ACUñA

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 HOA4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void TextBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void Button1_Click(object sender, EventArgs e)
        {

            double weight, height, bmi;
            if (textBox1.Text == ("") || textBox4.Text == (""))
            {
                string title = "BMI Calculator";
                MessageBox.Show("Error: Don't leave anything blank!", title);
            }
            else
            {
                weight = int.Parse(textBox1.Text);
                height = int.Parse(textBox4.Text);

                bmi = (weight * 0.45) / ((height * 0.025) * (height * 0.025));
                label8.Text = ("BMI: " + bmi);
            }

        }

        private void Label8_Click(object sender, EventArgs e)
        {


        }

        private void Button2_Click(object sender, EventArgs e)
        {

            double start, end, sum;
            if (textBox3.Text == ("") || textBox2.Text == (""))
            {
                string title = "Arithmetic Series";
                MessageBox.Show("Error: Don't leave anything blank!", title);
            }
            else
            {
                start = double.Parse(textBox3.Text);
                end = double.Parse(textBox2.Text);
                if (start > end)
                {
                    MessageBox.Show("Error: The start has to be less than the end!");
                }
                else
                {
                    sum = ((end - start) + 1) * ((start + end) / 2);
                    label7.Text = ("Sum: " + sum);
                }

            }

        }

        private void TextBox3_TextChanged(object sender, EventArgs e)
        {

        }

        private void Label7_Click(object sender, EventArgs e)
        {

        }

        private void GroupBox1_Enter(object sender, EventArgs e)
        {

        }
    }
}