added files made during the first lecture!

adder.cpp

@@ -0,0 +1,22 @@
+// read in two numbers and add them together
+// print the result
+#include <iostream>
+//without this line you need to write std::cin std::cout
+using namespace std;
+
+int main() {
+  int num1;
+  int num2;
+
+  cout << "Enter a number: " << endl;
+  cin >> num1;
+  cout << "Enter another number" << endl;
+  cin >> num2;
+
+  //test out what's in the named boxes
+  cout << "num1 contains: " << num1 << endl;
+  cout << "num2 contains: " << num2 << endl;
+  
+  cout << "Adding the two numbers: " << num1 + num2 << endl;
+  return 0;
+}

echo.cpp

@@ -0,0 +1,12 @@
+#include <iostream>
+using namespace std;
+
+int main(){
+  string stuff;
+  cout << "Enter a thing: " << endl;
+  cin >> stuff;
+
+  cout << "You said: " << stuff << endl;
+
+  return 0;
+}

order.cpp

@@ -0,0 +1,39 @@
+// Program to calculate cost of an order of pizzas
+// from how many people, cost of a pizza, slices per person, number of slices in a pizza
+// total cost = 1.25*(cost of a pizza * number of pizzas we need)
+// number of pizzas we need = number of people * slices per person / slices in a pizza
+
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+int main(){
+  int numOfPeople;
+  int slicesPerPerson;
+  float slicesInPizza = 12;
+  float numberOfPizzas;
+  //slicesInPizza = 12
+
+  float costPerPizza;
+  float totalCost;
+  float tipPercent = 1.25;
+
+  cout << "Enter the number of people: " << endl;
+  cin >> numOfPeople;
+  cout << "Enter the number of slices per person: " << endl;
+  cin >> slicesPerPerson;
+  cout << "Cost of a pizza: " << endl;
+  cin >> costPerPizza;
+
+  numberOfPizzas = ceil(numOfPeople * slicesPerPerson / slicesInPizza);
+
+  //cout << "Testing: " << numberOfPizzas << endl;
+
+  totalCost = tipPercent*(numberOfPizzas * costPerPizza); 
+
+  cout << "You bought: " << numberOfPizzas << " pizzas" << endl;
+  cout << "For a cost of: " << totalCost << " dollars" << endl;
+  
+  return 0;
+  
+}