All about file IO in C++ by Yordanov I.

By Yordanov I.

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Now, when we call print(), Lua will look for __tostring in the metatable and find this function. The end result is a much more descriptive output. Now that we’ve dipped our toes in with an easy function, let’s look at a more complicated case. Reading and Writing By design, Lua’s tables are pretty forgiving. If you try to read a key that’s not in the table, nothing bad happens; you just get nil back. Say you wanted to create a stricter table, where reading a nonexistent key, or overwriting an existing key, caused a runtime error.

Now, write a similar function called is_prime(num) to test if a number is prime (that is, it’s divisible only by itself and 1). • Create a program to print the first n prime numbers that end in 3. Do (Medium): • What if Lua didn’t have a for loop? Using if and while, write a function for_loop(a, b, f) that calls f() on each integer from a to b (inclusive). Do (Hard): • Write a function reduce(max, init, f) that calls a function f() over the integers from 1 to max like so: function add(previous, next) return previous + next end report erratum • discuss Chapter 1.

28 That means our midi_send() Lua function will take three arguments: the message number, plus the two numeric parameters. When Lua encounters a call like the following one: midi_send(144, 60, 96) …it will push the values 144, 60, and 96 onto the stack, then jump into our C++ function. We’ll need to retrieve these parameters by their position on the stack. The top of the stack is at index -1 in Lua; this would be the last value pushed, or 96. Because Lua is dynamically typed, these values could be anything: numbers, strings, tables, functions, and so on.

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