温度建议应用

Question

第一个问题。任何建议都有帮助。

这是为了一堂课，尽管我正试图自己去理解。我在编写代码时遇到了一些语法错误。这个控制台应用程序的目标是让用户能够输入一个温度，并有一个建议，因为什么衣服是必要的(即“穿上一件轻型夹克”)。

在此之前，我已经完成了温度转换应用程序，并将我的代码添加到通知应用程序中。我看过其他示例，也没有找到类似于这样的if...else语句的简洁示例。

我认为这个错误是因为变量不是布尔变量，但我不知道如何将它转换为布尔值，只用于if else语句。

到目前为止，这就是我所拥有的：

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

namespace ConsoleF_to_C_App
{
    class Program
    {
        static void Main(string[] args)
        {
            //declare a char variable to store the degree symbol
            char chrDegree = (char)176;

            //display program info
            Console.WriteLine("Temperature Conversions with Advice (v.1) Sept 17, 2015");
            Console.WriteLine("-------------------------------------------------------\n\n");
            //prompt user to enter the temperature in F
            Console.Write("Enter today's temperature in {0} F (eg 60): ", chrDegree);

            //read in the user input
            string strF = Console.ReadLine();

            //declare two doubles to store F and C temperature
            double dblF, dblC;

            //convert input from string to double
            dblF = Convert.ToDouble(strF);

            //calculate celsius using fahrenheit
            dblC = (dblF - 32) * 5 / 9;

            Console.WriteLine("\n\nToday's Temperature: {0:F2}{1} F = {2:F2}{1} C \n\n",
                dblF, chrDegree, dblC);

            double temp = double.Parse(Console.ReadLine());

            //if the user enters < 40
                if (temp < 40)
            {
                Console.WriteLine("\n\nIt is very cold. Put on a heavy coat.");
            }

            else if
            {
                 (temp > 40 || temp < 60)
                Console.WriteLine("\n\nIt is cold. Put on a coat.");
            }
            else if
            {
                 (temp >= 60 || temp < 70)
                Console.WriteLine("\n\nThe temperature is cool. Put on a light jacket.");
            }
            else if
            {
                 (temp >= 70 || temp < 80)
                Console.WriteLine("\n\nThe temperature is pleasant. Wear anything you like.");
            }
            else if
            {
                  (temp >= 80 || temp < 90)
                Console.WriteLine("\n\nThe temperature is warm. Wear short sleeves.");
            }
            else if
            {
                 (temp >= 90)
                Console.WriteLine("\n\nIt is hot. Wear shorts today.");
            }

            Console.WriteLine("Thank you for using the Temperature Conversion Application.\n\n");
            //ask if the user wants to continue
            Console.Write("Do you want to continue Y/N ? ");
            //reads in the user input
            strContinue = Console.ReadLine();
            Console.WriteLine("\n\n");

            //if the user enters N or n
            if (strContinue == "N" || strContinue == "n")
            {
            //set the bool variable to false
            boolContinue = false;
            }
            //otherwise
            else
            {
            //set the boolean variable to true
            boolContinue = true;
            }

            Console.ReadKey();

        }
    }
}

Answer 1

在这些点上会出现语法错误。

else if
{
    (temp > 40 || temp < 60)
    Console.WriteLine("\n\nIt is cold. Put on a coat.");
}

语法是if( expression) { /* ... */ }，所以(必须直接跟踪if。这是正确的：

else if (temp > 40 || temp < 60)
{
    Console.WriteLine("\n\nIt is cold. Put on a coat.");
}

另外，您忘记将此变量声明为string。

strContinue = Console.ReadLine();

并且正确地将此布尔值设置为true或false，因此只需将bool boolContinue = true;的声明移至Main()函数的开头，即将所有现有代码包装在while(boolContinue)表达式中即可。

Answer 2

有一个问题是你的比较。

else if
{
    (temp >= 90)
    Console.WriteLine("\n\nIt is hot. Wear shorts today.");
}

一定是..。

else if (temp >= 90)
{
    Console.WriteLine("\n\nIt is hot. Wear shorts today.");
}

Answer 3

多亏了马西米兰，我把事情解决了。

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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {

            //declare a char variable to store the degree symbol
            char chrDegree = (char)176;
            Boolean boolContinue = true;
            string strContinue;
            //declare two doubles to store F and C temperature
            double dblF, dblC;


            while (boolContinue == true)
            {

                //display program info
                Console.WriteLine("Temperature Conversions with Advice (v.1) Sept 17, 2015");
                Console.WriteLine("-------------------------------------------------------\n\n");
                //prompt user to enter the temperature in F
                Console.Write("Enter today's temperature in {0} F (eg 60): ", chrDegree);

                //read in the user input
                string strF = Console.ReadLine();


                //convert input from string to double
                dblF = Convert.ToDouble(strF);

                //calculate celsius using fahrenheit
                dblC = (dblF - 32) * 5 / 9;

                Console.WriteLine("\n\nToday's Temperature: {0:F2}{1} F = {2:F2}{1} C \n\n",
                    dblF, chrDegree, dblC);

                //if the user enters < 40
                if (dblF < 40)
                {
                    Console.WriteLine("\n\nIt is very cold. Put on a heavy coat.");
                }

                else if (dblF > 40 && dblF < 60)
                {
                    Console.WriteLine("\n\nIt is cold. Put on a coat.");
                }

                else if (dblF >= 60 && dblF < 70)
                {
                    Console.WriteLine("\n\nThe temperature is cool. Put on a light jacket.");
                }

                else if (dblF >= 70 && dblF < 80)
                {
                    Console.WriteLine("\n\nThe temperature is pleasant. Wear anything you like.");
                }

                else if (dblF >= 80 && dblF < 90)
                {
                    Console.WriteLine("\n\nThe temperature is warm. Wear short sleeves.");
                }

                else if (dblF >= 90)
                {
                    Console.WriteLine("\n\nIt is hot. Wear shorts today.");
                }

                Console.WriteLine("Thank you for using the Temperature Conversion Application.\n\n");
                //ask if the user wants to continue
                Console.Write("Do you want to continue Y/N ? ");
                //reads in the user input
                strContinue = Console.ReadLine();
                Console.WriteLine("\n\n");

                //if the user enters N or n
                if (strContinue == "N" || strContinue == "n")
                {
                    //set the bool variable to false
                    boolContinue = false;
                }
                //otherwise
                else
                {
                    //set the boolean variable to true
                    boolContinue = true;
                }

                Console.ReadKey();
            }

        }
    }
}

^这个工作，谢谢！