[newbie]Find number of times a string appears in another string.

So I have a parent string hardcoded in to the code.And I have to find number of times a string appears in the original string.I know that I can find the first occurrence of the string using str.find() but how do I start searching the parent string from that position again and update the counter.

string::find - C++ Reference
Including an example.

Here is what I came up with

Code:

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do {
        pos=str.find("fork",pos);
        count++;
        cout<<"test";
    }while (pos!=string::npos);

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But the loop does not terminate ever.It just prints test repeatedly.What am I doing wrong?

Did you read the link I posted?
Did you notice a +1 to indicate starting a search at the next character?