How to Append an Integer Value to a String in C ?

Appending Integer Values to a String in C

Originally, this question sought to address the issue of appending an integer to a string, but encountered a runtime error. The C programming language offers several methods for resolving this issue.

std::string::append()

The std::string::append() method expects arguments to be null-terminated strings (char*). However, directly appending an integer (int) will not produce the desired result.

Recommended Approaches

To append an integer value to a string, consider the following techniques:

• std::ostringstream:

  #include <sstream>
  
  std::ostringstream s;
  s << "select logged from login where id = " << ClientID;
  std::string query(s.str());

• std::to_string (C 11):

  std::string query("select logged from login where id = " +
                  std::to_string(ClientID));

• boost::lexical_cast:

  #include <boost/lexical_cast.hpp>
  
  std::string query("select logged from login where id = " +
                  boost::lexical_cast<std::string>(ClientID));

These methods effectively convert the integer value into a string representation and append it to the string.

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