Thread: errors may b concerning strings

Code:

#include <iostream>
#include <string>
using namespace std;

int main()
{
	string letters = "Madam I'm Adam";
	size_t length = letters.length();
	bool isPalindrome;
	unsigned index = 0;
	string testStr;
	
	// Lowercase all the characters
	// extract the letters without including punctuation and spaces
	while (index < length)
	{
		if (isalpha(letters[index]))		
			testStr += tolower(letters[index]);

		index++;
	}

	// Now check if it is a palindrome
	isPalindrome = true;
	for (int i = 0; i < (testStr.length() / 2); i++)
	{
		if (testStr[i] != testStr[testStr.length() - (i-1)])
		{
			isPalindrome = false;
			break;
		}
	}
	cout << "\"" << letters << "\"" << isPalindrome ? "is" : "is not"
		 << " a palindrome." << endl;

	return EXIT_SUCCESS;

}

I can get it to compile due to some errors which I'm unable to understand, I'm compiling it with Visual Studio 2005

The build log is

EDIT:

Got it. Was using C++/CLI so, had forgotten the parenthesis

but still there are two errors

Code:

1>------ Build started: Project: C++ConsoleTest, Configuration: Debug Win32 ------
1>Compiling...
1>test.cpp
1>c:\documents and settings\manzoor\my documents\visual studio 2005\projects\c++consoletest\c++consoletest\test.cpp(25) : warning C4018: '<' : signed/unsigned mismatch
1>c:\documents and settings\manzoor\my documents\visual studio 2005\projects\c++consoletest\c++consoletest\test.cpp(34) : error C2296: '<<' : illegal, left operand has type 'const char [7]'
1>c:\documents and settings\manzoor\my documents\visual studio 2005\projects\c++consoletest\c++consoletest\test.cpp(34) : error C2297: '<<' : illegal, right operand has type 'const char [15]'
1>Build log was saved at "file://c:\Documents and Settings\manzoor\My Documents\Visual Studio 2005\Projects\C++ConsoleTest\C++ConsoleTest\Debug\BuildLog.htm"
1>C++ConsoleTest - 2 error(s), 1 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Well, it would be great if told how to resolve the warning