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overlord13372020-05-30 11:38:04
overlord1337, 2020-05-30 11:38:04
How to display the highest sum of grades from each school from a file?
I was given this task in class, I don't know how to do it.
Task: The student's questionnaire includes the last name, first name, school number, grades in two subjects. Enter data for several students and display the best student in terms of the sum of marks for each school.
What is the best way to do this task? I tried to make it like this:
namespace файлы
{
struct TPeople
{
public string LastName;
public string Name;
public int school;
public int one;
public int two;
}
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
TB_1.ColumnCount = 5;
TB_1.RowCount = Convert.ToInt32(numericUpDown1.Value);
}
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
TB_1.RowCount = Convert.ToInt32(numericUpDown1.Value);
}
private void button1_Click(object sender, EventArgs e)
{
TPeople people;
using (BinaryWriter bw = new BinaryWriter(File.Open("data.dat", FileMode.Create)))
{
for (int i = 0; i < TB_1.RowCount; i++)
{
people.LastName = Convert.ToString(TB_1[0, i].Value);
people.Name = Convert.ToString(TB_1[1, i].Value);
people.school = Convert.ToInt32(TB_1[2, i].Value);
people.one = Convert.ToInt32(TB_1[3, i].Value);
people.two = Convert.ToInt32(TB_1[4, i].Value);
bw.Write(people.LastName);
bw.Write(people.Name);
bw.Write(people.school);
bw.Write(people.one);
bw.Write(people.two);
}
}
}
private void button2_Click(object sender, EventArgs e)
{
TPeople[] peoples = new TPeople[0];
int n = 0;
using (BinaryReader br = new BinaryReader(File.Open("data.dat", FileMode.Open)))
{
while (br.PeekChar() != -1)
{
Array.Resize(ref peoples, ++n);
peoples[n - 1].LastName = br.ReadString();
peoples[n - 1].Name = br.ReadString();
peoples[n - 1].school = br.ReadInt32();
peoples[n - 1].one = br.ReadInt32();
peoples[n - 1].two = br.ReadInt32();
}
}
TB_2.RowCount = n;
for (int i = 0; i < n; i++)
{
TB_2[0, i].Value = peoples[i].LastName;
TB_2[1, i].Value = peoples[i].Name;
TB_2[2, i].Value = peoples[i].school;
TB_2[3, i].Value = peoples[i].one;
TB_2[4, i].Value = peoples[i].two;
}
int b = 0;
int sum = peoples[0].one + peoples[0].two;
TB_3.RowCount++;
TB_3[0, TB_3.RowCount - 1].Value = peoples[0].LastName;
TB_3[1, TB_3.RowCount - 1].Value = peoples[0].Name;
TB_3[2, TB_3.RowCount - 1].Value = peoples[0].school;
TB_3[3, TB_3.RowCount - 1].Value = sum;
for (int i = 0; i < n; i++)
{
sum = peoples[i].one + peoples[i].two;
for (int k = 0; k < TB_3.RowCount; k++)
{
int l = Convert.ToInt32(TB_3[2, k].Value);
if (k == TB_3.RowCount + 1 && peoples[i].school != l)
{
TB_3.RowCount++;
TB_3[0, TB_3.RowCount - 1].Value = peoples[i].LastName;
TB_3[1, TB_3.RowCount - 1].Value = peoples[i].Name;
TB_3[2, TB_3.RowCount - 1].Value = peoples[i].school;
TB_3[3, TB_3.RowCount - 1].Value = sum;
}
else
{
if (b == 1)
{ break; }
if (peoples[i].school == l)
{
if (i != 0)
{
int p = Convert.ToInt32(TB_3[3, TB_3.RowCount - 1].Value);
if (sum == p && peoples[i].LastName != Convert.ToString(TB_3[0, k].Value) && peoples[i].Name != Convert.ToString(TB_3[1, k].Value))
{
TB_3.RowCount++;
TB_3[0, TB_3.RowCount - 1].Value = peoples[i].LastName;
TB_3[1, TB_3.RowCount - 1].Value = peoples[i].Name;
TB_3[2, TB_3.RowCount - 1].Value = peoples[i].school;
TB_3[3, TB_3.RowCount - 1].Value = sum;
}
else { break; }
