Question

In C++

Create a vector of size 1000, fill it with random numbers, use algorithm/lambda to count how many odd numbers there are. Display only the odd numbers.

Answer 1

#include <iostream>
#include <algorithm>
#include <functional>
#include <vector>
#include <cstdlib>
#include <ctime>

using namespace std;

int main() {
    srand(time(NULL));
    int size = 1000;
    vector<int> v;
    for (int i = 0; i < size; ++i) {
        v.push_back(rand() % 1000);
    }

    cout << "Odd numbers in vector are: ";
    for_each(v.begin(), v.end(), [](int n) {
        if (n % 2 == 1) {
            cout << n << " ";
        }
    });
    auto n = count_if(v.begin(), v.end(), bind(logical_not<bool>(), bind(modulus<int>(), placeholders::_1, 2)));
    cout << "\n\nNumber of odd numbers is " << n << endl;
    cout << endl;
    return 0;
}