include slope program

lectures/17_exceptions/README.md

@@ -150,7 +150,7 @@ Here’s code using exceptions to sort a collection of lines by slope:
 #include <iostream>
 #include <vector>
 #include <algorithm>
-#include <cmath> // for fabs() function
+#include <cmath>
 
 class Point {
 public:
@@ -189,13 +189,29 @@ void organize(std::vector<Line> &lines) {
 
 int main () {
         std::vector<Line> lines;
-	/* omitting code to initialize some data */
+
+        // adding test lines
+        lines.push_back(Line(Point(0, 0), Point(1, 1)));  // slope = 1
+        lines.push_back(Line(Point(0, 0), Point(2, 3)));  // slope = 1.5
+        lines.push_back(Line(Point(0, 0), Point(5, 2)));  // slope = 0.4
+        // lines.push_back(Line(Point(3, 2), Point(3, 5)));  // vertical line (should throw)
         try {
                 organize(lines);
-	/* omitting code to print out the results */
+                // Print the sorted lines based on steepness
+                std::cout << "Sorted lines by steepest slope:" << std::endl;
+                for (const Line &ln : lines) {
+                        std::cout << "Line from (" << ln.a.x << ", " << ln.a.y << ") to ("
+                        << ln.b.x << ", " << ln.b.y << ") - Slope: ";
+                        try {
+                                std::cout << slope(ln) << std::endl;
+                        } catch (int) {
+                                std::cout << "undefined (vertical line)" << std::endl;
+                        }
+                }
         } catch (int) {
                 std::cout << "error: infinite slope" << std::endl;
         }
+        return 0;
 }
 ```
 

lectures/17_exceptions/slope.cpp

@@ -0,0 +1,66 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <cmath>
+
+class Point {
+public:
+	Point(double x_, double y_) : x(x_),y(y_) {}
+	double x,y;
+};
+class Line {
+public:
+	Line(const Point &a_, const Point &b_) : a(a_),b(b_) {}
+	Point a,b;
+};
+
+double compute_slope(const Point &a, const Point &b) {
+	double rise = b.y - a.y;
+	double run = b.x - a.x;
+	double epsilon = 0.00001;
+	if (fabs(run) < epsilon){
+		throw -1;
+	}
+	return rise / run;
+}
+
+double slope(const Line &ln) {
+	return compute_slope(ln.a,ln.b);
+}
+
+bool steeper_slope(const Line &m, const Line &n) {
+	double slope_m = slope(m);
+	double slope_n = slope(n);
+	return slope_m > slope_n;
+}
+
+void organize(std::vector<Line> &lines) {
+	std::sort(lines.begin(),lines.end(), steeper_slope);
+}
+
+int main () {
+	std::vector<Line> lines;
+
+	// adding test lines
+	lines.push_back(Line(Point(0, 0), Point(1, 1)));  // slope = 1
+	lines.push_back(Line(Point(0, 0), Point(2, 3)));  // slope = 1.5
+	lines.push_back(Line(Point(0, 0), Point(5, 2)));  // slope = 0.4
+	// lines.push_back(Line(Point(3, 2), Point(3, 5)));  // vertical line (should throw)
+	try {
+		organize(lines);
+		// Print the sorted lines based on steepness
+		std::cout << "Sorted lines by steepest slope:" << std::endl;
+		for (const Line &ln : lines) {
+			std::cout << "Line from (" << ln.a.x << ", " << ln.a.y << ") to ("
+			<< ln.b.x << ", " << ln.b.y << ") - Slope: ";
+			try {
+				std::cout << slope(ln) << std::endl;
+			} catch (int) {
+				std::cout << "undefined (vertical line)" << std::endl;
+			}
+		}
+	} catch (int) {
+		std::cout << "error: infinite slope" << std::endl;
+	}
+	return 0;
+}