What’s the difference btwn a command and function?

but functions can be written too

you wanna join the group?

Oh ok . What’s the difference btwn a command and function?

In this context

There’s a vim group too? Ofc

Thanks @marcotrosi

Dude the guy gave a solution hello? It’s for you

a command is mostly a one liner, and a function is sometimes bigger and can be invoked in various ways, typical script function

scenario:
I’m in Bash using vi mode, means I hit escape which puts me in vi mode
I press v which opens the current line in an actual vim instance
I can edit the line inside Vim
when I’m done with editing I quit Vim
the shell immediately executes the line

problem:
the shell immediately executes the line

wish:
it should only quit Vim and show the edited line without executing it

ideas:
I tried using :cquit hoping that the line is then not executed, but it doesnt work

question:
does anybody know if my wish can be fulfilled?

https://vi.stackexchange.com/questions/12547/vi-editing-of-bash-command-line-avoid-execution-upon-exit

#define square(x) x*x
int main() {
printf(“%d”, square(3+4));
}

the result if 19 and I wonder why?

because you forgot the parentheses

macros are just text replacement

so basically the text is
3+4*3+4
and that is 12 + 7 = 19

if you wanna do it correctly you need

#define square(x) (x)*(x)

then the result is

(3+4)*(3+4) = 49

https://github.com/marcotrosi/C/tree/master/09_functions#function-like-macros

thanks again

welcome

macros doesn’t return anything?

it’s text replacement

it just substitutes code right?

yes

only the preprocessor sees them

the compiler doesnt see them

the compiler already gets the replaced text

take this example int a = 128/square(8) what do u think is this output

you can see it with the -E option of gcc

int a = 128/8*8 right

gcc -E yourfile.c -o yourfile.p

oh right, then it’s even necessary to wrap the whole thing in parentheses too

#define square(x) ((x)*(x))

like this

ok so division got the precedence here

so it becomes 128, wow the questions are very tricky

that’s a nice example actually, and I think I should update my tutorial which I linked