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String Replace

Squeaks (12)
How do I get my program to replace the parts of my string with whatever the user enters? For example, here I'm trying to put an x into the string pos for whatever position the user enters. The string stays in tact for the first 2 entries, but after that a number disappears. What gives? 
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  #include <iostream>
#include <string>
#include <algorithm>


using namespace std;

int main()
{
    string pos = "012345678";
    int move;
    string letter = "x";
    for(int i = 1;i<9;i++)
    {
    cout << pos << endl;
    cout << "Your move is: ";
    cin >> move;
    if(move == 0)
    {
        pos.replace(0,1,letter);
    }
    if(move == 1)
    {
        pos.replace(1,1,letter);
    }
    if(move == 2)
    {
        pos.replace(2,2,letter);

    }
    if(move == 3)
    {
        pos.replace(3,3,letter);
    }
    if(move == 4)
    {
        pos.replace(4,4,letter);
    }
    if(move == 5)
    {
        pos.replace(5,5,letter);
    }
    if(move == 6)
    {
        pos.replace(6,6,letter);
    }
    if(move == 7)
    {
        pos.replace(7,7,letter);

    }
    if(move == 8)
    {
        pos.replace(8,8,letter);
    }
    cout << pos << endl;
    }

    return 0;
}
Squeaks (12)
bump
manutd636 (11)
You just want it to replace the one number, right?

If so, the second parameter in replace should simply be 1, not the same number as move.
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