Struggling with an assignment

[merry portal]

I am completely new to coding and I have an assignemt I am lost on. I have been assigned to fix incorrect code and don't know how to.

[clear oriole]

When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question use !howto ask.

[river thunder]

!f

[clear oriole]

#include <stdio.h>
#define PI 3.14159
int main(void) {
  int radius;
  printf(“Enter radius :”);
  scanf(“% d”, &radius);
  printf(“volume is : % d \n\n“, 4 * radius * radius * radius / 3);
  return 0;
}

ArtemiZk

Formatted by Spectre

[merry portal]

thanks

[river thunder]

what do you have problems with

there are some obvious errors

[muted zenith]

that not "

[river thunder]

when you have an assignment they should have tought you something before?

[muted zenith]

again “ is not "

you need to use "

[river thunder]

i am not OP

[low mason]

;compile

[quaint crag]

Compiler Output

<source>:5:10: error: extended character “ is not valid in an identifier
    5 |   printf(“Enter radius :”);
      |          ^
<source>:5:25: error: extended character ” is not valid in an identifier
    5 |   printf(“Enter radius :”);
      |                         ^
<source>:6:9: error: extended character “ is not valid in an identifier
    6 |   scanf(“% d”, &radius);
      |         ^
<source>:6:12: error: extended character ” is not valid in an identifier
    6 |   scanf(“% d”, &radius);
      |            ^
<source>:7:10: error: extended character “ is not valid in an identifier
    7 |   printf(“volume is : % d \n\n“, 4 * radius * radius * radius / 3);
      |          ^
<source>:7:27: error: stray '\' in program
    7 |   printf(“volume is : % d \n\n“, 4 * radius * radius * radius / 3);
      |                           ^
<source>:7:29: error: stray '\' in program
    7 |   printf(“volume is : % d \n\n“, 4 * radius * radius * radius / 3);
      |                           

alplusplus | c++ | x86-64 gcc 15.1 | godbolt.org

[muted zenith]

like i said

[river thunder]

i think that is one of the errors he is supposed to fix

[muted zenith]

that really really obvious

[river thunder]

yes

[clear oriole]

@merry portal Has your question been resolved? If so, type !solved :)

[merry portal]

there was another error when i did that

[muted zenith]

show code again

[merry portal]

!p

idk how to use the bot :/

one sec

[muted zenith]

!f

[clear oriole]

#include <stdio.h>
#define PI 3.14159
int main(void) {
  int radius;
  printf("Enter radius:");
  scanf("%d", &radius);
  printf("volume is : %d \n\n", 4 * radius * radius * radius / 3);
  return 0;
}

ArtemiZk

Formatted by Ekim, Herald of the Ideas

[merry portal]

ok ok thanks

[muted zenith]

which error

[muted zenith]

!compile

bruh i hate it

;compile

2

#include <stdio.h>
#define PI 3.14159
int main(void) {
  int radius;
  printf("Enter radius:");
  scanf("%d", &radius);
  printf("volume is : %d \n\n", 4 * radius * radius * radius / 3);
  return 0;
}

[quaint crag]

Program Output

Enter radius:volume is : 10

ekim0000 | 33ms | c | x86-64 gcc 15.2 | godbolt.org

[merry portal]

here wait

./main.cpp:7:2: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result]
7 | scanf("%d", &radius);
| ^~~~~ ~~~~~~~~~~~~~
1 error generated.
make: *** [Makefile:10: main] Error 1

[merry portal]

!f

[clear oriole]

Nothing to format

[merry portal]

cool

[merry portal]

uhm yea thats the error im getting

[muted zenith]

you can use std::ignore

for example

  std::ignore = scanf("%d", &radius);

[merry portal]

okay

thank you

[low mason]

idk that exists

lol😭

[muted zenith]

std::ignore moment

[merry portal]

?

[muted zenith]

but actually c++26 will just use

auto _ = scanf("%d", &radius);

@merry portal do not use this specificly, use above one

[muted zenith]

so that work?

[muted zenith]

https://www.youtube.com/watch?v=iUcS0LCj2Ko&t=12s btw

[merry portal]

idk where to put it

[muted zenith]

ok, read error word by word with understanding

where error ocured?

[merry portal]

the uhm

[merry portal]

wait how do i format the code like this?

[muted zenith]

!code

[clear oriole]

How to Format Code on Discord

Markup

```cpp
int main() {}
```

Result

int main() {}

Note: Back-tick (`) not quotes (')

[merry portal]

this part

 scanf("%d", &radius);

[muted zenith]

yup

but to be clear, can you show your build flags

[merry portal]

my what?

im sorry, i actually just dont know how to refer to like anything

[muted zenith]

ok, how you run your code, which ide do you use?

[merry portal]

like

the platform or whatnot i am writing and running the code in?

[muted zenith]

ye

!google ide

[clear oriole]

Google

ide

[merry portal]

replit

ive heard its bad (i can kinda tell) but its like very very short term

[muted zenith]

why you use it?

and anyway, can you show what you have on the folder structure?

[merry portal]

its in my browser idk i couldnt figure out anything else with the next to zero research i did

the course provided one but it was broken or something

[merry portal]

that's important?

[muted zenith]

yes, to show where you specify flags

[muted zenith]

do you on windows?

if no then clion, if yes then clion or Visual studio

[merry portal]

okay

[merry portal]

this?

[muted zenith]

ok, open terminal

one time i installed doom emacs on replit

so that trivial anyway

[merry portal]

i dont see it

[muted zenith]

shell

tap to + and write shell

and that also called terminal on this thingy

[merry portal]

okay

done

[muted zenith]

the do ls -a

ls -a

and show output

[muted zenith]

tbf just install clion or vs

[muted zenith]

btw you not need #define PI anyway

there std::numbers::pi_v

[wraith blaze]

What if scanf returns 0 or EOF? Does std::ignore take care of that?

[muted zenith]

think about it, what is EOF?

[wraith blaze]

End of file or Buffer Error.

And still, what about 0. What if there is no readable input?

[muted zenith]

i mean, what it represented with

[muted zenith]

ignore ignoring

again

but also problem with specificly radius

[wraith blaze]

I dunno whether C and C++ are different there. In C it would be system dependant, but most of the time EOF = -1

[muted zenith]

if you not read radius then it not good

[muted zenith]

yup

[wraith blaze]

So std::ignore takes care of these cases?

[muted zenith]

std::ignore , ignore assigment

litteraly

[wraith blaze]

Okay, cool, than it is unsafe, or not?

[muted zenith]

it safe

[muted zenith]

just look this

[wraith blaze]

Okay, will check it out, thx^^

[south pumice]

#include <stdio.h>
#define PI 3.14159
int main(void) {
int radius;
printf("Enter radius:");
scanf("%d", &radius);
printf("volume is : %d \n\n", 4 * radius * radius * radius / 3);
return 0;
}

!compile

[muted zenith]