# Sum Numbers from File

This week we’re going to work with file.

You’re given a file named nums.dat and need to calculate the sum of all integer values in the file.

# Sum Numbers in File

For this problem you are given a file named nums.dat that contains integers across multiple lines. There are multiple lines, and there may be 1 or more integers on each line.

The calculateSum method, defined below, should return the sum of all integers in the file nums.dat.

As an example, let's say nums.dat contains the following.

1 3 5 2 122
156


calculateSum should return 289 because $$\large 1 + 3 + 5 + 2 + 122 + 156 = 289$$

Your task is to implement calculateSum so that it returns the correct value for the entire file.