Convert double to string C

Question

Possible Duplicate    How do I convert a double into a string in C          I want to combine a string and a double and g   is throwing this error   main cpp  In function    int main       main cpp 40  error  invalid operands of types    const char  2     and    double    to binary    operator      Here is the line of code which it is throwing the error on    storedCorrect count        c1     c2        storedCorrect   is a string array  and c1 and c2 are both doubles  Is there a way to convert c1 and c2 to strings to allow my program to compile correctly

User · Answer

In C  11  use std  to string if you can accept the default format   f    storedCorrect count         std  to string c1           std  to string c2

User · Answer

std  string stringify double x        std  ostringstream o     if    o  lt  lt  x        throw BadConversion  stringify double        return o str         C   FAQ  http   www parashift com c  -faq-lite misc-technical-issues html faq-39 1

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Use std  stringstream   Its operator  lt  lt  is overloaded for all built-in types    include  lt sstream gt       std  stringstream s  s  lt  lt       lt  lt  c1  lt  lt       lt  lt  c2  lt  lt       storedCorrect count    s str      This works like you d expect - the same way you print to the screen with std  cout   You re simply  printing  to a string instead   The internals of operator  lt  lt  take care of making sure there s enough space and doing any necessary conversions  e g   double to string    Also  if you have the Boost library available  you might consider looking into lexical cast   The syntax looks much like the normal C  -style casts    include  lt string gt   include  lt boost lexical cast hpp gt  using namespace boost   storedCorrect count          lexical cast lt std  string gt  c1                                 lexical cast lt std  string gt  c2           Under the hood  boost  lexical cast is basically doing the same thing we did with std  stringstream   A key advantage to using the Boost library is you can go the other way  e g   string to double  just as easily   No more messing with atof   or strtod   and raw C-style strings

User · Answer

You can t do it directly   There are a number of ways to do it    Use a std  stringstream   std  ostringstream s  s  lt  lt       lt  lt  c1  lt  lt        lt  lt  c2  lt  lt       storedCorrect count    s str    Use boost  lexical cast   storedCorrect count          boost  lexical cast lt std  string gt  c1           boost  lexical cast lt std  string gt  c2          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

User · Answer

I believe the sprintf is the right function for you  I s in the standard library  like printf  Follow the link below for more information   http   www cplusplus com reference clibrary cstdio sprintf

[c++] Convert double to string C++?

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