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How to find all combinations of coins when given some dollar value
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Here's some absolutely straightforward C++ code to solve the problem which did ask for all the combinations to be shown.
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
if (argc != 2)
{
printf("usage: change ...
How to detect total available/free disk space on the iPhone/iPad device?
...using NSUInteger instead of stuff like uint64_t ? We're writing Obj-C, not C++ or C. NSUInteger will give you an unsigned 64 bit integer now, but if things happen to change I imagine that Apple will update that Macro (let's say 128 bits at some point, becomes real)
– Goles
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Determine the line of code that causes a segmentation fault?
...ber of input files with (16 major steps; each one done by a different C or C++ binary). One later step will trigger segmentation fault only randomly because of multi-threading. It is hard to debug. This option triggered the debug information output at least it gave me a start point for code revie...
arrow operator (->) in function heading
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In C++11, there are two syntaxes for function declaration:
return-type identifier ( argument-declarations... )
and
auto identifier ( argument-declarations... ) -> return_type
They are equivalent. Now when ...
Parcelable where/when is describeContents() used?
...le inheritance by rules defined in human readable form? :-)
It seems like C++ programmer designed Parceable and at some point he realized: Oh, damn, there is no multiple inheritance in Java... :-)
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Way to go from recursion to iteration
...variable a local one, and iterate instead of recurse. Here's an example in C++ (C were it not for the use of a default argument):
// tail-recursive
int factorial (int n, int acc = 1)
{
if (n == 1)
return acc;
else
return factorial(n - 1, acc * n);
}
// iterative
int factorial (int n)
{...
Are static fields inherited?
...is being called automatically when SomeDerivedClass() is called, this is a C++ rule. That's why the total is incremented once per each SomeClass object, and then twice for SomeDerivedClass object. 2x1+2=4
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Officially, what is typename for?
...pression is not allowed by the grammar for a member declaration. As such, C++20 dispenses with the need for this typename (though not all of them!).
– Davis Herring
May 9 '19 at 3:52
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What does iterator->second mean?
In C++, what is the type of a std::map<>::iterator ?
2 Answers
2
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Typedef function pointer?
...ifficulty lies in the pointer to functions syntax and readability in C and C++, and the typedef can improve the readability of such declarations. However, the syntax is appropriate, since functions - unlike other simpler types - may have a return value and parameters, thus the sometimes lengthy and ...