// Standard Deviation - A Program in c++ by Craig // //Defines a Class or Persons with an overloaded default constructor. //Defines a function to find the standard deviation of all ages #include #include #include class Person { private: std::string name; int age; public: Person(); Person(std::string newName, int newAge); void setName(std::string newName); void setAge(int newAge); std::string getName(); int getAge(); }; Person::Person() { setName(""); setAge(0); } Person::Person(std::string newName, int newAge) { setName(newName); setAge(newAge); } void Person::setName(std::string newName) { name = newName; } void Person::setAge(int newAge) { age = newAge; } std::string Person::getName() { return name; } int Person::getAge() { return age; } double stdDev(Person theArray[], int num) { double avgAge = 0.0, variance = 0, stdDev = 0; for (int x = 0; x < num; x++)//Find the average of the ages { avgAge += theArray[x].getAge(); } avgAge /= num; for (int y = 0; y < num; y++)//Find the variance of the numbers { variance += pow((theArray[y].getAge() - avgAge), 2); } variance /= num; stdDev = sqrt(variance);//Square Root of the variance is the standard deviation return stdDev; } int main() { const int howMany = 17; Person person1("Sam", 50); Person person2("Frodo", 51); Person person3("Gandalf", 200); Person person4("Aragorn", 70); Person person5("Sauron", 500); Person person6("Bilbo", 111); Person person7("Gollum", 250); Person person8("Arwen", 500); Person person9("Gimli", 40); Person person10("Boromir", 35); Person person11("Merry", 48); Person person12("Pippin", 45); Person person13("Legolas", 350); Person person14("Sauron", 321); Person person15("Tom", 462); Person person16("Elrond", 564); Person person17("Arwen", 330); Person anArray[howMany] = {person1, person2, person3, person4, person5, person6, person7, person8, person9, person10, person11, person12, person13, person14, person15, person16, person17}; std::cout << "The Standard Deviation is: " << stdDev(anArray, howMany) << std::endl; return 0; }