C# variables and data types exercises

Exercise 1: Write C# code to declare a variable to store the age of a person. Then the output of the program is as an example shown below:

You are 20 years old.

Solution:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Csharp_exercises

{

class Program

{

static void Main(string[] args)

{

int age = 20;// declaring variable and assign 20 to it.

Console.WriteLine("You are {0} years old.",age);

Console.ReadLine();

}

}

}

Exercise 2: Write C# code to display the asterisk pattern as shown below:

*****

*****

*****

*****

*****

Solution:

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

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

   Console.WriteLine("*****");
   Console.WriteLine("*****");
   Console.WriteLine("*****");
   Console.WriteLine("*****");
   Console.WriteLine("*****");
   Console.ReadLine();
        }
    }
}

Exercise 3: Write C# code to declare two integer variables, one float variable, and one string variable and assign 10, 12.5, and "C# programming" to them respectively. Then display their values on the screen.

Solution:

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

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

int x;
float y;
string s;
x = 10;
y = 12.5f;
s = "C# programming";
Console.WriteLine(x);
Console.WriteLine(y);
Console.WriteLine(s);
Console.ReadLine();
}
}
}

Exercise 4: Write C# code to prompt a user to input his/her name and then the output will be shown as an example below:

Hello John!

Solution:

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

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

  string name;
  Console.Write("Please enter your name:");
  name = Console.ReadLine();
  Console.WriteLine("Hello {0}!", name);
  Console.ReadLine();
         }
   }
}