知识点：

分支控制：分支控制 

#include <iostream>
using namespace std;

int main() {
    int num = 0;
    int positive = 0;
    int negative = 0;

    while (cin >> num) {
        if (num > 0) {
            positive++;
        } else {
            negative++;
        }
    }

    cout << "positive:" << positive << endl;
    cout << "negative:" << negative << endl;

    return 0;
}