Add sampleParser.cpp

sampleParser.cpp

+#include <iostream>
+#include <string>
+#include <fstream>
+
+using std::cout;
+using std::endl;
+using std::string;
+using std::ifstream;
+
+int main(void)
+{
+  ifstream in;
+  string fileName = "nums.txt";
+  in.open(fileName);
+  
+  // check the file was successfully opened for reading; quit upon failure
+  if(!in.is_open())
+  {
+    cout << "Cannot open file" << endl;
+    return 1;
+  }
+  
+  string a,b,c,d;
+  float num;
+  
+  // the first line of the file contains headers that must be read into a
+  // string, rather than a float -> read the headers separately
+  in >> a >> b >> c >> d;
+  
+  in >> num; // first reading operation before the loop, so that its 
+             // success can be checked as the entry condition of the loop
+             
+  // this loop will exit upon reading failure
+  while(in) // alternative: while(!in.fail())
+  {
+    /* do something with num */
+    in >> num;
+  }
+  
+  
+  in.close();
+}
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