การบ้านครั้งที่6

ข้อที่ 5.3
using System;
namespace CalculateInterest
{
    class Program
    {
        static void Main(){
        Console.Write("Enter principal: ");
        string sPrincipal = Console.ReadLine();
        decimal mPrincipal = Convert.ToDecimal(sPrincipal);
        if (mPrincipal <0)
        {
            Console.WriteLine("Principal cannot be negative");
            mPrincipal = 0;
        }
        Console.Write("Enter interest: ");
        string sInterest = Console.ReadLine();
        decimal mInterest = Convert.ToDecimal(sInterest);
        if (mInterest < 0)
        {
            Console.WriteLine("Interest cannot be negative");
            mInterest = 0;
        }
        decimal mInterestPaid;
        mInterestPaid = mPrincipal * (mInterest / 100);
        decimal mTotal = mPrincipal + mInterestPaid;
        Console.WriteLine();
        Console.WriteLine("Principal ="+ mPrincipal);
        Console.WriteLine("Interest ="+ mInterest + "%");
        Console.WriteLine();
        Console.WriteLine("Interest paid =" + mInterestPaid);
        Console.WriteLine("Total ="+mTotal);
        Console.WriteLine("Press Enter to terminnate...");
        Console.ReadLine();
        }
    }
}

ข้อที่5.13
using System;
namespace CalculateInterestTableMoreForgiving{
    class Program {
        static void Main(string[] args) {
            int nMaximumInterest = 50;
            decimal mPrincipal;
            while(true)
            {
                Console.Write("Enter principal");
                string sPrincipal = Console.ReadLine();
                mPrincipal = Convert.ToDecimal(sPrincipal);
                if(mPrincipal >= 0)
                {
                    break;}
            }
            Console.WriteLine("Principal cannot be negatine");
            Console.WriteLine("Try again");
            Console.WriteLine();
            decimal mInterest;
            while(true)
            {
                Console.Write("Enter interest: ");
                string sInterest = Console.ReadLine();
                mInterest = Convert.ToDecimal(sInterest);
                if (mInterest >= 0 && mInterest <= nMaximumInterest)
                {
                    break;
                }
                Console.WriteLine("Interest cannot be negative " + "or greater than " + nMaximumInterest);
                Console.WriteLine("Try again");
                Console.WriteLine();
            }
            Console.Write("Enter number of years: ");
            string sDuration = Console.ReadLine();
            int nDurstion = Convert.ToInt32(sDuration);
            Console.WriteLine();
            Console.WriteLine("Principal =" + mPrincipal);
            Console.WriteLine("Interest =" + mInterest + "%");
            Console.WriteLine("Duration =" + nDurstion + "years");
            Console.WriteLine();
            int nyear =1;
            while (nyear <= nDurstion);
            {
                decimal mInterestPaid;
                mInterestPaid = mPrincipal * (mInterest / 100);
                mPrincipal = mPrincipal + mInterestPaid;
                mPrincipal = decimal.Round(mPrincipal, 2);
                Console.WriteLine(nyear +" - " + mPrincipal);
                nyear = nyear +1;
            }
            Console.WriteLine("Press Enter to terminate...");
            Console.Read();
        }
    }
}







ข้อที่7.7
using System;
namespace studentname
{
    class student
    {
        private int idNumber;
        private string lastName;
        private double gradePointAversge;
        public int getld()
        {
            return idNumber;
        }
        public string getName()
        {
            return lastName;
        }
        public double getGPA()
        {
            return gradePointAversge;
        }
        public void setLd(int id)
        {
            idNumber = id;
        }
        public void setName(string name)
        {
            lastName = name;
        }
        public void setGPA(double gpa)
        {
            gradePointAversge = gpa;
        }
        class Program
        {
            static void Main()
            {
                student st = new student();
                st.setLd(9353);
                st.setName("Teerawat");
                st.setGPA(3.98);
                Console.WriteLine("Student name {0} has ID # {1} and gpa of{2}",
                    st.getName(), st.getld(), st.getGPA());
                Console.ReadLine();
            }
        }
    }
}


ข้อที่ 8.6


using System;
namespace UserPredefineMethods
{
    static class Program
    {
        static void Main()
        {
            double[] waterDepht = { 45, 19, 2, 16.8, 190, 0.8, 510, 6, 18 };
            string outputMsg = "";
            string caption = "System.Array Methods IIIustrated";
            double[] w = new double[20];
            outputMsg += "waterDepth Array\n\n";
            foreach (double wVal in waterDepht)
                outputMsg += wVal + "\n";
            MessageBox.Show(outputMsg, caption);
            Array.Copy(waterDepht, 2, w, 0, 5);
            Array.Sort(w);
            outputMsg = "Array w Sorted\n\n";
            foreach (double wVal in w)
            {
                if (wVal > 0)
                    outputMsg += wVal + "\n";
            }
            MessageBox.Show(outputMsg, caption);
            Array.Reverse(w);
            outputMsg = "Array w Reversed\n\n";
            foreach (double wVal in w)
            {
                if (wVal > 0)
                    outputMsg += wVal + "\n";
            }
            MessageBox.Show(outputMsg, caption);
        }
    }
}