calci1/index.js

var calculator = require('./calci');
var x=50 , y=10;
console.log("Addition of 50 and 10 is "+calculator.add(x,y));
console.log("Subtraction of 50 and 10 is "+calculator.sub(x,y));
console.log("Multiplication of 50 and 10 is "+calculator.mult(x,y));
console.log("Division of 50 and 10 is "+calculator.div(x,y));