— If i input an int it works fine,
But if type in lets say a letter , its called the not_an_option() function which is not even lexically even in that function
— That function is only called in the initial question function
— You write so much
— Do you understand ?
— Did you check all scanf calls?
— What you mean ?
— Check if scanf succeeded
— Ok give me 2 mins
— Also consider compiling with -fsanitize=address or -fsanitize=undefined and run it again with same input
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— I think that your main problem is that you consider that programming is just writing code