作业问题，请帮忙！ [英] homework question,help please!

问题描述

嗨伙计..

i不能竞争这个节目，为什么？

Q是：写一个程序，取5个学生的分数并显示平均值，我'我完成了这一部分：

..............

课程计划
 {
 struct st1 
 {
。 
。 
 int i; 
双倍金额，平均; 
 string st; 
 int n; 
 console.write（你有几个学生？）; 
 st = console.readline（）; 
 n = convert.ToInt32（st）; 
 st1 [] s = new st1 [n]; 
 for（i = 0; i< n; i ++）> 
 {
 console.write（student）; 
 console.writeline（i + 1）; 
 console.write（输入学生ID：）; 
 st = console.readline（）; 
 s（i）.ID = convert.ToInt32（st）; 
 console.write（输入学生姓名：）; 
 s（i）.name = console.readline（）; 
 console.write（输入student score：）; 
 st = console.readline（）; 
 s（i）.number = convert.ToDouble（st）; 
} 
 sum = 0; 
 for（i = 0; i< n; i ++）> 
 sum + = a（i）.score; 
 avg = sum / n; 
 console.write（average：）; 
 console.writeline（avg）; 
 console.readline（）; 
} 
 ............. 

和Q的另一部分说完了这一切之后学生的信息根据从最大到最小的分数。

你可以帮助我完成这个，请... .. div class =h2_lin>解决方案

有一个（相对）简单的方法：你可以使用内置的Array.Sort方法。



创建一个Comparer方法：

  private   static   int  CompareEm（st1 s1，st1 s2）
 {
  return  s2.number  -  s1.number; 
} 

然后：

 Array.Sort（st1，CompareEm）; 
 

BTW：使用非常短的变量名称是个坏主意，特别是使用与您声明的类相同的变量名称它作为。使用更长的名称：它使你的代码更具可读性，Intellisense帮助你输入它们，所以它真的如此快，如果不是更快！

这是OriginalGriff固体解决方案的一个细微变化，使用Lambda表示法，对于就地降序对象排序为Array [Object]：

 Array.Sort（学生，（student1，student2）=> student2.Score  -  student1.Score）; 

hi guys..
i cant compelete this program, why??
the Q is:write a program that take 5 students's score and display the average,i've done this part:
..............

class program
{
struct st1
{
.
.
int i;
double sum,avg;
string st;
int n;
console.write("How many students do you have?");
st=console.readline();
n=convert.ToInt32(st);
st1[] s=new st1[n];
for(i=0;i<n;i++)>
{
console.write("student ");
console.writeline(i+1);
console.write("enter student ID:");
st=console.readline();
s(i).ID=convert.ToInt32(st);
console.write("enter student name:");
s(i).name=console.readline();
console.write("enter student score:");
st=console.readline();
s(i).number=convert.ToDouble(st);
}
sum=0;
for(i=0;i<n;i++)>
sum+=a(i).score;
avg=sum/n;
console.write("average:");
console.writeline(avg);
console.readline();
}
.............

and the other part of the Q says after all this sort the informations of the students according to scores from greatest to smallest.
can you help me to compelete this ,please..

解决方案

There is a (relatively) simple way to do it: you can use the built in Array.Sort method.

Create a Comparer method:

private static int CompareEm(st1 s1, st1 s2)
    {
    return s2.number - s1.number;
    }

And then:

Array.Sort(st1, CompareEm);

BTW: It's a poor idea to use very short variable names, and especially poor to use a variable name that is the same as the class you have declared it as. Use longer names: it makes your code a lot more readable, and Intellisense helps you type them so it really is as fast if not faster!

Here's a slight variation of OriginalGriff's solid solution, using Lambda notation, for an in-place-descending object sort of an Array[Object]:

Array.Sort(Students, (student1, student2) => student2.Score - student1.Score);

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