PGI Fortran Reference manual - The Portland Group

Language OverviewCharacterDescription\0 null\'apostrophe (does not terminate a string)\" double quotes (does not terminate a string)\\ \\x x, where x is any other character\dddcharacter with the given octal representation.1.3. Free Form FormattingUsing free form formatting, columns are not significant for the elements of a Fortran line, and ablank or series of blanks or tabs and the context of a token specify the token type. The followingrules apply to free form formatting:‣ Up to 132 characters are valid per line, and the compiler option –Mextend does not apply.‣ A single Fortran line may contain multiple statements, with the ; (semicolon) separatingmultiple statements on a single line.‣ Free format labels are valid at the start of a line.‣ The label must be separated from the remaining statements on the line by at least oneblank or a .‣ Labels consist of a numeric field drawn from digits 0 to 9.‣ The label cannot be more than 5 characters.‣ Either a blank line, or the ! character following a Fortran line indicates a comment. TheFortran text does not contain any of the characters after the !.‣ The & character at the end of a line means the following line represents a continuation line.‣ If a continuation line starts with the & character, then the characters following the & arethe start of the continuation line.‣ If the continuation line does not start with a &, then all characters on the line are part ofthe continuation line, including any initial blanks or tabs.A single Fortran line may contain multiple statements. The ; (semicolon) separates multiplestatements on a single line. Free format labels are valid at the start of a line, as long as the labelis separated from the remaining statements on the line by at least one blank or a . Labelsconsist of a numeric field drawn from digits 0 to 9. The label cannot be more than 5 characters.1.4. Fixed FormattingThis section describes the two types of fixed formatting that PGI Fortran compilers support:column formatting and tab formatting.PGI Fortran Reference Guide 4