Use a string stream to create formatted string - C++ File Stream

C++ examples for File Stream:stream

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Description

Use a string stream to create formatted string

Demo Code

#include <iostream>
#include <sstream>
using namespace std;
int main()//from  w  w  w.  j  a v  a2s .  co m
{
   char ch;
   ostringstream strout;
   cout << "Use an output string stream called strout.\n";
   // Write output to the string stream..
   strout << 10 << " " << -20 << " " << 30.2 << "\n";
   strout << "This is a test.";

   cout << "The current contents of strout as obtained from str():\n"  << strout.str() << endl;
   strout << "\nThis is some more output.\n";
   cout << endl;
   cout << "Use an input string stream called strin.\n";

   // Now, use the contents of strout to create strin:
   istringstream strin(strout.str());
   // Display the contents of strin via calls to get().

   cout << "Here are the current contents of strin via get():\n";
   do {
      ch = strin.get();
      if(!strin.eof()) cout << ch;
   } while(!strin.eof());
   cout << endl;

   cout << "Now, use an input/output string stream called strinout.\n";
   stringstream strinout;
   strinout << 10 << " + " << 12 << " is " << 10+12 << endl;
   cout << "Here are the current contents of strinout via get():\n";

   do {
      ch = strinout.get();
      if(!strinout.eof()) cout << ch;
   } while(!strinout.eof());
   cout << endl;

   // Clear eofbit on strinout.
   strinout.clear();
   strinout << "More output to strinout.\n";
   // The following will continue reading from the point
   // at which the previous reads stopped.
   cout << "Here are the characters just added to strinout:\n";
   do {
      ch = strinout.get();
      if(!strinout.eof()) cout << ch;
   } while(!strinout.eof());
}

Result


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