Task1:
// 现代C++标准库、算法库体验 // 本例用到以下内容: // 1. 字符串string, 动态数组容器类vector、迭代器 // 2. 算法库:反转元素次序、旋转元素 // 3. 函数模板、const引用作为形参 #include <iostream> #include <string> #include <vector> #include <algorithm> using namespace std; // 声明 // 模板函数声明 template<typename T> void output(const T &c); // 普通函数声明 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(); } // 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; } // 测试1 // 组合使用算法库、迭代器、string反转字符串 void test1() { string s0{"0123456789"}; cout << "s0 = " << s0 << endl; string s1{s0}; reverse(s1.begin(), s1.end()); // 反转指定迭代器区间的元素 cout << "s1 = " << s1 << endl; string s2{s0}; reverse_copy(s0.begin(), s0.end(), s2.begin()); // 将指定迭代区间的元素拷贝到指定迭代器开始的目标区间,并且在复制过程中反转次序 cout << "s2 = " << s2 << endl; } // 测试2 // 组合使用算法库、迭代器、vector反转动态数组对象vector内数据 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); } // 测试3 // 组合使用算法库、迭代器、vector实现元素旋转移位 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()); // 旋转指定迭代器区间[v1.begin(), v1.end())之间的数据项,旋转后从迭代器v1.begin()+1位置的数据项开始 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); }
Task2:
#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; }
Task3:
#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 //使用 while (cin >> s) 读取多组输入,直到按下 Ctrl+Z(在Windows上)或 Ctrl+D(在Unix/Linux上)结束输入。 cout << boolalpha << is_palindrome(s) << endl;//boolalpha 用于以布尔值形式输出 true 或 false。 } bool is_palindrome(std::string s) { // 转换为小写并去除非字母数字字符(可选,根据需求) // 如果不需要,可以删除以下两行 std::transform(s.begin(), s.end(), s.begin(), ::tolower); s.erase(std::remove_if(s.begin(), s.end(), [](unsigned char c){ return !std::isalnum(static_cast<unsigned char>(c)); }), s.end()); int left = 0; int right = s.size() - 1; while (left < right) { if (s[left] != s[right]) { return false; } left++; right--; } return true; } // 函数is_palindrom定义 // 待补足 // ×××
Task4:
#include <iostream> #include <string> #include <algorithm> std::string dec2n(int x, int n = 2) { if (n < 2 || n > 36) { std::cout<<"wrong"<<endl; } const std::string digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; std::string result; // Handle zero explicitly, to avoid empty result if (x == 0) { return "0"; } // Convert to the desired base bool isNegative = x < 0; if (isNegative) { x = -x; } while (x > 0) { result += digits[x % n]; x /= n; } if (isNegative) { result += "-"; } // Reverse the result since we built it from least significant digit to most std::reverse(result.begin(), result.end()); return result; } int main() { using namespace std; 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 // ×××
Task5:
#include<iostream> #include<iomanip> using namespace std; int main() { int count=1; int i,j; cout<<" "; for(i=97;i<97+26;i++) { cout<<setw(2)<<char(i); } cout<<endl; for(i=1;i<=26;i++) { cout<<setw(2)<<i; for(j=i+1;j<=26;j++) { cout<<setw(2)<<char(j+64); } for(j=1;j<=i;j++) { cout<<setw(2)<<char(j+64); } cout<<endl; } return 0; }
Task6:
#include <iostream> #include <cstdlib> #include <ctime> #include <iomanip> using namespace std; // 生成随机数,范围在[min, max]之间 int randomInRange(int min, int max) { return rand() % (max - min + 1) + min; } // 生成除法题目时,确保能整除 pair<int, int> generateDivisiblePair() { int divisor = randomInRange(1, 10); int dividend = divisor * randomInRange(1, 10); // 确保能整除 return {dividend, divisor}; } // 生成减法题目时,确保第一个操作数大于第二个操作数 pair<int, int> generateSubtractPair() { int minuend = randomInRange(2, 10); // 至少为2以确保可以找到一个较小的减数 int subtrahend = randomInRange(1, minuend - 1); // 减数小于被减数 return {minuend, subtrahend}; } // 生成题目并评测用户答案 double generateAndEvaluateQuestions() { srand(static_cast<unsigned>(time(0))); // 设置随机种子为当前时间 int correctAnswers = 0; for (int i = 0; i < 10; ++i) { int operation = randomInRange(0, 3); // 0: 加, 1: 减, 2: 乘, 3: 除 pair<int, int> operands; switch (operation) { case 0: // 加法 operands = {randomInRange(1, 10), randomInRange(1, 10)}; cout << operands.first << " + " << operands.second << " = "; break; case 1: // 减法 operands = generateSubtractPair(); cout << operands.first << " - " << operands.second << " = "; break; case 2: // 乘法 operands = {randomInRange(1, 10), randomInRange(1, 10)}; cout << operands.first << " * " << operands.second << " = "; break; case 3: // 除法 operands = generateDivisiblePair(); cout << operands.first << " / " << operands.second << " = "; break; } int userAnswer; cin >> userAnswer; int correctAnswer; switch (operation) { case 0: correctAnswer = operands.first + operands.second; break; case 1: correctAnswer = operands.first - operands.second; break; case 2: correctAnswer = operands.first * operands.second; break; case 3: correctAnswer = operands.first / operands.second; break; } if (userAnswer == correctAnswer) { ++correctAnswers; } } double accuracy = static_cast<double>(correctAnswers) / 10 * 100; cout << fixed << setprecision(2) << "正确率: " << accuracy << "%" << endl; return accuracy; } int main() { generateAndEvaluateQuestions(); return 0; }
标签:begin,end,cout,int,v0,实验,include From: https://www.cnblogs.com/karis/p/18508632