Parva, as so far defined, has only two basic types (integer and Boolean) which are quite distinct from one another. Languages derived from C have another fundamental type char that is somewhat of a hybrid. One can usually combine operands of char and int types quite freely, treating them effectively all as integers. A character literal can be thought of as being of char type so that code like
would output the character A. Code like
is also acceptable but would output the number 65 (the ASCII encoding of the character A). In short, an expression containing integer and character operands is deemed to be of integer type unless it is composed of a single character operand. When necessary, one is allowed to make explicit casts, as exemplified by
Add a character type to Parva, paying careful attention to constraint analysis. As an alternative to the rather permissive rules inspired by C-like languages you might like to consider following the Pascal/ Modula-2 model, which dictates that character and integer operands cannot be mixed freely in expressions or assigned freely one to another – any mixing has to be done by making use of explicit conversion mechanisms.
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