Count If Threshold

std::count_if counts values that satisfy a predicate without writing the counting loop by hand.

count_if_threshold.cpp

#include <algorithm>
#include <iostream>
#include <vector>

int main() {
    std::vector<int> scores{72, 85, 91, 64};
    int minimum = ;

    int passing = static_cast<int>(std::count_if(scores.begin(), scores.end(),
        [minimum](int score) {
            return score >= minimum;
        }));

    std::cout << "minimum=" << minimum << std::endl;
    std::cout << "passing=" << passing << std::endl;
    return 0;
}

#include <algorithm>
#include <iostream>
#include <vector>

int main() {
    std::vector<int> scores{72, 85, 91, 64};
    int minimum = ;

    int passing = static_cast<int>(std::count_if(scores.begin(), scores.end(),
        [minimum](int score) {
            return score >= minimum;
        }));

    std::cout << "minimum=" << minimum << std::endl;
    std::cout << "passing=" << passing << std::endl;
    return 0;
}

#include <algorithm>
#include <iostream>
#include <vector>

int main() {
    std::vector<int> scores{72, 85, 91, 64};
    int minimum = ;

    int passing = static_cast<int>(std::count_if(scores.begin(), scores.end(),
        [minimum](int score) {
            return score >= minimum;
        }));

    std::cout << "minimum=" << minimum << std::endl;
    std::cout << "passing=" << passing << std::endl;
    return 0;
}

predicate A predicate is a function or lambda that returns true or false for each value.

count_if `std::count_if` applies a predicate over a range and returns the number of matches.