diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..fed6709
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,23 @@
+name: Build C++
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  install:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y -f build-essential g++ cmake
+  build:
+    needs: install
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Build project
+        run: g++ GameDie.cpp -std=c++17 -Wall -Werror
diff --git a/GameDie.cpp b/GameDie.cpp
index d512405..4995e3e 100644
--- a/GameDie.cpp
+++ b/GameDie.cpp
@@ -6,27 +6,27 @@
 //class constructor that seeds the random number generator
 GameDie::GameDie()
 {
-    srand(time(NULL));
-    counter.resize(FACES);
+	srand(time(NULL));
+	counter.resize(FACES);
 
-    for(int i=0; i<FACES; i++)
-      counter[i] = 0;
+	for(int i=0; i<FACES; i++)
+		counter[i] = 0;
 }
 
 //overloaded constructor
 GameDie::GameDie(unsigned int num)
 {
-    if( num == 0 )
-    {
-        counter.resize(FACES);
-    }
-    else{
-        counter.resize(num);
-    }
-    for(int i=0; i<FACES; i++)
-    {
-        counter[i] = 0;
-    }
+	if( num == 0 )
+	{
+		counter.resize(FACES);
+	}
+	else{
+		counter.resize(num);
+	}
+	for(int i=0; i<FACES; i++)
+	{
+		counter[i] = 0;
+	}
 
 }
 
@@ -34,13 +34,31 @@ GameDie::GameDie(unsigned int num)
 // (inclusive) and return it
 int GameDie::roll()
 {
-    int roll = rand() % counter.size();
-    counter[roll]++;
-    return roll + 1;
+	int roll = rand() % counter.size();
+	counter[roll]++;
+	return roll + 1;
 }
 
 // return the count of how many times each face has been rolled, as a vector
 // where each face's count is at index face-1 (i.e. Face 1 is at index 0)
 vector <int> GameDie::get_distribution(){
-    return counter;
+	return counter;
+}
+
+//returns percentage of rolls for each face relative to the number of total rolls
+vector <double> GameDie::get_percentages() {
+	vector <int> rolls;
+	rolls = get_distribution();
+	vector <double> res;
+	int total = 0;
+
+	for(int i = 0; i < rolls.size(); i++) {
+		total += rolls[i];
+	}
+
+	res.resize(rolls.size());
+
+	for(int i = 0; i < res.size(); i++) {
+		res[i] = (double)rolls[i]/(double)total;
+	}
 }
diff --git a/GameDie.h b/GameDie.h
index 54d69ba..e5bec0b 100644
--- a/GameDie.h
+++ b/GameDie.h
@@ -11,6 +11,7 @@ class GameDie
    GameDie(unsigned int);
    int roll();
    vector <int> get_distribution();
+   vector <double> get_percentages();
 
   private:
    vector <int> counter;
diff --git a/README.md b/README.md
index 9a8fe2c..b652a03 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # GameDie
 
+[![Build C++](https://github.com/mcbillings/GameDie/actions/workflows/build.yml/badge.svg)](https://github.com/mcbillings/GameDie/actions/workflows/build.yml)
+
+
 This repository provides a class that represents a game die, such as the
 six-sided dice used in traditional dice game. While the die defaults to 
 six sides, the overloaded constructor allows the developer to customize
@@ -23,4 +26,4 @@ Once built, run the image:
 
 ...or run it with a bind mount to the current source code:
 
-`docker run --mount type=bind,source="$(pwd)",target=/usr/src -it cpp-container`
\ No newline at end of file
+`docker run --mount type=bind,source="$(pwd)",target=/usr/src -it cpp-container`