list7-4.txt

这是c++编程方面的名著的例子代码

    1   #include <unistd.h>
    2   #include <stdlib.h>
    3   #include <stdio.h>
    4   #include <fstream.h>
    5   #include <rational.h>
    6   #include <iterator.h>
    7   #include <set.h>
    8   #include <algo.h>
    9   
   10   set<double,less<double> > SetA;
   11   set<double,less<double> >::iterator SItr;
   12   
   13   double Half(double &X)
   14   {
   15        double Y = 0.5;
   16        double Z;
   17        Z = X * Y;
   18        return(Z);
   19   }
   20   void main(void)
   21   {   
   22      int Fd[2];
   23      ifstream In;
   24      ofstream Out;
   25      double X = 14.2;
   26      double Y = 6.2;
   27      double M = 24.12;
   28      double Z = 1000;
   29      SetA.insert(X);
   30      SetA.insert(Y);
   31      SetA.insert(M);
   32      SetA.insert(Z);
   33      int Pid;
   34      pipe(Fd);
   35      Pid = fork();
   36      if(Pid == 0){
   37        close(Fd[1]);
   38        In.attach(Fd[0]);
   39        
   40        SItr = SetA.begin();
   41        while(SItr != SetA.end())
   42        {
   43            In >> Z;
   44            cout << *SItr << " halved is " << Z << endl;
   45            SItr++;
   46        }
   47        In.close();
   48      }
   49      else{
   50           close(Fd[0]);
   51           Out.attach(Fd[1]);
   52           ostream_iterator<double> Itr(Out," ");
   53           transform(SetA.begin(),SetA.end(),Itr,Half);
   54           Out.close();
   55           
   56      }  
   57     
   58   }     
   59       
   60