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Introduction to .NET with C#

Task - Building a Simple CalculatorTask - Building a Simple Calculator

How to solve tasks:

Task:

Create a basic calculator program. It should work like this:

  1. Ask the user for a math operation and store it in a char variable called opr;
  2. Ask the user for the first number, and store it in a float variable called first;
  3. Ask the user for the second number, and store it in a float variable called second;
  4. Apply the operator on the two numbers and display the result.

The entered operation will be of type string, and the user will enter one of the four options: +, -, /, *.

You don't need to deal with cases where the user enters an invalid operation or an invalid number.

The resulting output must be in the following format otherwise, the test cases might fail:

Here first, second and result are float values.

Link to the Task: GitHub
Use conditional if-else statements or the switch statement to check which operation the user has entered, and apply the operation on the two numbers based on that. 

public class Program
{
    public static void Main(string[] args)
    {
        Console.Write("Enter an operation (+, -, /, *): ");
        char opr = Console.ReadLine()[0];

        Console.Write("Enter the first number: ");
        float first = float.Parse(Console.ReadLine());

        Console.Write("Enter the second number: ");
        float second = float.Parse(Console.ReadLine());

        float result = 0;
        if (opr == '+')
            result = first + second;
        else if (opr == '-')
            result = first - second;
        else if (opr == '/')
            result = first / second;
        else if (opr == '*')
            result = first * second;

        Console.WriteLine($"The result of '{first} {opr} {second}' is: {result}");
    }
}

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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#

Task - Building a Simple CalculatorTask - Building a Simple Calculator

How to solve tasks:

Task:

Create a basic calculator program. It should work like this:

  1. Ask the user for a math operation and store it in a char variable called opr;
  2. Ask the user for the first number, and store it in a float variable called first;
  3. Ask the user for the second number, and store it in a float variable called second;
  4. Apply the operator on the two numbers and display the result.

The entered operation will be of type string, and the user will enter one of the four options: +, -, /, *.

You don't need to deal with cases where the user enters an invalid operation or an invalid number.

The resulting output must be in the following format otherwise, the test cases might fail:

Here first, second and result are float values.

Link to the Task: GitHub
Use conditional if-else statements or the switch statement to check which operation the user has entered, and apply the operation on the two numbers based on that. 

public class Program
{
    public static void Main(string[] args)
    {
        Console.Write("Enter an operation (+, -, /, *): ");
        char opr = Console.ReadLine()[0];

        Console.Write("Enter the first number: ");
        float first = float.Parse(Console.ReadLine());

        Console.Write("Enter the second number: ");
        float second = float.Parse(Console.ReadLine());

        float result = 0;
        if (opr == '+')
            result = first + second;
        else if (opr == '-')
            result = first - second;
        else if (opr == '/')
            result = first / second;
        else if (opr == '*')
            result = first * second;

        Console.WriteLine($"The result of '{first} {opr} {second}' is: {result}");
    }
}

Все було зрозуміло?

Секція 1. Розділ 4
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