C/C++ Review and Basics

1. C/C++ Review and Basics

2. A Basic C++ Program #include <cstdlib> #include <iostream> #include <string> using namespace std; int main() { string first, last; cout << "Please enter your name: "; cin >> first >> last; cout << "Hello, " << first << " " << last << "!" << endl; int age; cout << "How old are you? "; cin >> age; cout << "Great " << first << ", you are " << age << " years old!" << endl; return EXIT_SUCCESS; }

3. A Basic C++ Program #include <cstdlib> #include <iostream> #include <string> using namespace std; int main() { string first, last; cout<< "Please enter your name: "; cin>> first >> last; cout << "Hello, " << first << " " << last << "!" << endl; int age; cout << "How old are you? "; cin >> age; cout << "Great " << first << ", you are " << age << " years old!" << endl; return EXIT_SUCCESS; }

4. Types and Characters • Types • int • string • others? • Characters • alternative to endl?

5. Types and Characters • Types • int • string • others? • Characters • alternative to endl?

6. Header #include <cstdlib> #include <iostream> #include <string> using namespace std; struct Person { string name; int age; }; //no typedef const int MAX_PEOPLE = 10; //instead of #define string getName(); int getAge(); void print(Person* f_people); //overloading void print(int oldest, int avg_age); //of print function //operator overloading possible as well void calc (Person* f_people, int* f_oldest, double* f_avg_age);

7. Main int main() { Person* people = new Person[MAX_PEOPLE]; //new instead of malloc //Person people[MAX_PEOPLE]; -- alternative array declaration int oldest = 0; double avg_age = 0; for(int i = 0; i < MAX_PEOPLE; i++) { people[i].name = getName(); setAge(&people[i]); } print(people); calc(people, &oldest, &avg_age); print(oldest, avg_age); delete[] people; //delete instead of free return EXIT_SUCCESS; }

8. getName, setAge string getName() { string tmp_name; cout << "Enter name: "; cin >> tmp_name; return tmp_name; } void setAge(Person* f_person) { cout << "Enter age: "; cin >> f_person->age; }

9. print void print(Person* f_people) { int i = 0; while(i < MAX_PEOPLE) { cout << "Name of person number (" << (i+1) << "): " << f_people[i].name << endl; cout << "Age of person number (" << (i+1) << "): " << f_people[i].age << endl << endl; i++; } } void print(int oldest, double avg_age) { cout << "The oldest person is: " << oldest << "." << endl; cout << "The average age is: " << avg_age << "." << endl; }

10. calc void calc (Person* f_people, int* f_oldest, double* f_avg_age) { double avg_total = 0; for(int i = 0; i < MAX_PEOPLE; i++) { if(i == 0 || f_people[i].age > *f_oldest) { *f_oldest = f_people[i].age; } avg_total += f_people[i].age; } *f_avg_age = avg_total/(double)MAX_PEOPLE; //cast }