It depends on what country. There are lists of STD Codes (telephone area codes) for different countries on a variety of websites. See the related links below for a few examples.
India has hundreds of STD Codes (telephone area codes). Please be more specific.
There are many postal codes and STD Codes (telephone area codes) in the state of Tamil Nadu. Please be more specific.
STD, or Subscriber Trunk Dialling, began in the UK in 1958.
FED-STD-595 http://www.fed-std-595.com/
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There are some medical clinics that may offer free STD testing. I would check with local shelters to see where the clinics are and see if they will test for free or a low fee.
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You can find the ASCII value of numbers greater than 9 using the following functions: std::to_string or boost::lexical_cast or std::ostringstream depending on the compiler that you are using.
Your question is not clear. "STD codes" (Subscriber Trunk Dialling) is another term for telephone area codes in some countries, including the UK, Ireland, India, Pakistan, South Africa, and other formerly British countries around the world. There are tables of area codes for each country. See the related links below for examples.
In general, you need to specify the country, since several countries refer to telephone area codes as "STD codes." See the Related Questions below. In the UK, 01388 is a County Durham area code, including Bishop Auckland and Stanhope.
Use an associative container such as std::set and enumerate in reverse order, or supply a predicate that sorts in descending order such as std::greater<T> (default is std::less<T>).
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