#define _CRT_SECURE_NO_WARNINGS
#define M 10  //学生数
#define N 5   //课程数
#include<stdio.h>
float avg_stu[M] = { 0 };
float avg_course[N] = { 0 };
float highest = 0.0;
float variance = 0.0;
int stu_index, course_index;//最高分学生的课程下标
void avg_score_stu(float score [M][N])
{
	int i = 0;
	int j = 0;
	float sum = 0.0;
	for (i = 0; i < M; i++)
	{
		sum = 0.0;
		for (j = 0; j < N; j++)
		{
			sum += score[i][j];
		}
		avg_stu[i] = sum / N;
	}
}
void avg_score_course(float score[M][N])
{
	int i = 0;
	int j = 0;
	float sum = 0.0;
	for (i = 0; i < N; i++)
	{
		sum = 0.0;
		for (j = 0; j < M; j++)
		{
			sum += score[j][i];
		}
		avg_course[i] = sum / M;
	}
}
//计算最高分；
float highest_score(float score[M][N])
{
	float highest = 0.0;
	int i = 0;
	int j = 0;
	for (i = 0; i < M; i++)
	{

		for (j = 0; j < N; j++)
		{
			if (score[i][j] > highest)
			{
				highest = score[i][j];
				stu_index = i;
				course_index = j;
			}
		}
	}
	return highest;
}
//平均分的方差
float variance_avg_score()
{
	int i = 0;
	int j = 0;
	float sum_avg_square = 0.0;//平均分平方和
	float sum_avg_score=0.0;//平均分和
	for (i = 0; i < M; i++)
	{
		sum_avg_square += avg_stu[i] * avg_stu[i];
		sum_avg_score += avg_stu[i];
	}
	return sum_avg_square / M - (sum_avg_score / M) * (sum_avg_score / M);
}
void print_result(float score[M][N])
{
	printf("N0   cour1     cour2     cour3     cour4     cour5     avger\n");
	int i = 0;
	int j = 0;
	for (i = 0; i < M; i++)
	{
		printf("N%-5d", i + 1);
		for (j = 0; j < N; j++)
		{
			printf("%-9.1f ", score[i][j]);
		}
		printf("%-9.1f\n",avg_stu[i]);
	}
	//显示每一门课的平均分
	printf("%-5s  ", "avg");
	for (i = 0; i < N; i++)
	{
		printf("%-9.1f", avg_course[i]);
	}
	printf("\n");
	printf("最高分为：%.1f,是第%d位同学的第%d门课程\n", highest, stu_index+1, course_index+1);
	printf("平均分的方差：%.1f",variance);
}
int main()
{
	float score[M][N] =
	{
		{1,2,3,4,5},
		{2,3,4,5,6},
		{3,4,5,6,7},
		{4,5,6,7,8},
		{5,6,7,8,9},
		{6,7,8,9,1},
		{7,8,9,1,2},
		{8,9,1,2,3},
		{9,1,2,3,4},
		{1,3,5,7,9}
	};
    //计算每个学生的平均分
	avg_score_stu(score);
	//计算每个课程的平均分
	avg_score_course(score);
	highest = highest_score(score);
	variance=variance_avg_score();
	print_result(score);
	return 0;
}