diff --git a/fibonacci_number/FibonacciNumber.cpp b/fibonacci_number/FibonacciNumber.cpp
new file mode 100644
index 00000000..184cb369
--- /dev/null
+++ b/fibonacci_number/FibonacciNumber.cpp
@@ -0,0 +1,33 @@
+#include <iostream>
+
+using namespace std;
+
+//function to return nth fibonacci number
+int fibonacci(int n)
+{
+    if(n == 1 || n == 2){
+        return n-1;
+    }
+    
+    int a = 0;//second last fibonacci number
+    int b = 1;//last fibonacci number
+    int sum = 0;//current fibonacci number
+    
+    for (int i = 2; i < n; i++) {
+        sum = a + b;
+        a = b;
+        b = sum;
+    }
+    return sum;
+}
+
+int main()
+{
+    int n = 7;
+    if(n <= 0){
+        cout << "n must be always be greater than 0.";
+        return 0;
+    }
+    cout << fibonacci(n);
+    return 0;
+}