111111.25 U I4 .6 &WJROCOPY RESOLUTION TEST CHART

ABSTRACT A RATFOR is a preprocessor for Fortran that provides modern control structures and a substantial improvement in the syntax < of Fortran programs. The output of RATFOR is a Fortran program that is compiled by the Fortran processors and then executed. The RATFOR preprocessor provides statement grouping, IF-ELSE structures and four loops: DO, FOR, WHILE and REPEAT-UNTIL. RATFOR source text is free format with multiple statements on a line. Upper and lower case letters are treated as upper case letters except in character constants. There is an include facility so that large programs can be constructed out of a mul-titude of small files without using the system editor. RATFOR accepts files consisting of fixed length 80 column records with imbedded tabs. The program described here is an adaptation of the original RATFOR processor written at Bell Laboratories for use in the CMS environment. This manual provides a detailed description of the processor and is intended for readers who wish ta modify the processor. The user's manual is Technical Xeiff6randum No. 79-5.&quot