I am doing this on C++

How would I put the contents of this file it into a string?

The file contains lines of either a Roman Numeral or an Arabic Numeral

The lines should follow this format :

Roman numeral field 15 characters -

Arabic numeral field 4 characters

If a line only contains a Roman Numeral it needs to be converted into an Arabic Numeral and vice versa( I have already done this part)

My question is how would I put a Roman Numeral or an Arabic numeral from the file and into a string variable without taking in the rest of the blank space of the line?

Eg: Line from program:" 123 "

What I want in a string variable "123"

Line from program:" XXVII "

What I want in a string variable "XXVII"

File input begins:

XXVII

123

MCLXV

1975

File input ends