The Paramagnetic Croissant

The Paramagnetic Croissant has asked 4 questions and find answers to 31 problems.

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Xcode is not the same thing as Objective-C, clang, the iOS SDK or the Cocoa Touch APIs.
Casting the return value of standard allocators is harmful.
So is premature optimization.
There exists no language called "C/C++".
Whitespace exists for a reason. So do formatting and code quality tools, compiler warnings and debuggers. Use them.
Regular expressions are not the answer to life, universe and everything.
while(!feof(f)) is always wrong

The Paramagnetic Croissant questions

Specializing std::hash for private member class
Is this use of reinterpret_cast on differently-qualified struct members safe?
Is the strict aliasing rule really a "two-way street"?
How does Rust achieve compile-time-only pointer safety?

The Paramagnetic Croissant answers

What is the maximum errno value?
How to scanf only integer?
How does fgets() keep track of what line it's on?
dereference variable address through null structure pointer, no segmentation fault
'Char' is promoted to 'int' when passed through in C
Rounding up to powers of 2 (with preprocessor constants)
super init constructor in Swift
How to jump out of the outer loop if inner' for 'loop is executed in lua
Obtain a pointer to a C char array in Swift
Why does "(seed * 9301 + 49297) % 233280 / 233280.0" generate a random number?