Help! Classroom Problem: Two .cpp files, one .h file.

[naive tundra]

Hello I'm having trouble with this problem given to us.

We are given three files. One .cpp file WITH an int main(), one .cpp file WITHOUT an int main(), and a .h file (I'll name the two .cpp files .cpp(1) and .cpp(2) respectively).

The .h file contains a class it declares.

The .cpp(2) file contains the functions related to this class.

The .cpp(1) file contains the int main(), #include the .h file, and has hard coded input. It does not #include the .cpp(2) file so it fails to compile.

I #include-d the .cpp(2) file and it compiles successfully however there are two rules in this homework:

1. Keep all three files separately
2. Do not #include implementation files (which is what I assume .cpp(2) is)

I cannot post the full code for legal reasons but I can answer any clarifications on the code/program.

(this is also a terminal based program)

Thank you!

[silver plover]

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[novel cape]

you're supposed to also compile the second .cpp file

[naive tundra]

How do I do that?

[novel cape]

like g++ one.cpp two.cpp

specify both files when compiling

[naive tundra]

Sorry, I have not compiled and ran manually before, I've always been using the C/C++ Compile Run extension

after compiling, what command do I do to run the program?

[novel cape]

like code runner in visual studio code?

[naive tundra]

yep

[novel cape]

it just doesn't work when compiling multiple files

[naive tundra]

ahhhhh okok

Sorry, what's the command for running the compiled program?

[novel cape]

./program

[naive tundra]

Thank you!

One more question

if you don't mind

[novel cape]

;compile bash cat > a.cpp << EOF int foo(){ return 42; } EOF cat > a.hpp << EOF //should include some header guards in general int foo(); EOF cat > b.cpp << EOF #include"a.hpp" #include<iostream> int main(){ std::cout<<foo()<<'\n'; } EOF g++ -oT a.cpp b.cpp ./T

[plucky cedar]

Program Output

42

halalaluyafail3 | bash script | bash | wandbox.org

[novel cape]

for example

[novel cape]

sure

[naive tundra]

what's the difference between gcc and g++

my prog prof told us to use gcc when compiling

[novel cape]

g++ links the C++ standard library and other things necessary for compiling C++ code

[naive tundra]

ohhhhh okok thank you

[novel cape]

;compile bash cat > a.cpp << EOF int foo(){ return 42; } EOF cat > a.hpp << EOF //should include some header guards in general int foo(); EOF cat > b.cpp << EOF #include"a.hpp" #include<iostream> int main(){ std::cout<<foo()<<'\n'; } EOF gcc -oT a.cpp b.cpp

[plucky cedar]

Program Output

/usr/bin/ld: /tmp/ccObuGxa.o: in function ​`main':
b.cpp:(.text+0x12): undefined reference to ​`std::cout'
/usr/bin/ld: b.cpp:(.text+0x17): undefined reference to ​`std::ostream::operator<<(int)'
/usr/bin/ld: b.cpp:(.text+0x24): undefined reference t

halalaluyafail3 | bash script | bash | wandbox.org

[novel cape]

see the error here

[naive tundra]

yep I got something similar

thank you for all of your help!

[novel cape]

you can do the same manually by adding extra arguments to gcc as well if you have to

[naive tundra]

ahhh okok

I see I see

my prof recommend us to use CodeBlocks as our ide

but I'm already familiar with vsc

but thank you!

I'll marked this as solved

!solved

[silver plover]

Thank you and let us know if you have any more questions!

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[novel cape]

;compile bash cat > a.cpp << EOF int foo(){ return 42; } EOF cat > a.hpp << EOF //should include some header guards in general int foo(); EOF cat > b.cpp << EOF #include"a.hpp" #include<iostream> int main(){ std::cout<<foo()<<'\n'; } EOF gcc -oT a.cpp b.cpp -lstdc++ ./T

[plucky cedar]

Program Output

42

halalaluyafail3 | bash script | bash | wandbox.org

[novel cape]

here is an example of doing that

[naive tundra]

okok

[pseudo frost]

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