find a char in a string

Hello,

I am trying to find and replace a character in a string.

Code:

---

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

int main()
{
        string s("This is a piece of text.  All of the \"a's\" will be replaced by \"XXX's\".");
        const char target = 'a';
        string replace_with("XXX");
       
        size_t pos = 0;
        while(pos != string::npos)
        {
                pos = s.find(target, pos, 1);
                if(pos != string::npos)
                {
                        s.replace(pos, 1, replace_with);
                        pos++;
                }
        }
       
        cout << s << endl;
       
        return 0;
}

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I am getting an error on the line that defines target.

Quote:

---

error: invalid conversion from ‘char’ to ‘const char*’

---

If I put "a", in find(), in place of target it works.

The version of find that takes a single char as the first argument does not contain a third argument. (In fact, most of the versions of find don't take a third argument.)