拼接字符串和整型值

    int i = 123;
    char buffer[20];
    std::string number("number = ");
    std::string str = number + itoa(i, buffer, 10);

    int i = 123;
    std::string number("number = ");
    std::stringstream ss;
    ss << number << i;
    std::string str = ss.str();