J3/97-257 Date: November 10, 1997 To: J3 From: Tony Warnock Subject: Fortran Character Set For use with Interval Arithmetic and in other features to be determined later, the following extensions to the Fortran Character set are proposed: 1. The characters "[" and "]" also known as the "Left Square Bracket" and the "Right Square Bracket" respectively. These characters are intended to be used somewhat like parentheses in a manner to be determined later. They are not intended to occur in variable names, operator names, or in other places wherein an alphanumeric character may occur. 2. The characters "{" and "}" also known as the "Left Curly Bracket" and the "Right Curly Bracket" respectively. These characters are intended to be used somewhat like parentheses in a manner to be determined later. They are not intended to occur in variable names, operator names, or in other places wherein an alphanumeric character may occur. 3. The character "@" also known as the "Commercial At." This character will be used in a manner to be determined later. It is not intended to occur in variable names. 4. The character "#" also known as the "Number Sign." This character will be used in a manner to be determined later. It is not intended to occur in variable names. 5. The character "\" also known as the "Reverse Slant." This character will be used in a manner to be determined later. It is not intended to occur in variable names. 6. The character "~" also known as the "Tilde." This character will be used in a manner to be determined later. It is not intended to occur in variable names. 7. The character "`" also known as the "Grave Accent." This character will be used in a manner to be determined later. It is not intended to occur in variable names. 8. The character "|" also known as the "Vertical Bar." This character will be used in a manner to be determined later. It is not intended to occur in variable names.