add autodiff

README.md

@@ -1,8 +1,10 @@
 # Project_Euler
+* cpp
+* julia 
+* go 
+* d
+* python 
+
+
+# AUTODIFF 
 
-cpp
-julia 
-go 
-d
-python 
-

autodiff/var.h

@@ -0,0 +1,40 @@
+/*
+* 2020.03.12 
+* tlming16 
+*/
+
+# ifndef VAR_H 
+#define  VAR_H 
+# include <string> 
+namespace mml{
+class var{ 
+public:
+    var():value_(0),grad_(1){ } 
+    var(double v,double g=1.0):value_(v),grad_(g){} 
+    var(const var &) =default; 
+    var(var &&) = default ;
+    var  operator =(const var &) = default ; 
+    var operator =(var &&) = default ; 
+    var operator + (const var &); 
+    var operator - (const var &); 
+    var operator / (const var &); 
+    var operator * (const var &);
+    static var sin(const var &) ;
+    static var cos(const var &);
+    static var tan(const var &);
+    static var exp(const var &); 
+    static var abs(const var &); 
+    static var log (const var &); 
+    static var pow (const var &); 
+    std::string str() const; 
+private:
+    double value_=0; 
+    double grad_=1; 
+
+}; 
+
+var make_var(double val){
+    return var(val,1.0); 
+}
+} // end of namespace mml 
+#endif