// p7

string user_name;

const int seq_cnt = 6;

// 初始化

vector<int> fib,lucas,pell,tri,squre,penta;

vector<int> *seq_addrs[seq_cnt] = {

&fib, &lucas, &pell, &tri, &squre,&penta

};

int data[18] = {

1,2,3,

3,4,7,

2,5,12,

3,6,10,

4,9,16,

5,12,22

};

vector<int> *cur_vec_pointer;

for(int i=0; i<seq_cnt; i++){

cur_vec_pointer = seq_addrs[i];

cur_vec_pointer->insert(cur_vec_pointer->begin(), data+(3*i), data+(3*i+3)); // 对vector赋值

}

// 打印数列信息

for(int j=0; j<seq_cnt; j++){

cur_vec_pointer = seq_addrs[j];

cout<<j<<"数列: ";

for(int i=0; i<cur_vec_pointer->size(); i++){

cout<<cur_vec_pointer->at(i)<<' ';

}

cout<<endl;

}

bool next_seq = true; // 显示下一组数列

bool go_for_it = true; // 用户想再猜一次

bool got_it = false; // 用户是否猜对

int num_tries = 0; // 用户猜过的总次数

int num_right = 0; // 用户答对的次数

int user_guess;

char try_again;

while (next_seq){

// 随机抽取一个数列

int seq_index = rand() % seq_cnt; // rand()返回[0,max_int]

cur_vec_pointer = seq_addrs[seq_index];

// 打印数列信息

cout<<"Guess what it next item? ";

for(int i=0; i<cur_vec_pointer->size()-1; i++){

cout<<cur_vec_pointer->at(i)<<' ';

}

cout<<endl;

while (go_for_it && !got_it){

// 验证用户是否猜对

cin>>user_guess;

if (user_guess==cur_vec_pointer->at(2)) {

got_it = true;

num_right++;

}else{

cout<<"The answer is not right."

<<"Want to try again? (Y/N)";

cin>>try_again;

if(try_again=='N' || try_again=='n')

go_for_it = false;

}

num_tries++;

}

cout<<"Want to try another sequence? (Y/N)";

cin>>try_again;

if(try_again=='N' || try_again=='n') {

next_seq = false;

cout << "right/total="

<< (float) num_right / num_tries;

}else{

got_it = false;

go_for_it = true;

}

}

// p33

ifstream infile("data/seq_data.txt"); // Edit Configurations => Working dictionary

// ofstream out_file("data/seq_data.txt"); // 写覆盖

// ofstream out_file("seq_data.txt", ios_base::app); // 追加模式

string name;

int nt=0, nc=0;

if (!infile || !infile.is_open()){

cerr << "Unable to read file!\n";

} else{

while (infile>>name){

infile>>nt>>nc;

cout<<name<<", "

<<nt<<", "

<<nc<<endl;

}

}

// p7

string name;

cout << "Please input your name:";

cin >> name;

cout << '\n'

<< "Hello "

<< name

<< '\n';

//p7

string first_name, last_name;

cout << "Please input your first_name:";

cin >> first_name;

cout << "Please input your last_name:";

cin >> last_name;

cout << '\n'

<< "Hello "

<< last_name

<< " "

<< first_name

<< '\n';

// p33

cout<<"What's your name?"<<endl;

// C-stype: char-array

int cnt=0;

char name[10];

cin>>name;

for(int i=0; i<10; i++){

if(name[i]=='\0')

break;

cnt++;

}

if (cnt>2)

cout<<"Name is not valid.(length must <=2, , char[])"<<endl;

else

cout<<name<<" Valid. (char[])"<<endl;

// char*

char* line=new char[10];

cin>>line;

if(strlen(line)>2)

cout<<"Name is not valid.(length must <=2, char*)"<<endl;

else

cout<<line<<" Valid. (char*)"<<endl;

//string

string text;

cin>>text;

if(text.size()>2)

cout<<"Name is not valid.(length must <=2, string)"<<endl;

else

cout<<text<<" Valid.(string)"<<endl;

//p33

// 数组实现

int max_len=10;

int i=0, cur_val=0, sum=0, cnt=0;

int arr[max_len];

// 监视读入的元素个数，确保数组的读取操作不会越界

while (cin>>cur_val && cur_val!=-1 && i<max_len){

arr[i++] = cur_val;

cnt++;

}

for(i=0; i<cnt; i++) sum += arr[i];

float avg = (cnt==0?0:(float)sum/cnt);

cout<<"sum="<<sum<<", avg="<<avg<<endl;

// vector 实现

sum=0;

vector<int> vec;

while (cin>>cur_val && cur_val!=-1){

vec.push_back(cur_val);

}

for(i=0; i<vec.size(); i++){

sum += vec.at(i);

}

avg = (cnt==0?0:(float)sum/vec.size());

cout<<"sum="<<sum<<", avg="<<avg<<endl;

string cur_ch;

vector<string> vec;

fstream infile("data/ex0107.txt");

if(!infile){

cout<<"Read file failed."<<endl;

return;

}

while (infile>>cur_ch){

vec.push_back(cur_ch);

}

for(int i=0; i<vec.size(); i++) cout<< vec.at(i)<< " ";

cout<<endl;

// 排序

sort(vec.begin(), vec.end());

for(int i=0; i<vec.size(); i++) cout<< vec.at(i)<< " ";

cout<<endl;

}