设学生人数 N=8，提示用户输入 N 个人的考试成绩，然后计

解：

源程序：

#include <iostream.h>
#include <string.h>
#define N 8
float grades[N]; //存放成绩的数组
void main()
{
int i;
float total,average;
//提示输入成绩
for(i = 0; i < N; i++ )
{
cout << "Enter grade #" <<(i +1) << ": ";
cin >> grades[i];
}
total = 0;
for (i = 0; i < N; i++)
total += grades[i];
average = total / N;
cout << "\nAverage grade: " << average << endl;
}