}
}
for (int j = 1; j < n; j++)
{
if (i == 0)
{
if (i + j == n)
{ break; }
if (peoples[i].school == peoples[i + j].school)
{
if (sum < peoples[i + j].one + peoples[i + j].two)
{
sum = peoples[i + j].one + peoples[i + j].two;
TB_3[0, TB_3.RowCount - 1].Value = peoples[i + j].LastName;
TB_3[1, TB_3.RowCount - 1].Value = peoples[i + j].Name;
TB_3[2, TB_3.RowCount - 1].Value = peoples[i + j].school;
TB_3[3, TB_3.RowCount - 1].Value = sum;
}
else
{
sum = peoples[i].one + peoples[i].two;
TB_3[0, TB_3.RowCount - 1].Value = peoples[i].LastName;
TB_3[1, TB_3.RowCount - 1].Value = peoples[i].Name;
TB_3[2, TB_3.RowCount - 1].Value = peoples[i].school;
TB_3[3, TB_3.RowCount - 1].Value = sum;
continue;
}
if (i == n - 1)
{
TB_3.RowCount++;
sum = peoples[i].one + peoples[i].two;
TB_3[0, TB_3.RowCount - 1].Value = peoples[i].LastName;
TB_3[1, TB_3.RowCount - 1].Value = peoples[i].Name;
TB_3[2, TB_3.RowCount - 1].Value = peoples[i].school;
TB_3[3, TB_3.RowCount - 1].Value = sum;
b += 1;
break;
}}}
else{
if (i + j == n)
{ break; }
if (peoples[i].school == peoples[i + j].school)
{
if (sum < peoples[i + j].one + peoples[i + j].two)
{
sum = peoples[i + j].one + peoples[i + j].two;
TB_3[0, TB_3.RowCount - 1].Value = peoples[i + j].LastName;
TB_3[1, TB_3.RowCount - 1].Value = peoples[i + j].Name;
TB_3[2, TB_3.RowCount - 1].Value = peoples[i + j].school;
TB_3[3, TB_3.RowCount - 1].Value = sum;
}
else
{
TB_3.RowCount++;
sum = peoples[i].one + peoples[i].two;
TB_3[0, TB_3.RowCount - 1].Value = peoples[i].LastName;
TB_3[1, TB_3.RowCount - 1].Value = peoples[i].Name;
TB_3[2, TB_3.RowCount - 1].Value = peoples[i].school;
TB_3[3, TB_3.RowCount - 1].Value = sum;
continue;
}
}
}
} continue;
}
}
}
}
}
} 1 answer(s)
@firedragon
V
Vladimir Korotenko, 2020-05-30 @firedragon
void Test()
{
var peoples = new People[]
{
new People{LastName = "Ivanov", Name = "Ivan", School = 17, One = 5, Two = 4},
new People{LastName = "Petrov", Name = "Petr", School = 17, One = 5, Two = 3},
new People{LastName = "Dariyana", Name = "Daria", School = 17, One = 5, Two = 4},
new People{LastName = "Ivanov", Name = "Ivan", School = 16, One = 5, Two = 4},
new People{LastName = "Petrov", Name = "Petr", School = 16, One = 5, Two = 3},
new People{LastName = "Dariyana", Name = "Daria", School = 16, One = 5, Two = 4},
new People{LastName = "Dariyana", Name = "Daria", School = 19, One = 2, Two = 2},
};
var path = "file.xml";
Save(path,peoples);
peoples = Load(path);
var schoolList = peoples.Select(s => s.School).Distinct();
var best =
(from sn in schoolList let max = peoples.Where(s => s.School == sn)
.Max(x => x.One + x.Two)
select
peoples.First(x => x.School == sn && (x.One + x.Two) == max))
.ToList();
;
}
private static People[] Load(string path)
{
var formatter = new XmlSerializer(typeof(People[]));
using var fs = new FileStream(path, FileMode.OpenOrCreate);
var peoples = (People[])formatter.Deserialize(fs);
return peoples;
}
private static void Save(string path, People[] peoples)
{
var formatter = new XmlSerializer(typeof(People[]));
using var fs = new FileStream(path, FileMode.OpenOrCreate);
formatter.Serialize(fs, peoples);
}
[Serializable]
public class People
{
public string LastName { get; set; }
public string Name { get; set; }
public int School { get; set; }
public int One { get; set; }
public int Two { get; set; }
}
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