Question

1. Create a C# app for the Hollywood Movie Rating Guide, which can be installed in a kiosk in theaters. Each theater patron enters a value from zero to for indicating the number of stars that the patron awards to the guide’s featured movie of the week. If a user enters a star value that does not fall in the correct range, prompt the user continuously until a correct value is entered. The program executes continuously until the theater manager enters a negative number to quit. At the end of the app, display the average star rating for the movie.

2. Modify the movie-rating program so that a user gets three tries to enter a valid rating. After three incorrect tries entries, the program issues an appropriate message and continues with a new user.

Answer 1

Design

Form1.Designer.cs

namespace HollywoodMovie
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.label1 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.btnrating = new System.Windows.Forms.Button();
            this.label2 = new System.Windows.Forms.Label();
            this.txtrating = new System.Windows.Forms.TextBox();
            this.lblavg = new System.Windows.Forms.Label();
            this.SuspendLayout();
            //
            // label1
            //
            this.label1.AutoSize = true;
            this.label1.Font = new System.Drawing.Font("Modern No. 20", 16.2F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label1.Location = new System.Drawing.Point(270, 44);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(401, 30);
            this.label1.TabIndex = 0;
            this.label1.Text = "Hollywood Movie Rating Guide";
            //
            // label3
            //
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(345, 168);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(232, 17);
            this.label3.TabIndex = 3;
            this.label3.Text = "Please Enter Rating Between 0 to 5";
            //
            // btnrating
            //
            this.btnrating.Location = new System.Drawing.Point(536, 108);
            this.btnrating.Name = "btnrating";
            this.btnrating.Size = new System.Drawing.Size(94, 37);
            this.btnrating.TabIndex = 4;
            this.btnrating.Text = "Rating";
            this.btnrating.UseVisualStyleBackColor = true;
            this.btnrating.Click += new System.EventHandler(this.btnrating_Click);
            //
            // label2
            //
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(272, 118);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(53, 17);
            this.label2.TabIndex = 1;
            this.label2.Text = "Rating:";
            //
            // txtrating
            //
            this.txtrating.Location = new System.Drawing.Point(348, 118);
            this.txtrating.Name = "txtrating";
            this.txtrating.Size = new System.Drawing.Size(145, 22);
            this.txtrating.TabIndex = 5;
            //
            // lblavg
            //
            this.lblavg.AutoSize = true;
            this.lblavg.Location = new System.Drawing.Point(360, 234);
            this.lblavg.Name = "lblavg";
            this.lblavg.Size = new System.Drawing.Size(46, 17);
            this.lblavg.TabIndex = 6;
            this.lblavg.Text = "label4";
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(1015, 463);
            this.Controls.Add(this.lblavg);
            this.Controls.Add(this.txtrating);
            this.Controls.Add(this.btnrating);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Button btnrating;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox txtrating;
        private System.Windows.Forms.Label lblavg;
    }
}

Coding

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 HollywoodMovie
{
    public partial class Form1 : Form
    {
        double rating,total=0,count=0,error_count=0;
        double avg;
        public Form1()
        {
            InitializeComponent();
        }

        private void btnrating_Click(object sender, EventArgs e)
        {
            rating = Convert.ToDouble(txtrating.Text);//here rating value in variable
            if (rating > 0 && rating <= 5)//check if it is between 0 to 5
            {
                total += rating;//total calculate
                count++;//count increment
                txtrating.Text = "";//here is textbox blank
            }
            else if (rating < 0)//if value is negative then manager then average display
            {
                avg = total / count;
                lblavg.Text = "Average is here ="+Convert.ToString(avg);//display here
                txtrating.Text = "";//here is textbox blank
            }
            else
            {
                error_count++;
                if (error_count == 3)//check if three time
                {
                MessageBox.Show("Continues with a new user");//message for new message here
                error_count = 0;
                }
                txtrating.Text = "";//here is textbox blank
            }
          }

        private void Form1_Load(object sender, EventArgs e)
        {
            lblavg.Text = "";//null value in load time
        }
    }
}

output:

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