Development C++ Tutorial

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#include 
#include 
#include 
using namespace std;
int main( ) {
   ios_base::fmtflags flags = cout.flags( );
   double pi = 3.14285714;
   cout << "pi = " << fixed            
        << showpos                     
        << setprecision(3)
        << pi << '\n';    
   cout.flags(flags);
}
pi = +3.143