实验一
任务一:
代码:
#include <iostream> #include <string> #include <vector> #include <algorithm> using namespace std; template<typename T> void output(const T &c); void test1(); void test2(); void test3(); int main(){ cout <<"测试1:\n"; test1(); cout <<"\n测试2:\n"; test2(); cout <<"\n测试3:\n"; test3(); } template<typename T> void output (const T &c){ for(auto &i:c){ cout << i<<" "; } cout << endl; } void test1(){ string s0{"0123456789"}; cout << "s0="<<s0<<endl; string s1{s0}; reverse(s1.begin(),s1.end()); cout<<"s1="<<s1<<endl; string s2{s0}; reverse_copy(s0.begin(),s0.end(),s2.begin()); cout <<"s2="<<s2<<endl; } void test2(){ vector<int> v0{2,0,4,9}; cout <<"v0: "; output(v0); vector<int> v1{v0}; reverse(v1.begin(),v1.end()); cout <<"v1: "; output(v1); vector<int> v2{v0}; reverse_copy(v0.begin(),v0.end(),v2.begin()); cout <<"v2: "; output(v2); } void test3(){ vector<int> v0{0,1,2,3,4,5,6,7,8,9}; cout <<"v0: "; output(v0); vector<int> v1{v0}; rotate(v1.begin(),v1.begin()+1,v1.end()); cout <<"v1: "; output(v1); vector<int> v2{v0}; rotate(v2.begin(),v2.begin()+2,v2.end()); cout<<"v2: "; output(v2); vector<int> v3{v0}; rotate(v3.begin(),v3.end()-1,v3.end()); cout << "v3: "; output(v3); vector<int> v4{v0}; rotate(v4.begin(),v4.end()-2,v4.end()); cout<<"v4: "; output(v4); }
运行截图:
任务二:
#include <iostream> #include <vector> #include <string> #include <algorithm> #include <numeric> #include <iomanip> using namespace std; // 函数声明 // 模板函数声明 template<typename T> void output(const T &c); // 普通函数声明 int rand_int_100(); void test1(); void test2(); int main() { cout << "测试1: \n"; test1(); cout << "\n测试2: \n"; test2(); } // 函数实现 // 输出容器对象c中的元素 template <typename T> void output(const T &c) { for(auto &i: c) cout << i << " "; cout << endl; } // 返回[0, 100]区间内的一个随机整数 int rand_int_100() { return rand() % 101; } // 测试1 // 对容器类对象指定迭代器区间进行赋值、排序 void test1() { vector<int> v0(10); // 创建一个动态数组对象v0, 对象大小为10 generate(v0.begin(), v0.end(), rand_int_100); // 产生[0, 100]之间的随机整数赋值给指定迭代器区间[v0.begin(), v0.end())内的每个数据项 cout << "v0: "; output(v0); vector<int> v1{v0}; sort(v1.begin(), v1.end()); // 对指定迭代器区间[v1.begin(), v1.end())内数据项进行升序排序 cout << "v1: "; output(v1); vector<int> v2{v0}; sort(v2.begin()+1, v2.end()-1); // 对指定迭代器区间[v1.begin()+1, v1.end()-1)内数据项进行升序排序 cout << "v2: "; output(v2); } // 测试2 // 对容器类对象指定迭代器区间进行赋值、计算最大值/最小值/均值 void test2() { vector<int> v0(10); generate(v0.begin(), v0.end(), rand_int_100); cout << "v0: "; output(v0); auto iter1 = min_element(v0.begin(), v0.end()); cout << "最小值: " << *iter1 << endl; auto iter2 = max_element(v0.begin(), v0.end()); cout << "最大值: " << *iter2 << endl; auto ans = minmax_element(v0.begin(), v0.end()); cout << "最小值: " << *(ans.first) << endl; cout << "最大值: " << *(ans.second) << endl; double avg1 = accumulate(v0.begin(), v0.end(), 0)/v0.size(); cout << "均值: " << fixed << setprecision(2) << avg1 << endl; cout << endl; vector<int> v1{v0}; cout << "v0: "; output(v0); sort(v1.begin(), v1.end()); double avg2 = accumulate(v1.begin()+1, v1.end()-1, 0)/(v1.size()-2); cout << "去掉最大值、最小值之后,均值: " << avg2 << endl; }
运行截图:
任务三:
代码:
#include <iostream> #include <string> #include <algorithm> bool is_palindrome(std::string s); int main() { using namespace std; string s; while(cin >> s) // 多组输入,直到按下Ctrl+Z后结束测试 cout << boolalpha << is_palindrome(s) << endl; } // 函数is_palindrom定义 // 待补足 // ××× bool is_palindrome(std::string s){ std::string b{s}; reverse(s.begin(),s.end());//翻转字符串 if(b==s) { return true; } else{ return false; } }
截图:
任务四:
#include <iostream> #include <string> #include <algorithm> using namespace std; std::string dec2n(int x, int n = 2); int main() { int x; while(cin >> x) { cout << "十进制: " << x << endl; cout << "二进制: " << dec2n(x) << endl; cout << "八进制: " << dec2n(x, 8) << endl; cout << "十六进制: " << dec2n(x, 16) << endl << endl; } } // 函数dec2n定义 // 待补足 // ××× std::string dec2n(int x, int n){ if(n == 2 || n == 8){ std::string str = ""; while(x / n != 0){ str += char('0'+x%n); x /= n; } str += char('0'+x%n); reverse(str.begin(),str.end()); return str; }else if(n == 16){ char arr[16] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'}; std::string str = ""; while(x / n != 0){ str += arr[x%n]; x /= n; } str += arr[x%n]; reverse(str.begin(),str.end()); return str; } }
截图:
任务五:
代码:
#include <iostream> #include <string> #include <algorithm> #include <vector> #include <iomanip> using namespace std; int main() { cout << " "; vector<char> arr; for(int i = 0;i < 26;i++){ cout << " "; cout << char('a' + i); arr.push_back(char('A' + i)); } cout << endl; for(int i = 1;i <= 26;i++){ cout << setw(2) << setfill(' ') << i; rotate(arr.begin(),arr.begin() + 1,arr.end()); for(auto ele:arr){ cout << " "; cout << ele; } cout << endl; } return 0; }
截图:
任务六:
#include <iostream> #include <cstdlib> #include <ctime> using namespace std; int main() { int m=0; for(int i=0;i<10;i++){ srand(time(0)); char op = "+-*/"[rand() % 4]; int w = 0; int a; int b; int c; switch (op) { case '+': a = rand() % 10+1; // 生成一个1到9之间的随机整数 b = rand() % 10+1 ; w = a + b; break; case '-': a = rand() % 10+1; // 生成一个1到9之间的随机整数 b = rand() % a+1 ; w=a-b; break; case '*':w=a*b; break; case '/': a= rand() % 10+1; // 生成一个1到9之间的随机整数 for(int i=2;i<=a;i++){ b=i; for(int j=1;j<=10;j++){ c=j; if(b*c==a){ w=a/b;break; } } } } cout << a << ' ' << op << ' ' << b << '=' ; int user_answer = 0; cin >> user_answer; cout<<endl; if (user_answer == w) { m++; } } cout<<"正确率:"<<m*10<<"%"<<endl; return 0; }
截图: