rename lab 3

labs/debugging/roads.cpp

@@ -0,0 +1,68 @@
+#include <iostream>
+#include <vector>
+#include <cmath>
+#include <fstream>
+
+#include "line.h"
+
+
+
+// A helper function to parse a collection of files from an input file.
+std::vector<Line>& load(std::ifstream &istr) {
+  std::vector<Line> roads;
+  float x1,y1,z1,x2,y2,z2;
+  while (istr >> x1 >> y1 >> z1 >> x2 >> y2 >> z2) {
+    roads.push_back(Line(Point(x1,y1,z1),Point(x2,y2,z2)));
+  }
+  return roads;
+}
+
+
+// A helper function to sort our road collection by gradient (steepest first).
+void organize(std::vector<Line> &roads) {
+  std::sort(roads.begin(),roads.end(), steeper_gradient);
+}
+
+
+// A helper function to print data about the collection of roads.
+void print(const std::vector<Line> &roads) {
+
+  // print each road in the current, sorted order (steepest first)
+  for (int i = 0; i < roads.size(); i++) {
+    std::cout << roads[i] << std::endl;
+  }
+
+  // count the number of roads with gradient less than 10%
+  int count;
+  for (unsigned int i = roads.size() - 1;
+       i >= 0  && gradient(roads[i]) < 10.0;
+       i--) {
+    count++;
+  }
+  std::cout << "There are " << count << " road(s) with gradient less than 10%." << std::endl;
+}
+
+
+// This program expects a single argument, the name of the file containing our input data.
+int main (int argc, char* argv[]) {
+
+  // check the arguments and open the input file for reading
+  if (argc != 2) {
+    std::cerr << "ERROR: Usage: " << argv[0] << " <input_file>" << std::endl;
+    return 1;
+  }
+  std::ifstream istr(argv[1]);
+  if (!istr.good()) {
+    std::cerr << "ERROR: the file " << argv[1] << " was not successfully opened for reading." << std::endl;
+    return 1;
+  }
+
+  // load the data from the input file
+  std::vector<Line> roads = load(istr);
+
+  // sort the roads by gradient, and print information about the roads
+  organize(roads);
+  print(roads);
+}
+
+