diff --git a/CPP/gcd_theorem.cpp b/CPP/gcd_theorem.cpp
new file mode 100644
index 0000000..3d223c6
--- /dev/null
+++ b/CPP/gcd_theorem.cpp
@@ -0,0 +1,18 @@
+#include <iostream>
+using namespace std;
+
+int GCD(int a, int b)
+{
+	if (!b)                   //if b==0
+		return a;
+	else
+		return GCD(b,a%b);
+}
+
+int main()
+{
+	cout<<"Provide two number (separated by space) whose HCF is to be found: ";
+	int a,b;
+	cin>>a>>b;
+	cout<<endl<<"HCF of "<<a<<" and "<<b<<" is "<<GCD(a,b)<<endl;
+}