I received a question:
…I've always been curious about code like this: IF wParam=ASC("a") wParam=ASC("b") ENDIF Is it more appropriate to think of ASC("a") as the Fox equivalent of a C 'a', or is it an actual function call every time through?
It’s easy to test this.
Try running this code:
num=1e7 && 1e7 is 10 * 1e6 (3,6,9 are thousand, million, billion) = 10 * 1 million
FOR i = 1 TO num
On my machine, the 2nd loop is 20-25% faster.
Of course an optimizing compiler could transform the 1st loop to the 2nd. In fact, a really good optimizing compiler would remove the loop completely!
In C and C++, the literal ‘a’ is exactly equal to 97, even at runtime, whereas the literal “a” (notice the single vs double quotes) is a string represented as a 2 byte array of 97 followed by a terminating 0.
The ASC() function takes any string expression as a parameter, including possibly a function call, so it cannot be optimized out in general.