As of Delphi 4, Delphi supports dynamic arrays. You can modify their sizes at run time and they will retain the data you stored in other elements at the old size. They can hold elements of any homogeneous type, including records and other arrays. You can declare a dynamic array the same as you declare … Read more
Here is what the book says on page 205: If you’re familiar with operating system architecture, you might be interested to know that local variables and function arguments are stored on the stack, while global and static variables are stored on the heap. This is definitely an error in the book. First, one should discuss … Read more
Python gives the programmer a large number of tools for introspecting the running environment. globals() is just one of those, and it can be very useful in a debugging session to see what objects the global scope actually contains. The rationale behind it, I’m sure, is the same as that of using locals() to see … Read more
How about just using the built-in types like this: config = { “mysql”: { “user”: “root”, “pass”: “secret”, “tables”: { “users”: “tb_users” } # etc } } You’d access the values as follows: config[“mysql”][“tables”][“users”] If you are willing to sacrifice the potential to compute expressions inside your config tree, you could use YAML and end … Read more
How do I share global variables across modules? The canonical way to share information across modules within a single program is to create a special module (often called config or cfg). Just import the config module in all modules of your application; the module then becomes available as a global name. Because there is only … Read more
Globals in Python are only global to their module. There are no names that you can modify that are global to the entire process. You can accomplish what you want with this: globals.py: value = 0 def default(): global value value = 1 main.py: import globals def main(): globals.default() print globals.value if __name__ == “__main__”: … Read more
A variable length array (i.e. an array sized with a runtime value) can’t be a global variable, because the expression you are using for the size must obviously be computed at compile time. It can only live on the stack. Presumably what you are getting is a static array with a size that depends on … Read more
Because in the first code, you have created a local variable var and used its value, whereas in the 2nd code, you are using the local variable var, without defining it. So, if you want to make your 2nd function work, you need to declare : – global var in the function before using var. … Read more
You can’t execute code outside of functions. The only thing you can do at global scope is declaring variables (and initialize them with compile-time constants). malloc is a function call, so that’s invalid outside a function. If you initialize a global pointer variable with malloc from your main (or any other function really), it will … Read more