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Posts by Lundin
Warnings most often mean "here is a bug which will likely cause your program to crash or misbehave". They do not mean "here's something that you can optionally fix when you can spare the time". See...
The size of the "primitive data types" int, float etc is not defined by the standard. In practice, int is either 16 or 32 bits on all known systems. Because of the unspecified size leading to poor...
https://software.codidact.com/posts/277536/278390?sort=score At the point when I'm posting, the answer by Lundin has +14 score and the answer by dmckee has +11 score. Neither has any down votes. ...
C programs are executed from top to bottom. You can't declare a VLA with an uninitialized variable as its size parameter. For the same reason at you can't do this: int x; printf("%d\n",x); scanf...
This is meant as a FAQ Q&A regarding variable-length arrays (VLA). The two bugs described below are surprisingly common. I'm trying to use the variable-length arrays feature of C99 (and newe...
Does Inteheritance actually meant return and Polymorphism meant to print out values? This doesn't make the slightest sense... Probably you should forget all you've heard - don't "watch tutoria...
Bugs: int **range = 0; should be int *range; and then call the function like ft_ultimate_range(&range, min, max);. That's the whole reason the parameter is pointer-to-pointer, so that you c...
First of all, I realize that this is mostly a library you've implemented while learning programming, for the sake of learning, which is great. So I would rather not put a "wet blanket" over your at...
My recommended beginner setup for gcc-like compilers is: -std=c11 -pedantic-errors -Wall -Wextra -Werror Here is an explanation of what these options do: -std=c11. gcc & friends are by d...
When reading questions about C programming from beginners, I very often see them describing peculiar run-time errors and crashes, segmentation faults and similar. They have spent a lot of time chas...
The warnings just say that you can't pass a string literal with type char[] to a function taking a struct Book* parameter. The function should be declared as: void init_Book_types (const char* tit...
I went ahead and made a proposal on Power User that a separate category for office suites should be made. I suggest that we wait and see where that proposal lands. If a category for these question...
Regarding "snark" - it is very hard and subjective to define. Our overall code of conduct says "be nice", but where do you draw the line. On SO, general gruff attitude tends to be treated very diff...
Writing to the file on the HD is your massive bottleneck no matter how many threads you throw around. The limit is the physical memory access speed, not processing power. And since it is such a bot...
Summary (TL;DR) Using strcpy directly on non-sanitized user input is bad, otherwise it's fine. strncpy is a dangerous function that should be avoided. Its presence in your source is a muc...
I heard rumours that the strcpy function is dangerous and shouldn't be used. Supposedly it can be exploited to create buffer overflows somehow. And indeed when I compile my C code in the admittedl...
I just noticed that I'm not getting code formatting in the preview window when I write an answer or make an edit. This is very useful to have. Not sure if it's a bug so I'm posting this as a featu...
You can use -Wconversion but you should be aware that it is very prone to false positives. It's a good flag to turn on during code review etc to shake out a few minor issues, but it's not a flag yo...
There are many things we label as bad when programming, for various reasons. Repeating code is slightly bad. But writing function like-macros is extremely bad. You should not try to replace someth...
You are right, the on-topic page is confusing - trouble-shooting and general programming questions should obviously be on-topic! Perhaps we considered it so obvious that it fell between the lines ...
Yes, it is in practice always a character type and you can safely assume as much, both in terms of (g)lvalue access and in terms of strict pointer aliasing. If not, the compiler would soon render i...
This goes back to the various CPU architecture "wars" in the 1970s-1980s between the competitors Intel and Motorola (for example Intel 8086 vs Motorola 68000). For various reasons, CPUs from these ...
I was fooling around with the following C code on my trusty old x86 PC: #include <stdint.h> #include <stdio.h> int main (void) { uint32_t u32 = 0xAABBCCDD; uint8_t* ptr = (u...
The sole purpose of the do { } while(0) is to write macros that accommodates to all manner of diverse coding styles. It is quite common not to use braces after if statements, so this is a common co...
Background I can see the need to use { } when implementing a function-like macro such as this one: #define HCF(code) fprintf(stderr, "halt and catch fire"); exit(code); Because if we use the f...
