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Articles by Samual Sam
Page 129 of 151
C++ Program to Generate All Pairs of Subsets Whose Union Make the Set
This is a C++ program to generate all pairs of subsets, whose union make the Set.AlgorithmsBegin function UnionSet(): Arguments: a[] = an array. n = number of elements. Body of the function: 1) Generate binary code from 0 to 2^(n-1)-1 for all 2^(n-1) pairs. 2) Print the array element which has 0 or 1 in corresponding indexes in code string for each code. 3) Print them in a different set, which on the union of both sets gives the super set. EndExample#include #include #include using namespace std; void display(char code[], int a[], int n) //display the pairs { int i; cout
Read MoreGenerate random numbers using C++11 random library
In C++11, we can get the random library to generate random numbers. Here we have used random_device once to seed the random number generator object called mt. This random_device is slower than the mt19937, but we do not need to seed it. It requests for random data to the operating system.Example #include #include using namespace std; int main() { random_device rd; mt19937 mt(rd()); uniform_real_distribution dist(20.0, 22.0); //range is 20 to 22 for (int i=0; i> dist(mt) >> endl; }Output21.5311 21.7195 21.0961 21.9679 21.197 21.2989 20.6333 20.441 20.7124 20.2654 21.1877 20.4824 20.0575 20.9432 21.222 21.162 21.1029 20.2253 21.5669 20.3357
Read MoreHow does generic lambda work in C++14?
In C++11, the lambda was introduced. Lambdas are basically a part of, that can be nested inside other function call statements. By combining lambda expressions with the auto keyword, they can be used later.In C++14, these lambda expressions are improved. Here we can get the generalized or generic lambda. For example, if we want to create a lambda, that can add integers, add numbers, also concatenate strings, then we have to use this generalized lambda.Syntax of the lambda expression is looking like this −[](auto x, auto y) { return x + y; }Let us see one example to get the ...
Read MoreHow to initialize a const field in constructor?
Here we will see how to initialize the const type variable using constructor?To initialize the const value using constructor, we have to use the initialize list. This initializer list is used to initialize the data member of a class. The list of members, that will be initialized, will be present after the constructor after colon. members will be separated using comma.Example#include using namespace std; class MyClass { private: const int x; public: MyClass(int a) : x(a) { //constructor } void show_x() { ...
Read MoreHow to launch a program using C++ program?
Here we will see how to start some third-party application like notepad or anything using C++ program. This program is very simple, we can use command prompt command to do this task.We will pass the application name inside the system() function. This will open it accordingly.Example#include using namespace std; int main() { cout >> "Opening Nodepad.exe" >> endl; system("notepad.exe"); }Output
Read MoreWhat does buffer flush means in C++ ?
The buffer flush is used to transfer of computer data from one temporary storage area to computers permanent memory. If we change anything in some file, the changes we see on the screen are stored temporarily in a buffer.In C++, we can explicitly have flushed to force the buffer to be written. If we use std::endl, it adds one new line character, and also flush it. If this is not used, we can explicitly use flush. In the following program at first no flush is used. Here we are trying to print the numbers, and wait for one seconds. For ...
Read Moretransform() in C++
The transform function is present in the C++ STL. To use it, we have to include the algorithm header file. This is used to perform an operation on all elements. For an example if we want to perform square of each element of an array, and store it into other, then we can use the transform() function.The transform function works in two modes. These modes are −Unary operation modeBinary operation modeUnary Operation ModeIn this mode the function takes only one operator (or function) and convert into output.Example#include #include using namespace std; int square(int x) { //define square ...
Read MoreAdvanced C++ with boost library
C++ boost libraries are widely useful library. This is used for different sections. It has large domain of applications. For example, using boost, we can use large number like 264 in C++.Here we will see some examples of boost library. We can use big integer datatype. We can use different datatypes like int128_t, int256_t, int1024_t etc. By using this we can get precision up to 1024 easily.At first we are multiplying two huge number using boost library.Example#include #include using namespace boost::multiprecision; using namespace std; int128_t large_product(long long n1, long long n2) { int128_t ans = (int128_t) n1 * ...
Read MoreWhat happen when we exceed valid range of built-in data types in C++?
Here we will see what will be the results, if we exceed the range of built-in datatypes in C++. So let us see some examples.First one is the character type data. Here we are using a loop from 0 to 300, so it should print from 0 to 300, then stop. But it will generate one infinite loop. The character type data holds from -128 to 127. So after increasing from 127, it will be -128 again. So it will never reach at the point 300.Example#include using namespace std; int main() { for (char x = 0; x ...
Read MoreWhen are Constructors Called in C++?
Here we will see, when constructors are called. Here constructors are of different types. Global, local, static local, dynamic.For the global object, the constructors are called before entering into the main function.Example#include using namespace std; class MyClass { public: MyClass() { cout
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