Erasing a string array

[jibicax]

I'm reversing C-string inputs, which I got working fine. My problem is when I try to apply the code to a while loop to enter new inputs. The new inputs keep adding to the old ones.

How do I get the string array to clear all values?

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

string inputString, outputString, again;
    int main(){    
        cout << "Enter a phrase you want reversed: ";
	cin >> inputString;
	cout << endl;
        
        int nLength = inputString.length();
	nLength--;
       
        while (1){	
	for(int nIndex = nLength; nIndex >= 0; nIndex--);
		{
	       outputString+=inputString[nIndex];
		}
	cout << "The reversed phrase is: " << outputString << endl;
	cout << "Again? (y/n)";
	cin >> again;
		
	 	if(again == "y" ){
		cout << "Enter a phrase you want reversed: ";
		cin >> inputString;
		}
		
		if (again !="y"){
		cout << "Please close the window." << endl;
		break;
		}
	}
return 0;
}

I've attempted

if(again == "y" ){
memset(outputString, 0, nIndex)
cout << "Enter a phrase you want reversed: ";
cin >> inputString;}

But that has the error:
[Error] name lookup of 'nIndex' changed for ISO 'for' scoping [-fpermissive]

[cire]

if(again == "y" ){
    outputString.clear();
    cout << "Enter a phrase you want reversed: ";
    cin >> inputString;
}

[jibicax]

Thanks but the error at line 17 is still there.
[Error] name lookup of 'nIndex' changed for ISO 'for' scoping [-fpermissive]

[cire]

You have a semi-colon that shouldn't be there at the end of line 17 15.

[TarikNeaj]

You have a semicolon at line 15, remove it.

for(int nIndex = nLength; nIndex >= 0; nIndex--); // this one.

[jibicax]

Thanks!!