C语言 指针方法 有一个班4个学生，5门课程

有一个班4个学生,5门课程。一：求第1门课程的平均分;二：找出有两门以上课程不及格的学生,输出他们的学号和全部课程成绩及平均成绩;三：找出平均成绩在90分以上或全部课程成绩在85分以上的学生。分别编3个函数实现以上3个要求。

#include <stdio.h>

#define NUM_STUDENTS 4
#define NUM_COURSES 5

void averageFirstCourse(int scores[NUM_STUDENTS][NUM_COURSES]) {
    double total = 0;
    for (int i = 0; i < NUM_STUDENTS; i++) {
        total += scores[i][0];
    }
    printf("Average score of the first course: %f\n", total / NUM_STUDENTS);
}

void findFailingStudents(int scores[NUM_STUDENTS][NUM_COURSES]) {
    for (int i = 0; i < NUM_STUDENTS; i++) {
        int failCount = 0;
        for (int j = 0; j < NUM_COURSES; j++) {
            if (scores[i][j] < 60) {
                failCount++;
            }
        }
        if (failCount >= 2) {
            printf("Student %d failed in %d courses. Scores: ", i + 1, failCount);
            double average = 0;
            for (int j = 0; j < NUM_COURSES; j++) {
                printf("%d ", scores[i][j]);
                average += scores[i][j];
            }
            printf("Average: %f\n", average / NUM_COURSES);
        }
    }
}

void findExcellentStudents(int scores[NUM_STUDENTS][NUM_COURSES]) {
    for (int i = 0; i < NUM_STUDENTS; i++) {
        double average = 0;
        int allAbove85 = 1;
        for (int j = 0; j < NUM_COURSES; j++) {
            average += scores[i][j];
            if (scores[i][j] < 85) {
                allAbove85 = 0;
            }
        }
        average /= NUM_COURSES;
        if (average > 90 || allAbove85) {
            printf("Student %d is excellent. Scores: ", i + 1);
            for (int j = 0; j < NUM_COURSES; j++) {
                printf("%d ", scores[i][j]);
            }
            printf("Average: %f\n", average);
        }
    }
}

int main() {
    int scores[NUM_STUDENTS][NUM_COURSES] = {
        {95, 85, 76, 67, 88},
        {55, 78, 88, 93, 91},
        {45, 56, 73, 66, 80},
        {89, 92, 97, 81, 86}
    };

    averageFirstCourse(scores);
    findFailingStudents(scores);
    findExcellentStudents(scores);

    return 0;
}

代码解释：

• averageFirstCourse函数计算第1门课程的平均分。
• findFailingStudents函数找出有两门以上课程不及格的学生并输出详细信息。
• findExcellentStudents函数找出平均成绩在90分以上或全部课程成绩在85分以上的学生。
• main函数中初始化一个班4个学生，5门课程的成绩矩阵，并调用这三个函数进行处理。