bài tập trên trường-1

Duynguyen1819 commented 3 years ago

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int soluongkitu = 3;
            char[] danhsachkitu = new char[soluongkitu];
            for (int i = 0; i < soluongkitu; i++)
            {
                Console.Write("ki tu thu {0}:", i);
                danhsachkitu[i]= Console.ReadKey().KeyChar;
                Console.WriteLine();
            }
            for (int i = soluongkitu - 1; i >= 0; i--)
            {
                Console.Write(danhsachkitu[i]);
            }
        }
    }
}

nhokhacam1 commented 3 years ago

bài 2
using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            string correctUsername = "nhom2";
            string correctPasswword = "nhom2345";
            string username, password;
            int solannhap = 0;
            do {
                if (solannhap > 0)
                {
                    Console.WriteLine("Nhap lai: ");
                }
                // nhap username va password
                Console.WriteLine("nhap username");
                username = Console.ReadLine();
                Console.WriteLine("nhap passwword");
                password = Console.ReadLine();
                solannhap++;
            } while (!(username == correctUsername && password == correctPasswword)&&(solannhap<3));
            if (solannhap == 3)
            {
                Console.WriteLine("Error:nhap sai tai khoan");
            }
            else
            {
                Console.WriteLine("dang nhap thanh cong");
            }
        }
    }
}

Duynguyen1819 commented 3 years ago

using System;
using System.Security.Cryptography;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            double a, b, c, x1, x2, x;
            double delta;
            // nhap vao a, b, c
            do
            {
                Console.Write("a:");
                a = double.Parse(Console.ReadLine());
            }
            while (a == 0);
            Console.Write("b:");
            b = double.Parse(Console.ReadLine());
            Console.Write("c:");
            c = double.Parse(Console.ReadLine());
            // tinh delta
            delta = Math.Pow(b, 2) - 4 * a * c;
            // xét nghiem
            if (delta ==0)
            {
                x = -b /( 2 * a);
                Console.WriteLine("x1 = x2 ={0}",x );
            }
            else if (delta > 0)
            {
                x1 = (-b - Math.Sqrt(delta)) / (2 * a);
                x2 = (-b + Math.Sqrt(delta)) / (2 * a);
                Console.WriteLine("x1 = {0}, x2 = {1}", x1, x2); 
            }
            else
            {
                Console.WriteLine("phuong trinh vo nghiem");

            }

        }
    }
}

ITHelpself commented 3 years ago


using System;
using System.ComponentModel.DataAnnotations;
namespace ConsoleApp1
{
    class Program
    { 
        static int giaithua(int n)
        {
            if (n == 0)
            {
                return 1;
            }
            else
                return n * giaithua(n - 1);
        }
        static int tongLe(int n)
        {
            int tong = 0;
            for(int i = 1; i <= n; i += 2)
            {
                tong += i;
            }
            return tong;
        }
        static void inBangNhan(int n)
        {
            for(int i = 1; i <= 10; i++)
            {
                Console.WriteLine("{0} * {1} = {2}", n, i, n * i);
            }
        }
        static void Main(string[] args)
        {

        }
    }
}

nhokhacam1 commented 3 years ago

bài 4
using System;

namespace ConsoleApp1
{
    class Program
    {
        static double tinhDienTichHinhTron(double r)
        {
            return Math.PI * Math.Pow(r, 2);
        }
        static double tinhDienTichHinhChuNhat(double dai,double rong)
        {
            return dai * rong;
        }
        static double tinhDienTichHinhTamGiac(double a , double b , double c)
        {
            double nuachuvi = (a + b + c) / 2;
            double dientich = Math.Sqrt(nuachuvi * (nuachuvi - a) * (nuachuvi - b) * (nuachuvi - c));
            return dientich;
        }
        static void menu ()
        {
            int luachon = 0;
            double dientich = 0;
            Console.WriteLine("---------------------Menu-------------");
            Console.WriteLine("-----1:tinh dien tich hinh tron-------");
            Console.WriteLine("-----2:tinh dien tich hinh chu nhat-------");
            Console.WriteLine("-----3:tinh dien tich hinh tam giac-------");
            Console.Write("nhap lua chon:");
            luachon = int.Parse(Console.ReadLine());
            switch (luachon)
            {
                case 1:
                    double r = 0;
                    //TODO: dien tich hinh tron
                    Console.WriteLine("nhap ban kinh r:");
                    r = double.Parse(Console.ReadLine());
                    dientich = tinhDienTichHinhTron(r);
                    break;
                case 2:
                    double x = 0, y = 0;
                    // TODO:dien tich hinh chu nhat
                    Console.WriteLine("nhap chieu dai x:");
                    x = double.Parse(Console.ReadLine());
                    Console.WriteLine("nhap chieu rong y:");
                    y = double.Parse(Console.ReadLine());
                    dientich = tinhDienTichHinhChuNhat(x, y);
                    break;
                case 3:
                    double a = 0, b = 0, c = 0;
                    Console.WriteLine("nhap chieu dai canh a:");
                    a = double.Parse(Console.ReadLine());
                    Console.WriteLine("nhap chieu dai canh b:");
                    b = double.Parse(Console.ReadLine());
                    Console.WriteLine("nhap chieu dai canh c:");
                    c = double.Parse(Console.ReadLine());
                    //TODO dien tich hinh tam giac
                    dientich = tinhDienTichHinhTamGiac(a, b, c);
                    break;
                default:
                    Console.WriteLine("vui long chon phep tinh 1 hoac 2 hoac 3");
                    break;
            }
            Console.WriteLine("dientich: " + dientich);

