One fix

[cold fulcrum]

I have a problem: Why is the result52 file not created after compilation? What should I do?

[hasty heart]

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[urban zenith]

there propably is a compilation error

check the compiler output

[pure cradle]

Why is the result52 file not created after compilation?
You also need to run your program btw

[cold fulcrum]

It goes with out mistakes

[urban zenith]

if it doesn't create the executable it propably doesn't

or the executable is put somewhere you didn't expect it

[cold fulcrum]

Nah

[urban zenith]

how are you trying to compile it?

[radiant sedge]

Try gcc arr11.c -static

[cold fulcrum]

Nothing

I originally had one function, it created a file, then I split it into two and this stuff happened

[radiant sedge]

Try printing something a the beginning of main() to make sure it runs

[urban zenith]

this code won't compile

just saying

[cold fulcrum]

Gives error

[urban zenith]

[cold fulcrum]

like if I write dhchfudxhbrhdmain() then an error

[urban zenith]

[glacial urchin]

You never call find_first_max_index() inside main().