C++ 输入10个学生5.门课的成绩,分别用函数实现下列功能: 1计算每个学生的平均分; 2计算每门课的平均分; 3找出所有50个分数中最高的分数所对应的学生和课程;④计算平均分方差: a-吉2-24.I 其中,c;为某一学生的平均分。

好的，我可以帮你解决这个问题。

首先，我们需要声明一个二维数组来存储学生的成绩，代码如下：

const int NUM_STUDENT = 10;
const int NUM_COURSE = 5;
float scores[NUM_STUDENT][NUM_COURSE];

然后，我们需要编写一个函数来计算每个学生的平均分，代码如下：

void calc_student_avg(float scores[][NUM_COURSE], float student_avg[]) {
    for (int i = 0; i < NUM_STUDENT; i++) {
        float sum = 0;
        for (int j = 0; j < NUM_COURSE; j++) {
            sum += scores[i][j];
        }
        student_avg[i] = sum / NUM_COURSE;
    }
}

接下来，我们需要编写一个函数来计算每门课的平均分，代码如下：

void calc_course_avg(float scores[][NUM_COURSE], float course_avg[]) {
    for (int j = 0; j < NUM_COURSE; j++) {
        float sum = 0;
        for (int i = 0; i < NUM_STUDENT; i++) {
            sum += scores[i][j];
        }
        course_avg[j] = sum / NUM_STUDENT;
    }
}

然后，我们需要编写一个函数来找出所有50个分数中最高的分数所对应的学生和课程，代码如下：

void find_highest_score(float scores[][NUM_COURSE], int& student_index, int& course_index) {
    float highest_score = -1;
    for (int i = 0; i < NUM_STUDENT; i++) {
        for (int j = 0; j < NUM_COURSE; j++) {
            if (scores[i][j] > highest_score) {
                highest_score = scores[i][j];
                student_index = i;
                course_index = j;
            }
        }
    }
}

最后，我们需要编写一个函数来计算平均分方差，代码如下：

float calc_variance(float scores[][NUM_COURSE], float student_avg[]) {
    float sum = 0;
    for (int i = 0; i < NUM_STUDENT; i++) {
        float diff = student_avg[i] - calc_student_avg(scores, student_avg)[i];
        sum += diff * diff;
    }
    return sum / NUM_STUDENT;
}

完整代码如下：

#include <iostream>

const int NUM_STUDENT = 10;
const int NUM_COURSE = 5;
float scores[NUM_STUDENT][NUM_COURSE];

void calc_student_avg(float scores[][NUM_COURSE], float student_avg[]) {
    for (int i = 0; i < NUM_STUDENT; i++) {
        float sum = 0;
        for (int j = 0; j < NUM_COURSE; j++) {
            sum += scores[i][j];
        }
        student_avg[i] = sum / NUM_COURSE;
    }
}

void calc_course_avg(float scores[][NUM_COURSE], float course_avg[]) {
    for (int j = 0; j < NUM_COURSE; j++) {
        float sum = 0;
        for (int i = 0; i < NUM_STUDENT; i++) {
            sum += scores[i][j];
        }
        course_avg[j] = sum / NUM_STUDENT;
    }
}

void find_highest_score(float scores[][NUM_COURSE], int& student_index, int& course_index) {
    float highest_score = -1;
    for (int i = 0; i < NUM_STUDENT; i++) {
        for (int j = 0; j < NUM_COURSE; j++) {
            if (scores[i][j] > highest_score) {
                highest_score = scores[i][j];
                student_index = i;
                course_index = j;
            }
        }
    }
}

float calc_variance(float scores[][NUM_COURSE], float student_avg[]) {
    float sum = 0;
    for (int i = 0; i < NUM_STUDENT; i++) {
        float diff = student_avg[i] - calc_student_avg(scores, student_avg)[i];
        sum += diff * diff;
    }
    return sum / NUM_STUDENT;
}

int main() {
    // 输入学生的成绩
    for (int i = 0; i < NUM_STUDENT; i++) {
        std::cout << "请输入第" << i + 1 << "个学生的成绩：" << std::endl;
        for (int j = 0; j < NUM_COURSE; j++) {
            std::cin >> scores[i][j];
        }
    }

    // 计算每个学生的平均分并输出
    float student_avg[NUM_STUDENT];
    calc_student_avg(scores, student_avg);
    std::cout << "每个学生的平均分是：" << std::endl;
    for (int i = 0; i < NUM_STUDENT; i++) {
        std::cout << "第" << i + 1 << "个学生的平均分是：" << student_avg[i] << std::endl;
    }

    // 计算每门课的平均分并输出
    float course_avg[NUM_COURSE];
    calc_course_avg(scores, course_avg);
    std::cout << "每门课的平均分是：" << std::endl;
    for (int j = 0; j < NUM_COURSE; j++) {
        std::cout << "第" << j + 1 << "门课的平均分是：" << course_avg[j] << std::endl;
    }

    // 找出所有50个分数中最高的分数所对应的学生和课程并输出
    int student_index, course_index;
    find_highest_score(scores, student_index, course_index);
    std::cout << "最高分数对应的学生是第" << student_index + 1 << "个学生，课程是第" << course_index + 1 << "门课。" << std::endl;

    // 计算平均分方差并输出
    float variance = calc_variance(scores, student_avg);
    std::cout << "平均分方差是：" << variance << std::endl;

    return 0;
}