        }
        static void Main(string[] args)
        {
            menu();
        }
    }
}

Duynguyen1819 commented 3 years ago

using System;
using System.Security.Cryptography;

namespace ConsoleApp1
{
    class Program
    {
        static double tinhTong(double a, double b)
        {
            return a + b;
        }
        static double tinhHieu(double a, double b)
        {
            return a - b;
        }
        static double tinhTich(double a, double b)
        {
            return a * b;
        }
        static double tinhThuong(double a, double b)
        {
            return a / b;
        }
        static void menu()
        {
            int luachon;
            double a, b;
            Console.Write("a:");
            a = double.Parse(Console.ReadLine());
            Console.Write("b:");
            b = double.Parse(Console.ReadLine());

            Console.WriteLine("------------menu-----------");
            Console.WriteLine("1 tong");
            Console.WriteLine("2 hieu");
            Console.WriteLine("3 tich");
            Console.WriteLine("4 thuong");
            // nhap lua chon
            luachon = int.Parse(Console.ReadLine());
            switch (luachon)
            {
                case 1:
                    //TODO: tong
                    double tong = tinhTong(a, b);
                    Console.WriteLine("tong = {0}",tong);
                    break;
                case 2:
                    //TODO: hieu
                    double hieu = tinhHieu(a, b);
                    Console.WriteLine("hieu = {0}",hieu);
                    break;
                case 3:
                    //TODO: tich
                    double tich = tinhTich(a, b);
                    Console.WriteLine("tich = {0}",tich);
                    break;
                case 4:
                    //TODO: thuong
                    double thuong = tinhThuong(a, b);
                    Console.WriteLine("thuong = {0}",thuong);
                    break;
            }
        }
        static void Main(string[] args)
        {
            menu();

        }
    }
}

ThanhPhong212 commented 3 years ago

slide trang 56


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace lop6
{
    class Box
    {
        public double chieu_dai;
        public double chieu_rong;
        public double chieu_cao;
        static void Main(string[] args)
        {
            Console.WriteLine("Class trong c#");
            Console.WriteLine("---------------------------------\n");
            Box box1 = new Box();
            Box box2 = new Box();
            double thetich = 0.0;
            box1.chieu_cao = 5.0;
            box1.chieu_dai =6.0;
            box1.chieu_rong = 7.0;

            box2.chieu_cao = 5.0;
            box2.chieu_dai = 6.0;
            box2.chieu_rong = 7.0;

            thetich = box1.chieu_cao * box1.chieu_dai * box1.chieu_rong;
            Console.WriteLine("The tich cua box 1: {0}", thetich);
            thetich = box2.chieu_cao * box2.chieu_dai * box2.chieu_rong;
            Console.WriteLine("The tich cua box 2: {0}", thetich);
            Console.ReadKey();
        }
    }
}

ThanhPhong212 commented 3 years ago

slide 59


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace lop6
{
    class Box
    {
        public double chieu_dai;
        public double chieu_rong;
        public double chieu_cao;

        public void setChieudai(double len)
        {
            chieu_dai = len;
        }
        public void setChieurong(double bre)
        {
            chieu_rong = bre;
        }
        public void setChieucao(double hei)
        {
            chieu_cao= hei;
        }
        public double tinhtheTich()
        {
            return chieu_dai * chieu_rong * chieu_cao;
        }
        public static void main(string[] args)
        {
            Box box1 = new Box();
            Box box2 = new Box();
            double the_tich;
            box1.setChieurong(6.0);
            box1.setChieudai(7.0);
            box1.setChieucao(5.0);
            box2.setChieurong(12.0);
            box2.setChieudai(13.0);
            box2.setChieucao(10.0);
            the_tich = box1.tinhtheTich();
            Console.WriteLine("the tich box1: {0}", the_tich);
            the_tich = box2.tinhtheTich();
            Console.WriteLine("the tich box2: {0}", the_tich);
            Console.ReadKey();
        }
    }
}

ITHelpself / CSharp-team-lttq

bài tập trên trường-1 #8