Redo char is undeclared yet it is declared - c++

Question

I'm getting a error with redo char (in bold) on main.cpp when I obviously declare it above. I also would like to know why its asking me to put a semicolon in front of using namespace std since I've never done that before.
//ReverseString.h
#include <iostream>
#include <string>
using namespace std;
class StringClass
{
public:
string string;
int GetStringLength (char*);
void Reverse(char*);
void OutputString(char*);
void UserInputString (char*);
StringClass();
private:
int Length;
}
//StringClass.cpp
#include <iostream>
#include <string>
#include "ReverseString.h"
;using namespace std;
void StringClass::UserInputString(char *string)
{
cout << "Input a string you would like to be reversed.\n";
cin >> string;
cout << "The string you entered: " << string << endl;
}
int StringClass::GetStringLength (char *string)
{
Length = strlen(string);
return Length;
}
void StringClass::Reverse(char *string)
{
int c;
char *front, *rear, temp;
front = string;
rear = string;
GetStringLength(string);
for ( c = 0 ; c < ( Length - 1 ) ; c++ )
rear++;
for ( c = 0 ; c < Length/2 ; c++ )
{
temp = *rear;
*rear = *front;
*front = temp;
front++;
rear--;
}
}
void StringClass::OutputString(char *string)
{
cout << "Your string reversed is: " << string << ".";
}
//Main.cpp
#include <iostream>
#include <string>
#include <fstream>
#include "ReverseString.h"
;using namespace std;
const int MaxSize = 100;
int main()
{
do
{
char string[MaxSize];
**char redo;**
StringClass str;
str.UserInputString(string);
str.Reverse(string);
str.OutputString(string);
//Asks user if they want redo the program
cout << "Would you like to redo the program?\n";
cout << "Please enter Y or N: \n";
**cin >> redo;**
}while(redo == 'Y' || redo == 'y');
}
It's really confusing of why its declaring it but giving an error that it isn't declared.

Answer 1

redo is declared as a local variable within the loop. Its scope starts at the point of declaration, and ends at the closing brace right before while keyword. The name redo is not known within the while condition.

Answer 2

You are missing a semi-colon after your class declaration in ReverseString.h.
The compiler is picking up the error on the line using namespace std; because that is when a problem is first detected. That doesn't mean that you should put the semi-colon there.
Some compilers will hint that you might be missing a semi-colon from a class declaration, while others will not. This mistake is quite common. If you see the missing semi-colon error in a ridiculous place, you should immediately consider that you might have accidentally left one out of your headers.