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c++ Programming Glossary: sumWhy is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array data data arraySize Test clock_t start clock long long sum 0 for unsigned i 0 i 100000 i Primary loop for unsigned c 0.. loop for unsigned c 0 c arraySize c if data c 128 sum data c double elapsedTime static_cast double clock start CLOCKS_PER_SEC.. CLOCKS_PER_SEC std cout elapsedTime std endl std cout sum sum std endl Without std sort data data arraySize the code runs..
Why isn't sizeof for a struct equal to the sum of sizeof of each member? http://stackoverflow.com/questions/119123/why-isnt-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member isn't sizeof for a struct equal to the sum of sizeof of each member Why does the 'sizeof' operator return..
What is the difference between a definition and a declaration? http://stackoverflow.com/questions/1410563/what-is-the-difference-between-a-definition-and-a-declaration S int a int b defines S S a and S b struct S declares S To sum it up The C standard considers struct x to be a declaration..
What is the equivalent of the C++ Pair<L,R> in Java? http://stackoverflow.com/questions/156275/what-is-the-equivalent-of-the-c-pairl-r-in-java example of a pair that carry its meaning in its name. To sum up in my opinion it is better to have a class Position x y a..
http://stackoverflow.com/questions/1761626/weighted-random-numbers random where items have individual weights 1 calculate the sum of all the weights 2 pick a random number that is 0 or greater.. a random number that is 0 or greater and is less than the sum of the weights 3 go through the items one at a time subtracting.. than that item's weight Pseudo code illustrating this int sum_of_weight 0 for int i 0 i num_choices i sum_of_weight choice_weight..
Best way to detect integer overflow in C/C++ http://stackoverflow.com/questions/199333/best-way-to-detect-integer-overflow-in-c-c multiplication any two operands will result in at most the sum of the bits of the operands. For example bool multiplication_is_safe..
What does 'unsigned temp:3' mean? [duplicate] http://stackoverflow.com/questions/2950029/what-does-unsigned-temp3-mean if you're careful. the size of the structure will be the sum of the sizes of the fields inside. In your case size of op is..
What are Aggregates and PODs and how/why are they special? http://stackoverflow.com/questions/4178175/what-are-aggregates-and-pods-and-how-why-are-they-special at all like int a 1 2 3 the size of the array n is assumed to be equal to m so int a 1 2 3 is equivalent to int a 3 1.. braces implies that the class is nothing more than the sum of its members. If a user defined constructor is present it.. copy POD objects with memcpy . The following example assumes T is a POD type #define N sizeof T char buf N T obj obj initialized..
When to use virtual destructors? http://stackoverflow.com/questions/461203/when-to-use-virtual-destructors one of the derived class resulting in resources leak. To sum up always make base classes' destructors virtual when they're..
Why should `new` be used as little as possible? http://stackoverflow.com/questions/6500313/why-should-new-be-used-as-little-as-possible storage as often as possible Basically the last paragraph sums it up. Using automatic storage as often as possible makes your.. is not immediately obvious. Basically it's better than the sum of its parts. The whole mechanism composes . It scales. If you..
How to deduce the type of the functor's return value? http://stackoverflow.com/questions/12005749/how-to-deduce-the-type-of-the-functors-return-value as in this example of the functor template typename T auto Sum T x T y decltype x y return x y Update The 1st example was oversimplified...
How can I measure CPU time and wall clock time on both Linux/Windows? http://stackoverflow.com/questions/17432502/how-can-i-measure-cpu-time-and-wall-clock-time-on-both-linux-windows cpu1 cpu0 endl Prevent Code Elimination cout endl cout Sum sum endl Output 12 threads Wall Time 15.7586 CPU Time 178.719..
how to sum a large number of float number? http://stackoverflow.com/questions/2148149/how-to-sum-a-large-number-of-float-number myvec.push_back 1.0f pvec myvec float mysum mysum parallelSum pvec cout the p sum is mysum endl clock_t finish clock cout.. not associative in other words your sequential algorithm Sum A ... A1 A2 A3 A4 ... A10000 May produce a different result.. produce a different result from the parallelised version Sum A ... A1 A2 A3 A4 ... A1000 ... A1001 A1002 A1003 A1004 .....
c++/cli pass (managed) delegate to unmanaged code http://stackoverflow.com/questions/2972452/c-cli-pass-managed-delegate-to-unmanaged-code #pragma managed push off typedef void UnmanagedSummer int arg void UnmanagedMethod int a int b UnmanagedSummer.. int arg void UnmanagedMethod int a int b UnmanagedSummer sum int result a b sum result #pragma managed pop ref class.. #pragma managed pop ref class Test delegate void ManagedSummer int arg public static void Run Test^ t gcnew Test ManagedSummer^..
Split an Integer into its digits c++ http://stackoverflow.com/questions/4207696/split-an-integer-into-its-digits-c 10 number number 10 cout digit sum sum digit cout endl Sum of the digits is sum endl system PAUSE return EXIT_SUCCESS Here.. 0 cout digitstack.top digitstack.pop cout endl Sum of the digits is sum endl system PAUSE return EXIT_SUCCESS Oh..
Generating m distinct random numbers in the range [0..n-1] http://stackoverflow.com/questions/6947612/generating-m-distinct-random-numbers-in-the-range-0-n-1 n calls is q^ n 1 p . Thus the mathematical expectation is Sum n q^ n 1 p n 1 INF . This sum is equal to 1 p proved by wolfram.. n n k calls of the rand function. Now let's sum it overall Sum n n k k 0 m 1 n T the number of rand calls in method 1. Here.. k k 0 m 1 n T the number of rand calls in method 1. Here T Sum 1 n k k 0 m 1 Case 2 Here rand is called inside random_shuffle..
Efficient way of storing Huffman tree http://stackoverflow.com/questions/759707/efficient-way-of-storing-huffman-tree Tree size 10 NUMBER_OF_CHARACTERS 1 Encoded size Sum for each char freq in table freq len PATH char The tree size.. D 2 occurances 3 bits 6 bits E 5 occurances 2 bits 10 bits Sum of encoded bytes is 12 3 12 6 10 43 bits Add that to the 49.. 001A1B001C1D01E1F 59 bits Data 000001100101110111 18 bits Sum 59 18 77 bits 10 bytes Since the original was 7 characters of..
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