@@ -0,0 +1,564 @@
+package ru.matevosyan;%0A%0Apublic class Calculator %7B%0A%0A%09private double result;%0A%0A%09%0A%09public double add(double first, double second)%7B%0A%09%09%0A%09%09this.result = first + second;%0A%09%09return this.result;%0A%09%09%09%09%0A%09%7D%0A%0A%09public double substruct(double first, double second)%7B%0A%09%09%09%0A%09%09this.result = first - second;%0A%09%09return this.result;%0A%09%09%0A%09%09%09%09%09%09%0A%09%7D%0A%0A%09public double div(double first, double second)%7B%0A%09%09%09%09%0A%09%09this.result = first / second;%0A%09%09return this.result;%0A%09%09%0A%09%7D%0A%0A%09public double multiple(double first, double second)%7B%0A%09%09%09%09%0A%09%09this.result = first * second;%0A%09%09return this.result;%0A%09%09%09%09%09%09%0A%09%7D%0A%0A%09%0A%0A%7D%0A

add Calculator.java