Fortran Identifiers

A Fortran identifier must satisfy the following rules: Except for strings, Fortran 90 is not case sensitive. Therefore, identifier Name is identical to name, nAmE, NAme, NamE and namE. Similarly, PROGRAM is identical to program, PROgram, and progRAM. In this course, all keywords such as PROGRAM, READ, WRITE and END are in upper case and other identifiers use mixed cases.