C# method returning a bool

Question

Hi!

I am checking whether an input is a palindrome or not with the help of a method. However, I get error in the part of code bolded and underlined below:

public static bool Check (string input)

{

bool palindrome = false;

string checker = "";

for (int i = input.Length; i >= 0; i--)

{

checker = checker + input[i];

}

if (checker == input)

{

palindrome = true;

}

return palindrome;

}

static void Main(string[] args)

{

Console.Write("Write a word: ");

string input = Console.ReadLine();

Check(input);

if (palindrome = true)

{

}

}

}

Why does it not know what variable palindrome is? Havent I returned it in my Check method?? Pls help!!

Answer 1

/*******************************************************

//********************* 10/30/2020*****************

Returns true if string is a palindrome

*********************************************************/

using System.IO;

using System;

class Program

{

public bool IsPalindrome(string inbuff)

{

int iLeft=0;

int iRight=inbuff.Length-1;

bool boolReturn = true;

while (iLeft<iRight)

{

String leftChar = inbuff.Substring(iLeft,1);

String rightChar = inbuff.Substring(iRight,1);

//Console.WriteLine(leftChar);

//Console.WriteLine(rightChar);

if (string.Compare(rightChar.ToUpper(), leftChar.ToUpper())==0)

{

}

else

{

boolReturn=false;

break;

}

iLeft++; iRight--;

}

return(boolReturn);

}

void Go()

{

string inputStr = "ABBA";

//string inputStr = "ABACADABRA";

//string inputStr = "ABCDEFGFEDCBA"; //<-- change the chars

// string inputStr = "ABCDEFGGFEDCBA"; //<--- to test

Console.Write(inputStr);

if (IsPalindrome(inputStr))

{

Console.WriteLine(" is a palindrome");

}

else

{

Console.WriteLine(" is not a palindrome");

}

}

static void Main()

{

Console.WriteLine("Hello, World!");

Program x = new Program();

x.Go();

}

}

/******************************************************************************

Capitalizes every other word in the string

*********************************/

using System.IO;

using System;

class Program

{

static void Main()

{

Console.WriteLine("Hello, World!");

string inputStr = "the quick brown fox jumped over the lazy dogs";

string [] tokens = inputStr.Split(' ');

int i=0;

foreach (string token in tokens)

{

if (token.Trim() != "")

{

if ((i%2)==1) //every other token gets capitalized

{

Console.Write(token);

}

else

{

//separates the first character from the rest of the token string

string firstChar = token.Substring(0,1);

int N = token.Length;

string restOfTheToken = token.Substring(1,N-1);

//captialization occurs here

string outBuff =string.Concat(firstChar.ToUpper(),restOfTheToken);

Console.Write(outBuff);

}

Console.Write(" ");

i++;

} //non-empty tokesn

} //foereach

}

}

******************* 10/29/2020

Palindrome

Is not the name of the method...

The method is Check()

palindrome is a local var inside check() which main() cannot see until it gets returned...

But in your code you are not checking the return value

In main either do:

If (Check(input))

Or

bool bReturn = Check(input):

If (bReturn)

...