justification of number field in output file

I created a abap program to write a file to my C drive. I have to create this file with the fields in certain columns and the numeric fileds are causing me problems. is there a way to left-justify the numeric values so that they all end in the same column. this way I can control the spacing of the rest of the fields. I have checked the forum and can not find anything on this. I have also did the F1 on the DATA field so see some help but there is no explaination for it.