Converting a vector int to string

Question

In C    what is the simplest way to convert a vector of ints  i e  vector lt int gt   to a string

User · Answer

template lt typename T gt  string str T begin  T end        stringstream ss      bool first   true      for    begin    end  begin                  if   first              ss  lt  lt                ss  lt  lt   begin          first   false            return ss str        This is the str function that can make integers turn into a string and not into a char for what the integer represents  Also works for doubles

User · Answer

Here is an alternative which uses a custom output iterator  This example behaves correctly for the case of an empty list  This example demonstrates how to create a custom output iterator  similar to std  ostream iterator    include  lt iterator gt   include  lt vector gt   include  lt iostream gt   include  lt sstream gt   struct CommaIterator     public std  iterator lt std  output iterator tag  void  void  void  void gt      std  ostream  os    std  string comma    bool first     CommaIterator std  ostream amp  os  const std  string amp  comma          os  amp os   comma comma   first true             CommaIterator amp  operator       return  this      CommaIterator amp  operator   int    return  this      CommaIterator amp  operator      return  this      template  lt class T gt    CommaIterator amp  operator  const T amp  t        if first        first   false      else        os  lt  lt  comma       os  lt  lt  t      return  this          int main           The vector to convert   std  vector lt int gt  v 3 3         Convert vector to string   std  ostringstream oss    std  copy v begin    v end    CommaIterator oss           std  string result   oss str      const char  c result   result c str          Display the result    std  cout  lt  lt  c result  lt  lt    n

User · Answer

Maybe std  ostream iterator and std  ostringstream    include  lt vector gt   include  lt string gt   include  lt algorithm gt   include  lt sstream gt   include  lt iterator gt   include  lt iostream gt   int main       std  vector lt int gt  vec    vec push back 1     vec push back 4     vec push back 7     vec push back 4     vec push back 9     vec push back 7      std  ostringstream oss     if   vec empty               Convert all but the last element to avoid a trailing         std  copy vec begin    vec end  -1          std  ostream iterator lt int gt  oss                 Now add the last element with no delimiter     oss  lt  lt  vec back           std  cout  lt  lt  oss str    lt  lt  std  endl

User · Answer

I usually do it this way       include  lt string gt   include  lt vector gt   int main  int argc  char  argv           std  vector lt char gt  vec            do something with vec     std  string str vec begin    vec end               do something with str     return 0

[c++] Converting a vector<int> to string

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