Parse fixed width text file with c++

[CppisPuzzling]

Hello,

I am trying to read, modify, and output the modified file into another text file. I understand how to read a text file and output the file with an array. However, I am getting stuck because an array look at white space to move to the next array. In which my text file is in a fixed width format therefore even if there is no space between a character it could be representing a new column. If anybody know of a specific fixed width function I could use to split the data into separate variables that would be great. Any help of resource is greatly appreciated.

Thank you