There are 10 people in a group, and each person has test scores in 3 subjects. Find the average score of a single subject and the total average score of each subject of the group (including comments)

#include<stdio.h>
#include<stdlib.h>
int main()
{
	int cj[3][10], i, j;
	int aver[3] = { 0,0,0 }, s = 0;
	for (i = 0; i <= 2; i++)
		for (j = 0; j <= 9; j++)
			scanf("%d", &cj[i][j]);//首先用循环输入10个人的所有成绩
	for (i = 0; i <= 2; i++)
		for (j = 0; j <= 9; j++)
			aver[i] = aver[i] + cj[i][j];//用循环分别得到3门单科成绩的总和
	for (i = 0; i < 3; i++)
{
			aver[i] = aver[i] / 10;//分别求出三门单科成绩的平均值
	for(i=0;i<=2;i++)
	{
		printf("lesson%d:%d", i, aver[i]);//分别输出三门单科成绩的平均值
		s = s + aver[i];//将三门单科成绩的平均值相加

	} 
	printf("\naverage=%d", s / 3);//求各科总平均成绩
	system("pause");

}

Before writing code, you must first understand the meaning of the question and know the process.

The average score of a single subject: refers to the average score of 10 people in the same subject. The average of three subjects in total is required.

Total average score of each subject: Add the average scores of the three individual subjects and divide by 3.