diff --git a/functions b/functions
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diff --git a/functions.cpp b/functions.cpp
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+++ b/functions.cpp
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+#include <iostream>
+
+using namespace std;
+
+int takeDamage(int attack, int defense) {
+    int damage = attack - defense;
+
+    if (damage < 0) {
+        damage = 0;
+    }
+
+    return damage;
+}
+
+int main() {
+    int damage = takeDamage(9, 5);
+    cout << damage;
+}
diff --git a/hello_world b/hello_world
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