Type the following expressions: 7==7 1 a b c==' a b c ' # a b c==# a b c How d

step 1 evaluate the expression. So it gives us that B equals 3 and C equals 7. So we really just have t

Type the following expressions: 7==7 1 a b c==' a...

Key Concepts

Canonical Representation

Many programming languages and systems don’t necessarily print expressions exactly as they were input. Instead, they convert values to a standard, canonical form when displaying them. This means that syntactic details like extra spaces or specific quoting conventions might be altered by the system’s pretty?printer to ensure consistency, even though the underlying value remains unchanged.

Read–Eval–Print Process

Interactive environments typically work by reading an expression, evaluating it, and then printing the result. The printed output is generated by a ‘show’ or pretty?printing function that produces a canonical representation of the value, rather than reproducing the original source. This read–eval–print cycle explains why an expression might be displayed differently than how it was typed.

Literal Notation and Quoting

Literals such as numbers, strings, or symbols often have both a syntactic form and an internal representation. In many systems, string or character sequence literals are treated specially: whitespace and quoting are managed during parsing and then normalized when the value is printed. This behavior ensures that comparisons between values reflect their canonical internal structure, not their original textual form.

Tokenization and Whitespace Handling

When an expression is read, the system tokenizes the input according to its grammar rules. This process can involve normalizing whitespace and handling special characters (like quotes or delimiters) in a predefined way. As a result, expressions that might appear different at first glance can become identical in their underlying, canonical representation once tokenized and printed.

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