C# 数组练习题及答案解析

1、根据班级人数创建一个数组，要求每个人的姓名都要放进去
Console.Write("请输入班级人数：");
int n = int.Parse(Console.ReadLine());
string[] name = new string[n];
for (int i = 0; i < n; i++)
{
Console.Write("请输入第{0}个人的姓名：", i + 1);
name[i] = Console.ReadLine();
}
Console.WriteLine("输入完毕，请按回车键查看！");
Console.ReadLine();
Console.WriteLine();
for (int i = 0; i < n; i++)
{
Console.Write(name[i] + " ");
}
Console.ReadLine();

2、从控制台输入班级人数
    将每个人的年龄放入数组，
    将所有人的年龄求总和
    求平均年龄
求年龄最大
Console.Write("请输入班级人数：");
int n = int.Parse(Console.ReadLine());
int[] age = new int[n];
int sum = 0;
for (int i = 0; i < n; i++)
{
Console.Write("请输入第{0}个人的年龄：", i + 1);
age[i] = int.Parse(Console.ReadLine());
sum += age[i];
}
Console.WriteLine("年龄总和为："+sum);
Console.WriteLine("平均年龄为："+(sum / n));
Console.ReadLine();
int agemax = 0;
for (int i = 0; i < n; i++)
{
if (agemax < age[i])
{
agemax = age[i];
}
}
Console.WriteLine("最大年龄是：" + agemax);
Console.ReadLine();

3、冒泡排序（经典）
for (int i = 0; i < n; i++)
{
for (int j = i; j < n - 1; j++)
{
if (age[i] < age[j + 1])
{
int zhong = age[i];
age[i] = age[j + 1];
age[j + 1] = zhong;
}
}
}

for (int i = 0; i < n; i++)
{
Console.WriteLine(age[i]);
}
Console.ReadLine();

4、输入班级人数
    输入每个人的分数
    求总分、平均分、两个最高分，两个最低分
Console.Write("请输入班级的人数:");
int n = int.Parse(Console.ReadLine());
double[] b = new double[n];
double fen = 0;
for (int i = 0; i < n; i++)
{
Console.Write("请输入第{0}个学生的分数：", i + 1);
b[i] = double.Parse(Console.ReadLine());
fen += b[i];
}
Console.WriteLine("总分为：" + fen);
Console.WriteLine("平均分为：" + (fen / n));
Console.ReadLine();

for (int i = 0; i < n; i++)
{
for (int j = i; j < n - 1; j++)
{
if (b[i] < b[j + 1])
{
double zhong = b[i];
b[i] = b[j + 1];
b[j + 1] = zhong;
}
}
}
Console.WriteLine("两个最高分为：" + b[0] + "," + b[1]);

Console.ReadLine();
Console.WriteLine("两个最低分为：" + b[n - 1] + "," + b[n - 2]);

Console.ReadLine();