Added Newton Raphson Method using C++

cpp/NonLinear_Methods/newton_raphson.cpp

@@ -0,0 +1,36 @@
+
+// C++ program for implementation of Newton Raphson Method 
+#include<bits/stdc++.h> 
+#define ERROR 0.001 
+using namespace std; 
+
+double func(double x) 
+{ 
+    return x*x*x - x*x + 2;  //Define a Function 
+} 
+
+double derivative(double x) 
+{ 
+    return 3*x*x - 2*x; //Define its derivative
+} 
+
+// Function to find the root 
+void NRaphson(double x) 
+{ 
+    double h = func(x) / derivative(x); 
+    while (abs(h) >= ERROR) 
+    { 
+        h = func(x)/derivative(x); 
+        x = x - h; 
+    } 
+
+    cout << "One of the roots is : " << x; 
+} 
+
+int main() 
+{ 
+    double x_0 = -10; // Initial Guess 
+    NRaphson(x_0); 
+    return 0; 
+} 
+