I tried to calculate $scope values through angular controller. For instance: the below code works in order to multiply values inside brackets. However, addition(+) is working like 400+200 = 400200. How to get output 600?
$scope.output = ($scope.quantity.Quantity * $scope.pro_price) + $scope.wait_price;
You need to parse the variable, since your scope variable might be of type string,
$scope.output = ($scope.quantity.Quantity * $scope.pro_price) + parseInt($scope.wait_price);
use like this
$scope.output = ($scope.quantity.Quantity * $scope.pro_price) - ( -1 * $scope.wait_price);
You could also use Unary Plus operator to get the summation correct.
Here is what you could do.
$scope.output = ($scope.quantity.Quantity * $scope.pro_price) + (+$scope.wait_price);
A working example of this explanation is here.
var valueOne = 1;
var valueTwo = "20";
console.log("Regular + operator", (valueOne + valueTwo));
console.log("Unary + operator", (valueOne + (+valueTwo)));