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Using scanf() in C++ programs is faster than using cin?
...and XOR all of the numbers.
iostream version:
#include <iostream>
int main(int argc, char **argv) {
int parity = 0;
int x;
while (std::cin >> x)
parity ^= x;
std::cout << parity << std::endl;
return 0;
}
scanf version:
#include <stdio.h>
int main...
What does the comma operator , do?
... comma operation will always be the value of the last expression. At no point will i have the values 5, 4, 3, 2 or 1. It is simply 0. It's practically useless unless the expressions have side effects.
– Jeff Mercado
Nov 13 '10 at 7:06
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Declaring a custom android UI element using XML
...get this
a.recycle();
}
R.styleable.MyCustomView is an autogenerated int[] resource where each element is the ID of an attribute. Attributes are generated for each property in the XML by appending the attribute name to the element name. For example, R.styleable.MyCustomView_android_text contai...
What does value & 0xff do in Java?
...is is necessary is that byte is a signed type in Java. If you just wrote:
int result = value;
then result would end up with the value ff ff ff fe instead of 00 00 00 fe. A further subtlety is that the & is defined to operate only on int values1, so what happens is:
value is promoted to an i...
Where do I find the definition of size_t?
...but I don't know where it comes from, nor what is its purpose. Why not use int or unsigned int? (What about other "similar" types? Void_t, etc).
...
Which is faster : if (bool) or if(int)?
The above topic made me do some experiments with bool and int in if condition. So just out of curiosity I wrote this program:
...
What is the difference between memoization and dynamic programming?
...then computed.
If you use memoization to solve the problem you do it by maintaining a map of already solved sub problems. You do it "top down" in the sense that you solve the "top" problem first (which typically recurses down to solve the sub-problems).
A good slide from here (link is now dead, sl...
range over interface{} which stores a slice
Given the scenario where you have a function which accepts t interface{} . If it is determined that the t is a slice, how do I range over that slice?
...
delete vs delete[] operators in C++
...tructors for an array of objects created with new [].
Using delete on a pointer returned by new [] or delete [] on a pointer returned by new results in undefined behavior.
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Indexes of all occurrences of character in a string
The following code will print 2
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