Convert double to string C++? [duplicate]

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You can’t do it directly. There are a number of ways to do it:

  1. Use a std::stringstream:

    std::ostringstream s;
s << "(" << c1 << ", " << c2 << ")";
storedCorrect[count] = s.str()

  2. Use boost::lexical_cast:

    storedCorrect[count] = "(" + boost::lexical_cast<std::string>(c1) + ", " + boost::lexical_cast<std::string>(c2) + ")";

  3. Use std::snprintf:

    char buffer[256];  // make sure this is big enough!!!
snprintf(buffer, sizeof(buffer), "(%g, %g)", c1, c2);
storedCorrect[count] = buffer;

There are a number of other ways, using various double-to-string conversion functions, but these are the main ways you’ll see it done.

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