Python parser forbids naming variables that way, for the sake of parsing numbers and variables separately, as naming a variable 1e1 would create a chaos – is it the number 10.0 or the variable 1e1? “Python, please output for me 1e1!” – “Why is it 10.0? I stored 100 over there!” But the variables are … Read more
The only legal characters according to the standard are alphanumerics and the underscore. The standard does require that just about anything Unicode considers alphabetic is acceptable (but only as single code-point characters). In practice, implementations offer extensions (i.e. some do accept a $) and restrictions (most don’t accept all of the required Unicode characters). If … Read more
You could try something like this: #define DUMP(varname) fprintf(stderr, “%s = %x”, #varname, varname); I used to use this header I wrote, when I was new to C, it might contain some useful ideas. For example this would allow you to print a C value and provide the format specifier in one (as well as … Read more
Yes, it is case sensitive, just like the rest of UNIX. $date and $DATE are two different variables. makefile and Makefile are two different files. -h and -H are two distinct flags (usually).
What is the reasoning of those telling you this is bad? I do this all the time. It is the simplest, expressive way to name a single variable of a type. If you needed two Person objects then you could prefix person with meaningful adjectives like fastPerson slowPerson otherwise just person is fine with me.
If you’re just saving a single object, don’t use an .Rdata file, use an .RDS file: x <- 5 saveRDS(x, “x.rds”) y <- readRDS(“x.rds”) all.equal(x, y)
Because then a string of digits would be a valid identifier as well as a valid number. int 17 = 497; int 42 = 6 * 9; String 1111 = “Totally text”;
For static queries, like the one in your question, table names and column names need to be static. For dynamic queries, you should generate the full SQL dynamically, and use sp_executesql to execute it. Here is an example of a script used to compare data between the same tables of different databases: Static query: SELECT … Read more