Fixed the program to correctly sort values in depending order. Also added documentation.

Makefile

@@ -0,0 +1,2 @@
+all:
+	g++ -Wfatal-errors main.cpp

README.md

@@ -0,0 +1,12 @@
+# Trio
+
+This C++ program receives three integers and tells the user the numbers in descending (largest-to-smallest) order.
+
+## Getting Started
+
+To run the program do the following in your command line interface prompt ($):
+
+```
+$make
+$./a.out
+```

main.cpp

@@ -1,21 +1,43 @@
 #include <iostream>
-using namespace std;
+using std::cout;
+using std::cin;
+using std::endl;
+
+void sortDescending(int,int,int);
+void swap(int&,int&);
 
 int main()
 {
-  //DO NOT CHANGE WITHIN THIS AREA...
-  int red, blue, green;
-  cout<<"Enter Red, Green, and Blue values: ";
-  cin>>red>>green>>blue;
-  //...END OF "DO NOT CHANGE" AREA
-
-
+  int numA, numB, numC;
+  cout<<"Enter any three numbers: ";
+  cin>>numA>>numB>>numC;
 
+  sortDescending(numA, numB, numC);
+
+  cout<<"From greatest to least, they are: ";
+  cout<<numA<<","<<numB<<","<<numC<<endl;
+  return 0;
+}
 
+void sortDescending(int first, int second, int third)
+{
+  if( first < third )
+  {
+    swap(first,third);
+  }
+  if( first < second )
+  {
+    swap(first,second);
+  }
+  if( second < third )
+  {
+    swap(second,third);
+  }
+}
 
-  //DO NOT CHANGE WITHIN THIS AREA...
-  cout<<"Rearranged....\n";
-  cout<<"RGB: "<<red<<","<<green<<","<<blue<<endl;
-  return 0;
-  //...END OF "DO NOT CHANGE" AREA
-}
+void swap(int &a, int &b)
+{
+  int temp = a;
+  a = b;
+  b = temp;
+}