added implementation for shape triangle

exercises-cpp/jimoh_yusuf/ex02_oo_basics/src/Triangle.cpp

@@ -3,3 +3,28 @@
 //
 
 #include "Triangle.h"
+
+Triangle::Triangle(double h, double b) : height(h), base(b) {
+    number_of_sides = 3;
+}
+
+std::string Triangle::getType() {
+    return "Triangle";
+}
+
+double Triangle::calculatePerimeter() {
+    double perimeter = base + 2 * sqrt(height * height + (base * base / 4));
+    std::cout << "The perimeter of the triangle is " << perimeter << std::endl;
+    return perimeter;
+}
+
+double Triangle::calculateArea() {
+    double area = 0.5 * base * height;
+    std::cout << "The area of the triangle is " << area << std::endl;
+    return area;
+}
+
+int Triangle::getNumberOfSides() {
+    return number_of_sides;
+}
+

exercises-cpp/jimoh_yusuf/ex02_oo_basics/src/Triangle.h

@@ -5,15 +5,22 @@
 #ifndef TRIANGLE_H
 #define TRIANGLE_H
 
+#include "Shape.h"
+#include <iostream>
+#include <string>
+#include <cmath>
+
 class Triangle : public Shape {
 private:
-    double side1;
+    double height, base;
+
 public:
-    Triangle(double side);
+    Triangle(double height, double base);
 
     std::string getType() override;
+    double calculatePerimeter() override;
     double calculateArea() override;
     int getNumberOfSides() override;
 };
 
-#endif //TRIANGLE_H
+#endif // TRIANGLE_H