W3School TIY Editor

#include <iostream> #include <vector> #include <algorithm> using namespace std; bool greater_than_5(int value) { return value > 5; } int main() { vector<int> numbers = {1, 7, 3, 5, 9, 2}; int amount = count_if(numbers.begin(), numbers.end(), greater_than_5); cout << "共有 " << amount << " 个大于 5 的值。"; return 0; }