Solutions

sheet1/B/file_io.cpp

@@ -0,0 +1,65 @@
+#include "file_io.h"
+#include <cassert>
+#include <fstream>
+#include <iostream>
+#include <stdexcept>
+#include <string>
+#include <vector>
+using namespace std;
+
+// [Str10, p.364]
+void fill_vector(istream& istr, vector<short>& v)
+{
+    double d=0;
+    while ( istr >> d) v.push_back(d); // Einlesen
+    if (!istr.eof())
+    { // Fehlerbehandlung
+        cout << " Error handling \n";
+        if ( istr.bad() )  throw runtime_error("Schwerer Fehler in istr");
+        if ( istr.fail() )   // Versuch des Aufraeumens
+        {
+            cout << " Failed in reading all data.\n";
+            istr.clear();
+        }
+    }
+    v.shrink_to_fit();                 // C++11
+    return;
+}
+
+
+void read_vector_from_file(const string& file_name, vector<short>& v)
+{
+    ifstream fin(file_name);           // Oeffne das File im ASCII-Modus
+    if( fin.is_open() )                // File gefunden:
+    {
+       v.clear();                      // Vektor leeren
+       fill_vector(fin, v);
+    }
+    else                               // File nicht gefunden:
+    {
+        cout << "\nFile " << file_name << " has not been found.\n\n" ;
+        assert( fin.is_open() && "File not found." );       // exeption handling for the poor programmer
+    }
+
+ return;
+}
+
+void write_vector_to_file(const string& file_name, const vector<double>& v)
+{
+    ofstream fout(file_name);          // Oeffne das File im ASCII-Modus
+    if( fout.is_open() )
+    {
+       for (unsigned int k=0; k<v.size(); ++k)
+       {
+          fout << v.at(k) << endl;
+       }
+    }
+    else
+    {
+        cout << "\nFile " << file_name << " has not been opened.\n\n" ;
+        assert( fout.is_open() && "File not opened."  );         // exeption handling for the poor programmer
+    }
+
+ return;
+}
+