C/C++ Review and Basics

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;}

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;}

Types and Characters

• Types– int– string– others?

• Characters– alternative to endl?

Types and Characters

• Types– int– string– others?

• Characters– alternative to endl?

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); //overloadingvoid print(int oldest, int avg_age); //of print function//operator overloading possible as wellvoid calc (Person* f_people, int* f_oldest, double* f_avg_age);

Mainint 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;}

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;}

printvoid 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;}

calcvoid 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 }