C语言（用函数写）代码生成，输入10个学生10门课程的成绩，要求包括的功能： 1．求出某个学生的最高成绩； 2．求出某门课程的最高成绩； 3．求出某个学生的平均成绩； 4．求出某门课程的平均成绩； 5．增加一个学生及其N门课程的成绩。

下面是一个使用函数实现的 C 语言代码，实现了你所要求的功能：

#include <stdio.h>

#define MAX_STUDENT 10
#define MAX_COURSE 10

void input_scores(int scores[][MAX_COURSE], int num_students, int num_courses);
void print_scores(int scores[][MAX_COURSE], int num_students, int num_courses);
int max_score_student(int scores[][MAX_COURSE], int student, int num_courses);
int max_score_course(int scores[][MAX_COURSE], int course, int num_students);
float average_score_student(int scores[][MAX_COURSE], int student, int num_courses);
float average_score_course(int scores[][MAX_COURSE], int course, int num_students);
void add_student(int scores[][MAX_COURSE], int *num_students_ptr, int num_courses);

int main(void) {
    int scores[MAX_STUDENT][MAX_COURSE];
    int num_students = MAX_STUDENT;
    int num_courses = MAX_COURSE;

    input_scores(scores, num_students, num_courses);

    printf("Scores:\n");
    print_scores(scores, num_students, num_courses);

    int student = 0;
    printf("Enter student index (0 to %d) to find max score: ", num_students - 1);
    scanf("%d", &student);
    printf("Max score for student %d: %d\n", student, max_score_student(scores, student, num_courses));

    int course = 0;
    printf("Enter course index (0 to %d) to find max score: ", num_courses - 1);
    scanf("%d", &course);
    printf("Max score for course %d: %d\n", course, max_score_course(scores, course, num_students));

    printf("Enter student index (0 to %d) to find average score: ", num_students - 1);
    scanf("%d", &student);
    printf("Average score for student %d: %.2f\n", student, average_score_student(scores, student, num_courses));

    printf("Enter course index (0 to %d) to find average score: ", num_courses - 1);
    scanf("%d", &course);
    printf("Average score for course %d: %.2f\n", course, average_score_course(scores, course, num_students));

    add_student(scores, &num_students, num_courses);
    printf("Scores after adding a student:\n");
    print_scores(scores, num_students, num_courses);

    return 0;
}

void input_scores(int scores[][MAX_COURSE], int num_students, int num_courses) {
    for (int i = 0; i < num_students; i++) {
        printf("Enter scores for student %d:\n", i);
        for (int j = 0; j < num_courses; j++) {
            printf("Course %d: ", j);
            scanf("%d", &scores[i][j]);
        }
    }
}

void print_scores(int scores[][MAX_COURSE], int num_students, int num_courses) {
    for (int i = 0; i < num_students; i++) {
        printf("Student %d: ", i);
        for (int j = 0; j < num_courses; j++) {
            printf("%d ", scores[i][j]);
        }
        printf("\n");
    }
}

int max_score_student(int scores[][MAX_COURSE], int student, int num_courses) {
    int max_score = scores[student][0];
    for (int i = 1; i < num_courses; i++) {
        if (scores[student][i] > max_score) {
            max_score = scores[student][i];
        }
    }
    return max_score;
}

int max_score_course(int scores[][MAX_COURSE], int course, int num_students) {
    int max_score = scores[0][course];
    for (int i = 1; i < num_students; i++) {
        if (scores[i][course] > max_score) {
            max_score = scores[i][course];
        }
    }
    return max_score;
}

float average_score_student(int scores[][MAX_COURSE], int student, int num_courses) {
    int sum = 0;
    for (int i = 0; i < num_courses; i++) {
        sum += scores[student][i];
    }
    return (float) sum / num_courses;
}

float average_score_course(int scores[][MAX_COURSE], int course, int num_students) {
    int sum = 0;
    for (int i = 0; i < num_students; i++) {
        sum += scores[i][course];
    }
    return (float) sum / num_students;
}

void add_student(int scores[][MAX_COURSE], int *num_students_ptr, int num_courses) {
    if (*num_students_ptr >= MAX_STUDENT) {
        printf("Cannot add more students.\n");
        return;
    }

    printf("Enter scores for new student:\n");
    for (int j = 0; j < num_courses; j++) {
        printf("Course %d: ", j);
        scanf("%d", &scores[*num_students_ptr][j]);
    }
    (*num_students_ptr)++;
}

这个程序中，`input_scores` 函数用于输入成绩，`print_scores` 函数用于输出成绩，`max_score_student` 函数用于求出某个学生的最高成绩，`max_score_course` 函数用于求出某门课程的最高成绩，`average_score_student` 函数用于求出某个学生的平均成绩，`average_score_course` 函数用于求出某门课程的平均成绩，`add_student` 函数用于增加一个学生及其 N 门课程的成绩。在 `main` 函数中，我们先调用 `input_scores` 函数输入成绩，然后依次调用上述函数计算所需的结果。其中，`add_student` 函数可以增加一个学生及其 N 门课程的成绩，它通过传入一个指向 `num_students` 变量的指针实现了改变 `num_students` 变量的值。