表弟现在正在考c语言
题目：给出n个学生的mgate课程的考试成绩信息，每条信息由姓名、课程代号与分数组成，要求设计算法：
（1）输入每个人的各gate课程的成绩，计算每人的平均成绩；
（2）按平均成绩的高低次序，打印出出个人的名次，平均成绩相同的为同一名次；
（3）按名次列出每个学生的姓名和各科成绩；
〔基本要求〕 学生的考试成绩必须通过键盘输入，且需对输出进行格式控制；
〔算法提示〕可以用选择排序、冒泡排序等多种排序算法求解；
表弟写了一个，可是有问题，他发给我让我修改哈，可我学c语言那是大一时候的
求达人蝈蝈指点：
#include <stdio.h>

struct CStu
{
char m_strName[20];//姓名
double m_dbEnglish; //英语成绩
double m_dbMath; //数学成绩
double m_dbChinese; //语文成绩
double m_dbAvg; //平均成绩
int m_nPlace; //名次
};

int k = 0;
int m = 1;
const int COUNT = 3;
CStu g_strStu[COUNT];


//求平均成绩
double computeAvg(CStu stu)
{
double dbAvg = (stu.m_dbEnglish+stu.m_dbMath+stu.m_dbChinese)/3.0;
return dbAvg;
}

//录入学生成绩
double AddStu()
{
CStu stu;


printf("请输入学生姓名：");
scanf("%s", stu.m_strName);

printf("请输入英语成绩：");
scanf("%lf", &stu.m_dbEnglish);

printf("请输入数学成绩：");
scanf("%lf", &stu.m_dbMath);

printf("请输入语文成绩：");
scanf("%lf", &stu.m_dbChinese);
stu.m_nPlace = 1;
stu.m_dbAvg = computeAvg(stu);
g_strStu[k++] = stu;

return stu.m_dbAvg;
}

//排名
void OrderByScore()
{
double dbTemp = g_strStu[0].m_dbAvg;

for(int i = 0; i < COUNT; i++)
{
for(int j = 0; j < COUNT - i - 1; j++)
{
if(g_strStu[j].m_dbAvg < g_strStu[j+1].m_dbAvg)
{
CStu stuTemp = g_strStu[j];
g_strStu[j] = g_strStu[j + 1];
g_strStu[j + 1] = stuTemp;
}
}
}

for(i = 0; i < COUNT - 1; i++)
{

if(g_strStu.m_dbAvg > g_strStu[i+1].m_dbAvg)
{
g_strStu.m_nPlace = m++;
}
else
{
g_strStu.m_nPlace = m;
}
}

g_strStu[COUNT - 1].m_nPlace = m;

}

//按排名显示
void show()
{
OrderByScore();
printf("学生成绩排名");
for(int i = 0; i < COUNT; i++)
{
printf("\n%d %s %lf %lf %lf\n",g_strStu.m_nPlace,g_strStu.m_strName,g_strStu.m_dbEnglish,
g_strStu.m_dbMath,g_strStu.m_dbChinese);
}
}

void main(void)
{
for(int i = 0; i < COUNT; i++)
{
printf("该学生平均是：%lf\n", AddStu());
}

show();
}

达人蝈蝈在哪啊？
快快现身吧！
阿弥陀佛！

编译了一下，报的错太多了

+++++++++++
$ gcc temp.c -o temp.o
temp.c:16: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘g_strStu’
temp.c:20: error: expected ‘)’ before ‘stu’
temp.c: In function ‘AddStu’:
temp.c:29: error: ‘CStu’ undeclared (first use in this function)
temp.c:29: error: (Each undeclared identifier is reported only once
temp.c:29: error: for each function it appears in.)
temp.c:29: error: expected ‘;’ before ‘stu’
temp.c:33: error: ‘stu’ undeclared (first use in this function)
temp.c:45: error: ‘g_strStu’ undeclared (first use in this function)
temp.c: In function ‘OrderByScore’:
temp.c:53: error: ‘g_strStu’ undeclared (first use in this function)
temp.c:55: error: ‘for’ loop initial declaration used outside C99 mode
temp.c:57: error: ‘for’ loop initial declaration used outside C99 mode
temp.c:61: error: ‘CStu’ undeclared (first use in this function)
temp.c:61: error: expected ‘;’ before ‘stuTemp’
temp.c:63: error: ‘stuTemp’ undeclared (first use in this function)
temp.c: In function ‘show’:
temp.c:90: error: ‘for’ loop initial declaration used outside C99 mode
temp.c:92: error: ‘g_strStu’ undeclared (first use in this function)
temp.c: In function ‘main’:
temp.c:99: error: ‘for’ loop initial declaration used outside C99 mode
temp.c:98: warning: return type of ‘main’ is not ‘int’
+++++++++++

要改的地方很多，而偏偏又把C忘了差不多，改是来不及了。