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do while loop

Alejandra (1)
I need to create a program that generate random letters using a previos one, until it is the same as user type.
When I include the do while loop to make the last loop of the program it shows me an error C2061. Can you help me? This is what I have

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>
#include <cstring>

using namespace std;

void terminateProgram()
{
cout << "Press any character and <Enter> to continue"<< endl;
char chAnyChar;
cin >> chAnyChar;
return;
}


int main()
{
// Create a string with the objetive sentence
char obj[31];
cout << "Type a Short sentences: (no more than 30 characteres)\n" << "******************************" << endl;
cin.get(obj, 31);
// Show the objetive sentences
cout << "\nYour objetive sentence is:\n" << obj << endl;
cout << endl;


//Generate a random sentence using letters and space

//Letters and space that will be used
static char cLetters [30] = {' ', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '\0'};
int iRandNumber;

// Use the computer time as a seed for the numbers
srand((unsigned)time(NULL));


cout << "Your initial random sentence is:\n" ;
static char NewS [31];

//Use the letters of the array insted of the random number
for (int i = 0; i <30; i++)
{
iRandNumber = rand() % 27;
NewS[i] = cLetters[iRandNumber];
cout << NewS[i];
}
cout << "\n" << endl;


do
{

static char New2S [31];

cout << "Your mutation sentence is: \n" ;
for (int i=0; i < 30 ; i++)
{
New2S [i] = NewS [i];
}

int randpos = rand() % 30;
New2S[randpos] = cLetters[iRandNumber];

for (int i=0; i < 30 ; i++)
{
cout << New2S[i];
}
cout << endl;


int iDifOS = 0;
for (int i=0; i < 30 ; i++)
{
if (obj[i]!= NewS[i])
iDifOS += 1;
}

int iSimOS = 30 - iDifOS;
cout << endl;
cout << "the similarity between the objetive sentence and the first random is:" <<iSimOS << endl;

int iDifO2S = 0;
for (int i=0; i < 30 ; i++)
{
if (obj[i]!= New2S[i])
iDifO2S += 1;
}
int iSimO2S = 30 - iDifO2S;

cout << endl;
cout << "the similarity between the objetive sentences and the mutation sentence is:" <<iSimO2S << endl;

for (int i=0; i < 30 ; i++)
{
if (iSimO2S > iSimOS)
{
NewS[i] = New2S[i];
}
}
cout << endl;
cout << "The mutation sentence that will stay as Random Parental is:";
cout << endl;
for (int i=0; i < 30 ; i++)
{
cout << NewS[i];

}
cout << endl;

while (iSimOS < 30);
}

terminateProgram();
return 0;
}
Chervil (7320)
Please use code tags <> on the right.
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#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>
#include <cstring>

using namespace std;

void terminateProgram()
{
    cout << "Press any character and <Enter> to continue"<< endl;
    char chAnyChar;
    cin >> chAnyChar;
    return;
}


int main()
{
    // Create a string with the objetive sentence
    char obj[31];
    cout << "Type a Short sentences: (no more than 30 characteres)\n" << "******************************" << endl;
    cin.get(obj, 31);
    // Show the objetive sentences
    cout << "\nYour objetive sentence is:\n" << obj << endl;
    cout << endl;


    //Generate a random sentence using letters and space

    //Letters and space that will be used
    static char cLetters [30] = {' ', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '\0'};
    int iRandNumber;

    // Use the computer time as a seed for the numbers
    srand((unsigned)time(NULL));


    cout << "Your initial random sentence is:\n" ;
    static char NewS [31];

    //Use the letters of the array insted of the random number
    for (int i = 0; i <30; i++)
    {
        iRandNumber = rand() % 27;
        NewS[i] = cLetters[iRandNumber];
        cout << NewS[i];
    }
    cout << "\n" << endl;


    do
    {

        static char New2S [31];

        cout << "Your mutation sentence is: \n" ;
        for (int i=0; i < 30 ; i++)
        {
            New2S [i] = NewS [i];
        }

        int randpos = rand() % 30;
        New2S[randpos] = cLetters[iRandNumber];

        for (int i=0; i < 30 ; i++)
        {
            cout << New2S[i];
        }
        cout << endl;


        int iDifOS = 0;
        for (int i=0; i < 30 ; i++)
        {
            if (obj[i]!= NewS[i])
            iDifOS += 1;
        }

        int iSimOS = 30 - iDifOS;
        cout << endl;
        cout << "the similarity between the objetive sentence and the first random is:" <<iSimOS << endl;

        int iDifO2S = 0;
        for (int i=0; i < 30 ; i++)
        {
            if (obj[i]!= New2S[i])
            iDifO2S += 1;
        }
        int iSimO2S = 30 - iDifO2S;

        cout << endl;
        cout << "the similarity between the objetive sentences and the mutation sentence is:" <<iSimO2S << endl;

        for (int i=0; i < 30 ; i++)
        {
            if (iSimO2S > iSimOS)
            {
                NewS[i] = New2S[i];
            }
        }
        cout << endl;
        cout << "The mutation sentence that will stay as Random Parental is:";
        cout << endl;
        for (int i=0; i < 30 ; i++)
        {
            cout << NewS[i];
        }
        cout << endl;

        while (iSimOS < 30);
    }

    terminateProgram();
    return 0;
}


There's a do loop stating on line 52. The closing brace is on line 112.
But this loop has no while() condition.
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