Download Programming Language Concepts (Undergraduate Topics in by Peter Sestoft PDF

By Peter Sestoft

Programming Language ideas makes use of a practical programming language (F#) because the metalanguage during which to offer all options and examples, and hence has an operational flavour, allowing sensible experiments and workouts. It comprises easy innovations akin to summary syntax, interpretation, stack machines, compilation, variety checking, and rubbish assortment innovations, in addition to the extra complex subject matters on polymorphic forms, style inference utilizing unification, co- and contravariant forms, continuations, and backwards code new release with on-the-fly peephole optimization.

Programming Language recommendations covers sensible building of lexers and parsers, yet now not commonplace expressions, automata and grammars, that are good coated in other places. It throws gentle at the layout and expertise of Java and C# to reinforce students’ realizing of those common languages.

The examples current a number of interpreters and compilers for toy languages, together with a compiler for a small yet usable subset of C, numerous summary machines, a rubbish collector, and ML-style polymorphic sort inference. every one bankruptcy has routines in line with such examples.

Complete instance resource records, lecture slides and different fabrics can be found at http://www.itu.dk/people/sestoft/plc/

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No: jump to the else block • Print i followed by odd • Increment i (the statement after the condition) • Is i less than or equal to 10? Yes: jump to the block • Is the remainder of i ÷ 2 equal to 0? Yes: jump to the if block • Print i followed by even • … The remainder operator, while rarely seen outside of elementary school, turns out to be really useful when programming. You'll see it turn up everywhere from zebra striping tables to partitioning data sets. 3 Control Structures Switch Suppose we wanted to write a program that printed the English names for numbers.

Go:11: undefined: x The compiler is telling you that the x variable inside of the f function doesn't exist. It only exists inside of the main function. The range of places where you are allowed to use x is called the scope of the variable. Ac- 43 Variables cording to the language specification “Go is lexically scoped using blocks”. Basically this means that the variable exists within the nearest curly braces { } (a block) including any nested curly braces (blocks), but not outside of them. Scope can be a little confusing at first; as we see more Go examples it should become more clear.

In this case there is nothing after the for loop so we exit the program) 2. After we run the statements inside of the block we loop back to the beginning of the for statement and repeat step 1. Control Structures 50 The i = i + 1 line is extremely important, because without it i <= 10 would always evaluate to true and our program would never stop. (When this happens this is referred to as an infinite loop) As an exercise lets walk through the program like a computer would: • Create a variable named i with the value 1 • Is i <= 10?

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