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This is the correct way to do it.

/* main.m, Simple Calculator, Created by Great on 10/30/22. */


#import <Foundation/Foundation.h>


int enter_value(int);
int enter_operator(void);
int calculate(int, int, char);

Cheap trick to force someone else to do your stuff..



in <= '9' && in >= '0'
Remove this.
Keep it simple.

in that case,
all the files from the user's directory.

Mostly reading and writing..

From my observations, speed is reduced with large 8mb buffers, as compared to 256kb buffers..
Without a doubt, large buffers decrease speed significantly.

8.6. Obtaining Large Buffers

c++ - Is using a bigger buffer useful? - Software Engineering Stack Exchange


This guy describes the correct theoretical scenario,
which in itself is a paradox.

How can one carry a giant sand...

Usually bufsize is 1024 and sometimes 4096.
The point was about the chance of a larger buffer failing..

I am not sure, but a larger buffer will have quite an impact,
especially if you are short on RAM..

fwrite consume free memory continuously - C++ Forum

He could be right.

In fact, there is a possibility that write()
returns partial writes for larger buffers.

@hamster_nz
The possibility of fwrite() / write() failing increases the larger the buffer ??

IBM Documentation


IBM Documentation


off_t is 32 / 64 bit integer,
and with a large file, it will overflow.

Author may be misinformed..

c++ - How does _stat() under Windows exactly work - Stack Overflow

Also one has to take into account a performance issue,
since fread / read requires a buffer.

Stat is posix.

Even if fread / read can determine file size,
is it a good approach ?

How do you know what I did not study,
did you examine my lab papers back then ??

If you do not understand a particular context,
just don't add your half-formed opinion..

Can this be considered a design flaw,
or a regular exception ??


int a = -2147483648;
int b = ~a;

b = 1 + b;
printf("%d\n", a); /* Prints -2147483648. */
printf("%d\n", b); /* Also...

FIO19-C. Do not use fseek() and ftell() to compute the size of a regular file - SEI CERT C Coding Standard - Confluence


Is a buffered fread / read to obtain size considered a bad approach,...

There's also a possibility that write() fails,
and errno is 0.

Absolutely, it is poor code, it goes against the documentation,
write() returns a value for a reason.

The idea was to use write() without checking it's return value,
and relying on errno...

Is there a possibility that write() is successful and errno may still be set,
errno is a global..

Why are you going through such pain,
Given the fact that people will reject your work.
Even folks like us, who go through the same thing, don't care.

Unless there is serious financial...

The conventional way to use write(),
is to verify that the return value matches the number of bytes.

But what could possibly go wrong,
if the return value is ignored and errno is used..

errno...