C语言数组求每门课的成绩的最值，及每个学生的平均成绩。（平均成绩排序输出）

 这是基本代码，题主可以参考下

#include <stdio.h>

int main()
{
 int i; 
 float score[5],all = 0,avg = 0;
 printf("请输入这五位学生的成绩：\n");
 for(i = 0; i < 5; i++)
  scanf("%f",&score[i]); 
    float max=score[0],min=score[0];
 for(i = 0; i < 5; i++)
 {   
  all += score[i];   
  if(score[i]>max)
   max = score[i];  
  if(score[i]<min)
   min = score[i];
 }  
 avg=all/5;
 printf("总成绩:%g\n平均成绩:%3.2f\n最大值:%g\n最小值:%g\n",all,avg,max,min) 

return 0;

}

https://blog.csdn.net/weixin_45391986/article/details/105919562,这个对你一定有帮助，很多这样的案例

符合要求，直接用

#include <stdio.h>

typedef struct _student
{
	int nID;
	float fYW;
	float fSX;
	float fWY;
	float avg;
}student;
int main()
{
	student stu[100];
	int i, n, m = 0;
	float sum = 0;
	printf("请输入学生人数：");
	scanf_s("%d", &n);
	printf("\n");
	for (i = 0; i < n; i++)
	{
		printf("请输入第%d个学生成绩（学号,语文,数学,英语）：", i + 1);
		scanf_s("%d,%f,%f,%f", &stu[i].nID, &stu[i].fYW, stu[i].fSX, stu[i].fWY);
		stu[i].avg = (stu[i].fYW + stu[i].fSX + stu[i].fWY) / 3;
	}
	float maxYW = stu[0].fYW;
	float minYW = stu[0].fYW;
	float maxSX = stu[0].fSX;
	float minSX = stu[0].fSX;
	float maxWY = stu[0].fWY;
	float minWY = stu[0].fWY;
	for (i = 1; i < n; i++)
	{
		if (maxYW < stu[i].fYW)
			maxYW = stu[i].fYW;
		if (maxWY < stu[i].fWY)
			maxWY = stu[i].fWY;
		if (maxSX < stu[i].fSX)
			maxSX = stu[i].fSX;
		if (minYW > stu[i].fYW)
			minYW = stu[i].fYW;
		if (minWY > stu[i].fWY)
			minWY = stu[i].fWY;
		if (minSX > stu[i].fSX)
			minSX = stu[i].fSX;
	}
	for (i = 0; i < n - 1; i++)
	{
		for (int j = 1; i < n; j++)
		{
			if (stu[j - 1].avg < stu[j].avg)
			{
				student s = stu[j - 1];
				stu[j - 1] = stu[j];
				stu[j] = s;
			}
		}
	}
	printf("学号\t数学\t语文\t外语\t平均分\n");
	for (i = 0; i < n; i++)
	{
		printf("%d\t%.1f\t%.1f\t%.1f\t%.1f\n", stu[i].nID, stu[i].fSX, stu[i].fYW, stu[i].fWY, stu[i].avg);
	}
	printf("最高分\t%.1f\t%.1f\t%.1f\n", maxSX, maxYW, maxWY);
	printf("最低分\t%.1f\t%.1f\t%.1f\n", minSX, minYW, minWY);
}

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