Created a new branch Calculator and added Calculator.java class

Author: pritom-banik

src/main/java/Student/Calculator.java

@@ -0,0 +1,19 @@
+package Student;
+
+public class Calculator {
+    public float Add(float a,float b){
+        return  a+b;
+    }
+    public float Sub(float a,float b){
+        return a-b;
+    }
+    public float mul(float a,float b){
+        return a*b;
+    }
+    public float div(float a,float b){
+        if(b==0){
+            throw new ArithmeticException("Cannot divide by zero");
+        }
+        return a/b;
+    }
+}