added files from lecture 2

averager.cpp

@@ -0,0 +1,20 @@
+#include <iostream>
+using namespace std;
+
+// 1. read in two numbers
+// 2. calculate the average (n1 + n2)/2
+// 3. print out the average
+
+int main(){
+  float num1 = 0;
+  float num2 = 0;
+
+  cout << "Enter a number: ";  
+  cin >> num1;
+  cout << "Enter another number: ";
+  cin >> num2;
+
+  cout << "The average is " << (num1 + num2)/2 << endl;
+
+  return 0;
+}

choosing.cpp

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+#include <iostream>
+using namespace std;
+
+int main(){
+  // bool has two values: true and false
+  bool isItTrue = (false == 0);
+  cout << isItTrue << endl;
+  
+  //cout << "Is it...?(true/false): ";
+  //cin >> isItTrue;
+  
+  if(isItTrue){
+    cout << "It is!" << endl;
+  }
+  else{
+    cout << "It ain't" << endl;
+  }
+}

hello.cpp

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+#include <iostream>
+using namespace std;
+
+int main(){
+  cout << "Hello world" << endl;
+
+  return 0;
+}

inverter.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+using namespace std;
+
+// program should read in a number and return 1/the number
+
+int main(){
+  float ourNum;
+  cout << "Enter a number to invert: ";
+  cin >> ourNum;
+  if( ourNum != 0){
+    cout << "The inverse of that number is: " 
+      << 1/ourNum << endl;
+  }
+  else {
+    cout << "You can't invert 0, you jerk" << endl;
+  }
+  return 0;
+}

looping.cpp

@@ -0,0 +1,12 @@
+#include <iostream>
+using namespace std;
+
+int main(){
+  int ourNum = 0;
+
+  while(ourNum < 10){
+    cout << "Enter a number: ";
+    cin >> ourNum;
+  }
+  cout << "Congrats you entered something >= 10" << endl;
+}