diff --git a/factorial.cpp b/factorial.cpp
new file mode 100644
index 0000000..a8d489e
--- /dev/null
+++ b/factorial.cpp
@@ -0,0 +1,15 @@
+#include "functions.h"
+#include <bits/stdc++.h>
+using namespace std;
+int factorial(int n){
+    if(n < 0)
+    {   // Added changes for negative numbers
+        cout<<"Enter a positive no. as an input \n";
+        return -1;
+    }
+    else if(n!=1){
+	return(n * factorial(n-1));
+    }
+    else return 1;
+}
+// Vishwas Made a change
diff --git a/functions.h b/functions.h
new file mode 100644
index 0000000..89f8d84
--- /dev/null
+++ b/functions.h
@@ -0,0 +1,3 @@
+void print_hello();
+int factorial(int n);
+int gcd(int a, int b);
diff --git a/gcd.cpp b/gcd.cpp
new file mode 100644
index 0000000..e1789b8
--- /dev/null
+++ b/gcd.cpp
@@ -0,0 +1,7 @@
+#include <bits/stdc++.h>
+using namespace std;
+int gcd(int a, int b)
+{
+	if(!a) return b;
+	return gcd(b % a, a);
+}
diff --git a/hello.cpp b/hello.cpp
new file mode 100644
index 0000000..a69cc9a
--- /dev/null
+++ b/hello.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+#include "functions.h"
+using namespace std;
+void print_hello(){
+   printf("Hello World!");
+}
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..4b52130
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,11 @@
+#include <iostream>
+#include "functions.h"
+using namespace std;
+int main(){
+    print_hello();
+    int x = 56 , y = 98;
+    cout<<gcd(x,y)<<"\n";
+    cout<<"\n";
+    cout<<"The factorial of 5 is "<<factorial(5)<<"\n";
+    return 0;
+}