DouKaku?

#include <iostream>
#include <sstream>
#include <cctype>
#include <string>
#include <algorithm>
#include <functional>

std::string convert_do(const std::string& s)
{
    std::istringstream sin(s);

    int price;

    sin >> price;

    price *= 1.05;

    std::ostringstream sout;

    sout << price;

    return sout.str();
}

struct isdigit : std::unary_function<char, bool>
{
    bool operator()(char c) const
    {
        return std::isdigit(c);
    }
};

std::string convert(const std::string& s)
{
    std::string ret;

    std::string::const_iterator beg = s.begin();
    std::string::const_iterator end = s.end();

    while (true)
    {
        std::string::const_iterator cur;

        cur = std::find_if(beg, end, isdigit());

        ret.append(std::string(beg, cur)); beg = cur;

        if (beg == end)
        {
            break;
        }

        cur = std::find_if(beg, end, std::not1(isdigit()));

        ret.append(convert_do(std::string(beg, cur))); beg = cur;
    }

    return ret;
}

int main()
{
    std::cout << convert("ƒ_ƒCƒRƒ“150‰~AƒnƒNƒTƒC120‰~AƒWƒƒƒKƒCƒ‚30‰~") << std::endl;
}