (int i = 0; i < n; i++)
33     {
34         for (int j = 0; j < 3; j++)
35         {
36             sum += p[i].score[j];
37         }
38     }
39     avg = sum / n / 3;
40     return avg;
41 }
42 
43 //输出最高分数学生信息
44 void high(struct ST *p, int n)
45 {
46     int index = 0;
47     float max = 0, sum = 0;
48     for (int i = 0; i < n; i++)
49     {
50         for (int j = 0; j < 3; j++)
51         {
52             sum = p[i].score[0] + p[i].score[1] + p[i].score[2];
53             if (sum > max)
54             {
55                 max = sum;
56                 index = i;
57             }
58         }
59     }
60     printf("最高学生信息为:\n");
61     //(p+index)->ID 等价于 p[index].ID
62     printf("学号:%d\n", (p+index)->ID);
63     printf("姓名:%s\n", p[index].name);
64     printf("成绩:%.2f, %.2f, %.2f\n", p[index].score[0], p[index].score[1], p[index].score[2]);
65 }
66 
67 int main()
68 {
69     int i, j;
70     struct ST sts[5];
71     for (i = 0; i < 5; i++)
72     {
73         printf("请输入第%d个学生信息\n", i+1);
74         scanf("%d", &sts[i].ID);
75         //加不加&都可以
76         scanf("%s", sts[i].name);
77         printf("输入各科成绩\n");
78         for (j = 0; j < 3; j++)
79         {
80             scanf("%f", &sts[i].score[j]);
81         }
82     }
83 
84     printf("平均成绩为:%f\n", avg1(sts, 5));
85     high(sts, 5);
86     system("pause");
87     return 0;
88 }