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C# C# Basics (Retired) Perfect Variable Scope

Posted by GamingWithHan :)
.a{fill-rule:evenodd;}techdegree
GamingWithHan :)
Java Web Development Techdegree Student 1,966 Points

Variable Scope

Hey guys and girls, I am really stuck on this variable scope challenge cause I do not know what to do. Can someone help me?

Thanks

Program.cs 
using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {            
            input = Console.ReadLine();

            if (input == "quit")
            {
                string output = "Goodbye.";
            }
            else
            {
                string output = "You entered " + input + ".";
            }

            Console.WriteLine(output);
        }
    }
}
Jon Wood
Jon Wood
9,884 Points
Jon Wood
Jon Wood
9,884 Points

Antonio De Rose that's a great explanation! I like the idea of explaining with comments in the code.

2 Answers

Antonio De Rose
Antonio De Rose
20,885 Points
Antonio De Rose
Antonio De Rose
20,885 Points 
using System;

namespace Treehouse.CodeChallenges 
{ 
    class Program 
    { 
        static void Main() 
        {
            string input = Console.ReadLine();//this is correct, good work
            string output;//when you declare the variable here, accessibility of this variable is high, from here
            if (input == "quit")
            {
                output = "Goodbye.";//Now that the output is declared, you cant declare here again, so I take off the string part
            }
            else
            {
                output = "You entered " + input + ".";//here too, I take the string part, otherwise, am double doing
            }

            Console.WriteLine(output);
            //till here, the output variable could be accessed
        }
    }
}
Antonio De Rose
Antonio De Rose
20,885 Points
Antonio De Rose
Antonio De Rose
20,885 Points 
using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {            
            input = Console.ReadLine(); //variable being used without declaring, so you will need the variable type in front

            if (input == "quit")
            {
                string output = "Goodbye.";//this is about variable scoping, string is only within this blocks
            }
            else
            {
                string output = "You entered " + input + ".";//again variable scoping, string is only available within the blocks
            }

            Console.WriteLine(output);// given, it was declared, in those blocks, it cannot be used here, the output
//better idea would be declare the output variable just below, where input is to be declared
//then you need not have declare the variable output, at, if and else
        }
    }
}

Moderator Edit: Moved response from Comments section to Answers.

GamingWithHan :)
.a{fill-rule:evenodd;}techdegree
GamingWithHan :)
Java Web Development Techdegree Student 1,966 Points

Thanks so much Antonio!

GamingWithHan :)
.a{fill-rule:evenodd;}techdegree
GamingWithHan :)
Java Web Development Techdegree Student 1,966 Points

Hey Antonio, Thanks for the answer! However, I am still rn having trouble with the code. Here is what i have currently:

using System;

namespace Treehouse.CodeChallenges { class Program { static void Main() {
string input = Console.ReadLine();

        if (input == "quit")
        {
            string output = "Goodbye.";
        }
        else
        {
            string output = "You entered " + input + ".";
        }

        Console.WriteLine(output);
    }
}

}