“binary search function in c++” Code Answer’s

how to do binary search in c++ using STL

cpp by Anxious Aardvark on Jan 11 2021 Donate

11

// BY shivam kumar KIIT #include<bits/stdc++.h> usind namespace std; int main() { int arr[]={10,2,34,2,5,4,1}; sort(arr,arr+7);//sort array in ascending order before using binary search binary_search(arr,arr+7,10);//return 1 as element is found binary_search(arr,arr+7,3);//return 0 as element is not found return 0; }

binary search program c++

cpp by CodeMyFingah         on Oct 31 2020 Donate

7

#include <iostream> using namespace std; // This program performs a binary search through an array, must be sorted to work int binarySearch(int array[], int size, int value) { int first = 0, // First array element last = size - 1, // Last array element middle, // Mid point of search position = -1; // Position of search value bool found = false; // Flag while (!found && first <= last) { middle = (first + last) / 2; // Calculate mid point if (array[middle] == value) // If value is found at mid { found = true; position = middle; } else if (array[middle] > value) // If value is in lower half last = middle - 1; else first = middle + 1; // If value is in upper half } return position; } int main () { const int size = 5; // size initialization int array[size] = {1, 2, 3, 4, 5}; // declare array of size 10 int value; // declare value to be searched for int result; // declare variable that will be returned after binary search cout << "What value would you like to search for? "; // prompt user to enter value cin >> value; result = binarySearch(array, size, value); if (result == -1) // if value isn't found display this message cout << "Not found\n"; else // If value is found, displays message cout << "Your value is in the array.\n"; return 0; }

binary search function in c++

cpp by Fine Fowl on Aug 13 2020 Donate

2

#include<iostream> using namespace std; int binarySearch(int arr[], int p, int r, int num) {    if (p <= r) {       int mid = (p + r)/2;       if (arr[mid] == num)       return mid ;       if (arr[mid] > num)       return binarySearch(arr, p, mid-1, num);       if (arr[mid] > num)       return binarySearch(arr, mid+1, r, num);    }    return -1; } int main(void) {    int arr[] = {1, 3, 7, 15, 18, 20, 25, 33, 36, 40};    int n = sizeof(arr)/ sizeof(arr[0]);    int num = 33;    int index = binarySearch (arr, 0, n-1, num);    if(index == -1)    cout<< num <<" is not present in the array";    else    cout<< num <<" is present at index "<< index <<" in the array";    return 0; }

Source: www.tutorialspoint.com

binary search in c++

cpp by Helpful_Heroin on Jul 20 2020 Donate

3

#include<iostream> using namespace std; int binarySearch(int arr[], int p, int r, int num) { if (p <= r) { int mid = (p + r)/2; if (arr[mid] == num) return mid ; if (arr[mid] > num) return binarySearch(arr, p, mid-1, num); if (arr[mid] < num) return binarySearch(arr, mid+1, r, num); } return -1; } int main(void) { int arr[] = {1, 3, 7, 15, 18, 20, 25, 33, 36, 40}; int n = sizeof(arr)/ sizeof(arr[0]); int num = 33; int index = binarySearch (arr, 0, n-1, num); if(index == -1) cout<< num <<" is not present in the array"; else cout<< num <<" is present at index "<< index <<" in the array"; return 0; }

c++ binary search

cpp by Helpless Hornet on Jan 24 2021 Donate

0

//requires header <algorithm> for std::binary_search #include <algorithm> #include <vector> bool binarySearchVector(const std::vector<int>& vector, int target) { //this line does all binary searching return std::binary_search(vector.cbegin(), vector.cend(), target); } #include <iostream> int main() { std::vector<int> haystack {1, 3, 4, 5, 9}; std::vector<int> needles {1, 2, 3}; for (auto needle : needles) { std::cout << "Searching for " << needle << std::endl; if (binarySearchVector(haystack, needle)) { std::cout << "Found " << needle << std::endl; } else { std::cout << "no dice!" << std::endl; } } }

c++ binary search

cpp by Weary Wren on Nov 28 2020 Donate

0

int result = -1; int low = 0; int high = N-1; // N - # of elements while (low <= high) { mid = (low + high) / 2; if ( item == vector[mid]) { result = mid; break; } else if (item > vector[mid] ) { low = mid + 1; } else { high = mid - 1; } }

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