+#ifndef SCALAR_H\r
+#define SCALAR_H\r
+\r
+double sum(double x1,double x2);\r
+double fois(double x1,double x2);\r
+\r
+#endif\r
+\r
+/*----------------------------------------------------------------------*\\r
+ |* End *|\r
+ \*---------------------------------------------------------------------*/\r
+\r
+\r