Each type-expression is a character-string with up to 10 characters.

Lower-case letters are used for scalars:

• b is the type-expression for a Boolean scalar.
• i is the type-expression for an integer scalar.
• r is the type-expression for a real scalar.

Capital letters are used for arrays:

• B is the type-expression for a Boolean array.
• I is the type-expression for an integer array.
• R is the type-expression for a real array.

The type-expression for a procedure or a function is a string containing the > character. If the procedure or function has n arguments then the > character is preceded by n letters showing the types of the n arguments, in the appropriate order. The type-expression of a procedure ends with the > character. The type-expression of a function has a single letter after the > character showing the type of its returned value. Some examples are:

• iii>r is the type-expression for a real function with three integer arguments.

• ir>b is the type-expression of a Boolean function with an integer argument followed by a real argument.

• >i is the type-expression of an integer function with no arguments.

• rrr> is the type-expression of a procedure with three real arguments.

• > is the type-expression of a procedure with no arguments.

Kenneth E. Batcher - 2/12/99