Should return 0;.
this post was submitted on 11 Feb 2025
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Not needed, main in C++ implicitly returns 0 if there is no return
Should ≠ Needs to
You can do it, and it will work, but it's unclean and not best-practice. I wouldn't be surprised if it's undefined behaviour.
Just to clarify. It is defined behavior - there's plenty of undefined behavior in C but that ain't one of them.
Interesting feature, I had no idea. I just verified this with gcc and indeed the return register is always set to 0 before returning unless otherwise specified.
spoiler
int main(void)
{
int foo = 10;
}
produces:
push %rbp
mov %rsp,%rbp
movl $0xa,-0x4(%rbp) # Move 10 to stack variable
mov $0x0,%eax # Return 0
pop %rbp
ret
int main(void)
{
int foo = 10;
return foo;
}
produces:
push %rbp
mov %rsp,%rbp
movl $0xa,-0x4(%rbp) # Move 10 to stack variable
mov -0x4(%rbp),%eax # Return foo
pop %rbp
ret
>What is C++? A miserable huge pile of "should"s
Love me some Castlevania++
Still love it tho. You can make it whatever you want!
should have a space after „>” and two new lines after „?”.
I guess markdown is miserable as well.
Hey now, markdown serves it's purpose. It's not great, but as a web dev, I don't want people expecting full WYSIWYG editors in every website cause fuck that!
not being able to master markdown might hint at why the commenter is struggling with C++
It likely does, at some point within the ellipsis.
Didn't you know that C++ programmers are better than compilers at checking code for safety though? And if they aren't, it's a skill issue.
/s
It's all worth it for that sweet sweet 50ms speedup!/s
And sensible compile times.
I'm trying to write a game in Bevy but my laptop's Intel 7400 taking almost a minute to compile even small changes is really killing me.
I've looked up rustc compile times on different CPUs and am seriously considering getting a new laptop with a Snapdragon X Elite or something in that vein for this.