The basic components of the Fortran language are its character set . From these components, we build the tokens that have a syntactic meaning to the compiler. There may be 39 continuation lines, and 132 characters per line.
Blanks are significant.
Automatic conversion of source form for existing programs can be carried out by convert.f90 . Fortran has five intrinsic data types . For each there is a corresponding form of literal constant . These functions are important for portable numerical software. Arrays are considered to be variables in their own right.