Ai giúp mình với, tin học 11

Tính tổng chẵn các phần tử mảng.

Dữ liệu lấy từ tệp DL.txt

Ghi kết quả ra tệp KQ.txt

VD. DL.txt KQ.txt

5 N 20

2 a1

3 a2

4 a3

5 a4

6 a5

1 câu trả lời

Đề không rõ lắm, tổng chẵn mà output là xuất tổng mảng, mình làm 2 cái nhé.

Tổng các phần tử chẵn:

#include <iostream>
using namespace std;

int n, x, res = 0;

int main() {
    freopen("DL.txt", "r", stdin);
    freopen("KQ.txt", "w", stdout);
    cin >> n;
    for(int i = 0; i < n; ++i) {
        cin >> x;
        if(x % 2 == 0) res += x;
    }

    cout << res;
}

Tổng mảng:

#include <iostream>
using namespace std;

int n, x, res = 0;

int main() {
    freopen("DL.txt", "r", stdin);
    freopen("KQ.txt", "w", stdout);
    cin >> n;
    for(int i = 0; i < n; ++i) {
        cin >> x;
        res += x;
    }

    cout << res;
}

Câu hỏi trong lớp Xem thêm

giup e voi I/ Supply the correct form of the verbs in brackets 1. You (think) ……………………… collecting stamps costs much money? 2. Every year, my mother (give) ……………………… me a nice doll on my birthday. 3. Jenny says she loves collecting pens but she (not/continue) ……………………… this hobby from next year. 4. If you wash your hands more, you (have)……………………. less chance of catching flu. 5. Getting plenty of rest is very good. It (help)…………………. you to avoid depression. 6. Mr. John (be) ……………………… principal of our school since last year. 7. I (see) ……………………… a car accident on this corner yesterday. 8. We like (come)……………………to school by bus, but we hate (stand)………………………. and (wait) …………………… in the rain. 9. ……………………… (you/ ever/ meet) anyone famous? 10. My mother (come) ……………………… to stay with us next weekend. 11. When he lived in Manchester, he (work) ……………………… in a bank. 12. We (be) ……………………… students for four years. 13. We are planting trees around our school now. Our school (be) ……………………… surrounded by a lot of green trees. 14. What ……………………… your father usually ……………………… (do) in the evenings? 15. My sister likes (cook) ……………………… very much. She can cook many good foods. 16. My father says when he's retired, he (go) …………………… back to his village to do the gardening. 17. They want (buy) ……………………… some meat for dinner. 18. Linh is my best friend. We (know) ……………………… each other for 5 years. 19. I enjoy (fish) ……………………… because it is relaxing. 20. How about (go) ……………………… to the movie theatre?

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