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Introduction to .NET with C#

Taking input from the UserTaking input from the User

Recap:

  • Console.ReadLine() statement can be used for taking input from the user, in the form of a string;
  • Every built-in data type has a Parse method. It can be used for extracting data of that type from a string;
  • Giving a value of a very big magnitude (can be positive or negative) for int.Parse will crash the program. This happens because int has a limited capacity, and if the number is bigger than that capacity, the program doesn't know what to do, so it crashes. In cases where values of big magnitude are expected, using long.Parse is preferable;
  • Using float.Parse when dealing with very precise values can potentially cause loss of data because float has a limited precision, and parsing a very precise value will cause the program to round off the input - therefore causing some loss of precision/data. It is preferable to use double.Parse in such cases;
  • A character can be parsed from a string using the char.Parse() method. It can also be parsed via indexing as well. So using Console.ReadLine()[0] is a shorter way of writing char.Parse(Console.ReadLine()).
1. Which method is used for taking input from the user?
2. What is the type of returned data from the <code>Console.ReadLine()</code> method?
3. What will be the output of the following statement?
4. Assuming that the user enters an empty string as an input, what will be the output of the following statement?

Which method is used for taking input from the user?

Виберіть правильну відповідь

What is the type of returned data from the Console.ReadLine() method?

Виберіть правильну відповідь

What will be the output of the following statement?

Виберіть правильну відповідь

Assuming that the user enters an empty string as an input, what will be the output of the following statement?

Виберіть правильну відповідь

Все було зрозуміло?

Секція 1. Розділ 3
course content

Зміст курсу

Introduction to .NET with C#

1. Introduction

What is the .NET Platform exactly?Creating a Console ApplicationTaking input from the UserTask - Building a Simple CalculatorDealing with Exceptions caused by User InputTask - Improving the CalculatorReading FilesWriting FilesTask - File Based Calculator

2. Asynchronous Programming and Introduction to Web Services

What is Asynchronous Programming?Implementing an Asynchronous MethodTask - Asynchronously Reading FilesIntroduction to APIsMaking a GET RequestTask - Using an APIHandling Exceptions caused by HTTP RequestTask - Exception Handling for API Response

3. Introduction to Databases with .NET

What is a Database?Structure of a Relational DatabaseSetting Up A MySQL ServerConnecting to the MySQL ServerTask - Writing Connection StringsExecuting CommandsTask - Executing MySQL CommandsMySqlCommand MethodsTask - Connecting to a MySQL Database and Executing Commands

4. CRUD Operations with MySQL

Introduction to CRUD OperationsInstalling & Using MySQL WorkbenchCREATE - Part ITask - Using CREATECREATE - Part IITask - Using INSERTReadTask - Using SELECTUpdateTask - Using UPDATEDelete - Part IDelete - Part IITask - Using DELETE

5. Optimizing Database Operations

Stored ProceduresTask - Executing Stored ProceduresDataReader vs DataSetDataAdapter & DataSetTask - Reading Tables using MySqlDataAdapterWhat's Next?

Introduction to .NET with C#

Taking input from the UserTaking input from the User

Recap:

  • Console.ReadLine() statement can be used for taking input from the user, in the form of a string;
  • Every built-in data type has a Parse method. It can be used for extracting data of that type from a string;
  • Giving a value of a very big magnitude (can be positive or negative) for int.Parse will crash the program. This happens because int has a limited capacity, and if the number is bigger than that capacity, the program doesn't know what to do, so it crashes. In cases where values of big magnitude are expected, using long.Parse is preferable;
  • Using float.Parse when dealing with very precise values can potentially cause loss of data because float has a limited precision, and parsing a very precise value will cause the program to round off the input - therefore causing some loss of precision/data. It is preferable to use double.Parse in such cases;
  • A character can be parsed from a string using the char.Parse() method. It can also be parsed via indexing as well. So using Console.ReadLine()[0] is a shorter way of writing char.Parse(Console.ReadLine()).
1. Which method is used for taking input from the user?
2. What is the type of returned data from the <code>Console.ReadLine()</code> method?
3. What will be the output of the following statement?
4. Assuming that the user enters an empty string as an input, what will be the output of the following statement?

Which method is used for taking input from the user?

Виберіть правильну відповідь

What is the type of returned data from the Console.ReadLine() method?

Виберіть правильну відповідь

What will be the output of the following statement?

Виберіть правильну відповідь

Assuming that the user enters an empty string as an input, what will be the output of the following statement?

Виберіть правильну відповідь

Все було зрозуміло?

Секція 1. Розділ 3
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