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C++ Articles
Page 573 of 597
C++ Program to Solve a Matching Problem for a Given Specific Case
This is a C++ Program to solve a matching problem for a Given Specific Case. Here, N men and N women are given, each person has ranked all members of the opposite gender in order of preference, marry the men and women together such that there are no two people of opposite gender who would both rather have each other than their current partners. All the marriages are “stable”, if there are no such people exists.AlgorithmsBegin function WomenPrefersMenOverMen1(): A) Check if women prefer men over her current engagement men1 B) If men1 comes before men in list ...
Read MoreWhat is the difference between size_t and int in C++?
Here we will see what are the differences between size_t and int in C++. If we consider the standard, both are integers of size 16 bits.On a typical 64-bit system, the size_t will be 64-bit, but unsigned int will be 32 bit. So we cannot use them interchangeably.One standard recommendation is that the size_t be at most as big as an unsigned long. So you may think that we can use unsigned long in the place of size_t, but unsigned long on 64-bit system, if the OS ins Windows, will be of 32-bits, but size_t will be of 64-bits.
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 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 MoreCatch block and type conversion in C++
In this section, we will see how to use the catch block for exception handling and the type conversion in C++.At first, let us see a code, and we will see what will be the output, and how they are generating.Example#include using namespace std; int main() { try{ throw 'a'; } catch(int a) { cout
Read MoreRint(), rintf(), rintl() in C++
Here we will see three functions. These functions are Rint(), rintf() and the rintl(). These functions are used to convert floating point values into rounded format.The rint() FunctionThis function is used for rounding floating point value to integer. The syntax is like below. If the result is outside of return type, the domain error may occur. When the argument is 0 or infinity, then it will return unmodifiedfloat rint(float argument) double rint(double argument) long double rint(long double argument)Example#include #include using namespace std; main() { double a, b, x, y; x = 53.26; y = 53.86; ...
Read MoreImplementation of a Falling Matrix in C++
We have seen falling matrix scene in different films etc. Here we will see how to write a C++ program to do like that.To solve this problem, we have to care about these steps.Define width of the matrixTwo successive characters may or may not have same amount of gap between themA certain amount of delay between printing each line to visualize the falling effect.Example#include #include #include #include #include #include const int wd = 70; //set the width of the matrix window const int flipsPerLine =5; //five flips for the boolean array 'alternate' const int sleepTime = 50; //it will take ...
Read Moreregex_error in C++
The regex library has different methods and features related to regular expressions. Here we will see some regex_errors. These are also present at regex library. During executing some regular expressions, we get some errors. That errors are mentioned here.FlagsErrorserror_collateIn the Regex, the names having invalid collation.error_ctypeIn the Regex, there is an invalid character class name.error_stackNot enough memory to determine regex can be matched or not.error_spaceConvert into Finite State Machine, when memory is insufficienterror_badrepeatThe string has repeat specifier ( *?+{) that was not preceded by a valid regular expression.error_complexityThe complexity of an attempted match against a regex exceeded a pre-set levelerror_rangeContaining ...
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 ...
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