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Page 1418 of 2109
Copy set bits in a range in C++
In this tutorial, we will be discussing a program to copy set bits of one number to another in the given range.For this we will be provided with two integers. Our task is to see the bits in the first number and set those bits in the second number as well if they are in the given range. Finally returning the digit produced.Example#include using namespace std; //copying set bits from y to x void copySetBits(unsigned &x, unsigned y, unsigned l, unsigned r){ //l and r should be between 1 and 32 if (l < 1 || r ...
Read MoreConvex Hull Monotone chain algorithm in C++
In this tutorial, we will be discussing a program to find the convex hull of a given set of points.Convex hull is the smallest polygon convex figure containing all the given points either on the boundary on inside the figure.Example#include #define llu long long int using namespace std; //structure for the given point struct Point { llu x, y; bool operator= t && calc_crossproduct(ans[k - 2], ans[k - 1], A[i - 1])
Read MoreCoordinates of rectangle with given points lie inside in C++
In this tutorial, we will be discussing a program to find the coordinates of rectanglewith given points lying inside.For this we will be provided with some coordinate points. Our task is to find the smallest rectangle such that all the points lie inside it and it should have its sides parallel to the coordinate axis.Example#include using namespace std; //calculating the coordinates of smallest rectangle void print_rectangle(int X[], int Y[], int n){ //finding minimum and maximum points int Xmax = *max_element(X, X + n); int Xmin = *min_element(X, X + n); int Ymax = *max_element(Y, Y ...
Read MoreConverting seconds into days, hours, minutes and seconds in C++
In this tutorial, we will be discussing a program to convert seconds into days, hours, minutes and seconds.For this we will be provided with a random number of seconds. Our task is to convert it into proper number of days, hours, minutes and seconds respectively.Example#include using namespace std; //converting into proper format void convert_decimal(int n) { int day = n / (24 * 3600); n = n % (24 * 3600); int hour = n / 3600; n %= 3600; int minutes = n / 60 ; n %= 60; int seconds = n; cout
Read MoreConvex Hull using Divide and Conquer Algorithm in C++
In this tutorial, we will be discussing a program to find the convex hull of a given set of points.Convex hull is the smallest polygon convex figure containing all the given points either on the boundary on inside the figure.In this program, we will use brute force to divide the given points into smaller segments and then finally merging the ones that follow on to construct the convex hull.Example#include using namespace std; //storing the center point of polygon pair mid; //calculating the quadrant of //a particular point int quad(pair p){ if (p.first >= 0 && p.second >= 0) ...
Read MoreConverting Roman Numerals to Decimal lying between 1 to 3999 in C++
In this tutorial, we will be discussing a program to converting roman numerals to decimal lying between 1 to 3999.For this we will be provided with a random roman numeral. Our task is to convert the given roman numeral into its decimal equivalent.Example#include using namespace std; //calculating the decimal value int value(char r){ if (r == 'I') return 1; if (r == 'V') return 5; if (r == 'X') return 10; if (r == 'L') return 50; if (r == 'C') return 100; if (r == 'D') return ...
Read MoreConvert to Strictly increasing integer array with minimum changes in C++
In this tutorial, we will be discussing a program to convert to strictly increasing integer array with minimum changes.For this we will be provided with an array. Our task is to change the elements of the array to be in strictly increasing order by minimum number of changes in the elements.Example#include using namespace std; //calculating number of changes required int remove_min(int arr[], int n){ int LIS[n], len = 0; for (int i = 0; i < n; i++) LIS[i] = 1; for (int i = 1; i < n; i++) { for (int j = 0; j < i; j++) { if (arr[i] > arr[j] && (i-j)
Read MoreConvert to number with digits as 3 and 8 only in C++
In this tutorial, we will be discussing a program to convert a number to have digits as 3 and 8 only.For this we will be provided with a random number. Our task is to convert its digits to be only 3 and 8 by either adding/subtracting 1 from the number or converting digits of the number to any desired digit.Example#include using namespace std; //calculating minimum operations required int cal_min(long long int num){ //calculating remainder and operations int rem; int count = 0; while (num) { rem = num % 10; if (!(rem == 3 || rem == 8)) count++; num /= 10; } return count; } int main(){ long long int num = 2341974; cout
Read MoreString to Integer (atoi) in C++
Suppose we have to design a module, that first discards as many whitespace characters as necessary until the first non-whitespace character is reached. After that, starting from this character, it takes an optional initial plus sign or minus sign followed by as many numerical digits, and interprets them as a numerical value.When the first sequence of non-whitespace characters in str is not a valid integral number, or when no such sequence exists because either str is empty or it contains only whitespaces, no conversion will be performed.So if the input is like “-45”, the output will be -45.To solve this, ...
Read Moreiswlower() function in C++ STL
In C++ standard template library(STL), iswlower() function is used to check if the given wide character is in lowercase or not, if not then the function will return a zero value. The characters with ASCII value from 97 to 122 i.e. a-z are the lowercase alphabetic letters. Iswlower() function is present in cctype header file in C/C++.Syntax of iswlower () is as followsint iswlower (wint_t c)Parameters − c is a wide character to be checked, casted to a wint_t, or WEOF where wint_t is an integral type.Return Value − islower() function return non-zero value when the string is in lowercase ...
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