C++输入输出

1.不确定多少行，每行不确定多少个数

输入：

1 2 3
4 5
0 0 0 0 0

输出：

6
9
0

int main() {
    int num, sum = 0;
    while (cin >> num) {
        sum += num;
        if (cin.get() == '\n') {
            cout << sum << endl;
            sum = 0;
        }
    }
    return 0;
}

2.字符串输入

a c bb
f dddd
nowcoder

a bb c
dddd f
nowcoder

int main(){
    vector<string> strs;
    string str;
    while (cin >> str) {
        strs.emplace_back(str);
        if (cin.get() == '\n') {
            sort(strs.begin(), strs.end());
            for (string s: strs) cout << s << ' ';
            cout << endl;
            strs.clear();
        }
    }
    return 0;
}

3.字符串输入，逗号分隔

a,c,bb
f,dddd
nowcoder

a,bb,c
dddd,f
nowcoder

int main() {
    string str;
    vector<string> strs;
    while (getline(cin, str)) {
        stringstream ss(str);
        string substr;
        while (getline(ss, substr, ',')) {
            strs.push_back(substr);
        }
        sort(strs.begin(), strs.end());
        for (int i = 0; i < strs.size() - 1; ++i) {
            cout << strs[i] << ',';
        }
        cout << strs.back() << endl;;
        strs.clear();
    }
    return 0;
}