there is no definition of foo in your use.cpp.

Do you really know how to define a variable in C++?

here, line 1, declaration of int foo.

Do you really know how to define a variable in C++?

its defined in the header already?

here, line 5, usage of undefined variable foo.

my.h has that

here, line 7, usage of undefined variable foo.

You need declared variable foo

but no definition.

and create function print_foo(0

$ cat linkee.h #include <iostream> extern int bar; void print(int i); void print_bar(); $ cat linkee.cc #include "linkee.h" int bar = 0; void print(int i) { std::cout << i << std::endl; } void print_bar() { std::cout << bar << std::endl; } $ cat linker.cc #include "linkee.h" int main() { bar = 24; print_bar(); print(42); return 0; } $ g++ linker.cc linkee.cc $ ./a.out 24 42

my.h has that

You declared foo is global varibale

Guys i need small help

I print # now many time loop go inside want increase # size??

How to perform this

Help me

my.h has that

extern int foo declares foo, but does not define it. have you got this now?

extern int foo declares foo, but does not define it. have you got this now?

eh im checking it :c

eh im checking it :c

+u

I need help

extern int i; // declaration, not definition int i; // declaration and definition, but not initialized int i = 0; // declaration and definition, initialized with 0 @sid_artix

extern int foo declares foo, but does not define it. have you got this now?

yeah i get it now

yeah i get it now

glad to know

Did u use the hash function from the standard STL library or of some other package such as boost asio

From standard STL

@sid_artix

I need some help

does this mean i should define the value of foo in my.cpp as well?

I need some help

what is it

I want increase size of # so how to increase size

When loop go inside first #..then 2 times in loop ##

does this mean i should define the value of foo in my.cpp as well?

yes, your source file should define foo as well

5 times in loop #####

When loop go inside first #..then 2 times in loop ##

so you want to print # twice? == 2 times loop?

so you want to print # twice? == 2 times loop?

Yes see there

I want to print many time # when loop go inside

for(int i = 0 ; i < 5 ; i++){ cout << "#"; }

In c

for(int i = 0 ; i < 5 ; i++){ cout << "#"; }

Not like that

idk C -.—

Ok

I want to learn c++

printf("#")

Source of learning c++

printf("#")

No bro that's like small game so i can't do that

printf("#")

I have seen people doing printf("%c", '#');

I have seen people doing printf("%c", '#');

...

No bro that's like small game so i can't do that

In ASCII style? Or just a normal graphical game? In 3D?

I have seen people doing printf("%c", '#');

No bro

which language has a better scope. c++,c or python

In ASCII style? Or just a normal graphical game? In 3D?

Just normal snake game

Just normal snake game

Ok, that's even possible without (n)curses

versatility

Ok, that's even possible without (n)curses

How to do

Just normal snake game

learning both of them makes your scope larger.

My 95% work done...bow only size increases step

and c

which is more machine friendly

How to do

Well you need a drawing function and a movement function. The movement function defines the beginning and the end position of the snake while the drawing function draws it to the terminal.

Oh and of course the control function which can modify the behavior of the movement function.

Any trainer for c 11

Any trainer for c 11

What do you mean by "trainer"? A human who gives direction or a tutorial with tasks (like hackerrank)

someone knows how can I get last 3 char of string in c programming?

someone knows how can I get last 3 char of string in c programming?

"Get"? From stdin?

"Get"? From stdin?

User will type <file_format> and <file_name> on commande line

User will type <file_format> and <file_name> on commande line

As argv?

As argv?

yes

I have done every thing with argv

but I don't know how to get last 3 char to compare with <file_format>

User will type <file_format> and <file_name> on commande line

file_format would be argv[1] and file_name would be argv[2] ig

file_format would be argv[1] and file_name would be argv[2] ig

yes

but I don't know how to get last 3 char to compare with <file_format>

Ahhhh, you mean strcmp()?

But from where you want to "get"? Do you want to check if the file name ends with the file format given?

For example: /.Myprog -f <file_format> <file_name> /.Myprog -f pgm hello.pgm

For example: /.Myprog -f <file_format> <file_name> /.Myprog -f pgm hello.pgm

I have to compare pgm of format and with pgm of file_name

For example: /.Myprog -f <file_format> <file_name> /.Myprog -f pgm hello.pgm

strchr to find the position of the dot

like just look at cppreference

I have to compare pgm of format and with pgm of file_name

Ahhh, so you want to cut the .pgm off hello.pgm so you get just hello?

Find the position of the .pgm and set a null-terminator

like just look at cppreference

https://en.cppreference.com/w/cpp/string/byte heck i just found strrchr() that's a better match for what you want to do

Ahhh, so you want to cut the .pgm off hello.pgm so you get just hello?

non, if user has put the right format