[C#] 20일차 - 143. 콤보박스를 이용한 학점계산기

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace A143_GradeCalc
{
    public partial class Form1 : Form
    {
        TextBox[] titles; // 교과목 TextBox배열
        ComboBox[] crds; // 학점 ComboBox배열
        ComboBox[] grds; // 성적 ComboBox배열

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            txt1.Text = "인체의구조와 기능1";
            txt2.Text = "일반수학1";
            txt3.Text = "디지털공학및실험";
            txt4.Text = "자료구조";
            txt5.Text = "비주얼프로그래밍";
            txt6.Text = "기업가정신";

            crds = new ComboBox[] { crd1, crd2, crd3, crd4, crd5, crd6, crd7 };
            grds = new ComboBox[] { grd1, grd2, grd3, grd4, grd5, grd6, grd7 };
            titles = new TextBox[] { txt1, txt2, txt3, txt4, txt5, txt6, txt7 };
            int[] arrCredit = { 1, 2, 3, 4, 5 };
            List<String> lstGrade = new List<string> { "A+", "A0", "B+", "B0", "C+", "C0", "D+", "D0", "F" };

            foreach (var combo in crds)
            {
                foreach (var i in arrCredit)
                    combo.Items.Add(i);
                combo.SelectedItem = 3;
            }

            foreach(var cb in grds)
            {
                foreach (var i in lstGrade)
                    cb.Items.Add(i);
            }
               
        }

        // 버튼을 누르면 평균구해지고 return
        private void button1_Click(object sender, EventArgs e)
        {
            double totalScore = 0;
            int totalCredits = 0;

            for(int i = 0; i<crds.Length; i++)
            {
                if(titles[i].Text != "")
                {
                    int crd = int.Parse(crds[i].SelectedItem.ToString());
                    totalCredits += crd;
                    totalScore += crd * GetGrade(grds[i].SelectedItem.ToString());
                }
            }
            txtGrade.Text = (totalScore / totalCredits).ToString("0.00");

        }

        // 학점 return
        private double GetGrade(string text)
        {
            double grade = 0;

            if (text == "A+") grade = 4.5;
            else if (text == "A0") grade = 4.0;
            else if (text == "B+") grade = 3.5;
            else if (text == "B0") grade = 3.0;
            else if (text == "C+") grade = 2.5;
            else if (text == "C0") grade = 2.0;
            else if (text == "D+") grade = 1.5;
            else if (text == "D0") grade = 1.0;
            else grade = 0;
            return grade;
        }
    }
}