task1
代码:
#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); }
运行截图:
task2
代码:
#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10generate(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; }
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task3
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; }bool is_palidrome(std::string s){using namespace std;string s1{s};reverse(s1.begin(),s1.end());if(s1==s)return true;elsereturn false; }
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task4
代码:
#include <iostream> #include <cstring> #include <algorithm>std::string dec2n(int x, int n = 2);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;} }std::string dec2n(int x,int n){using namespace std;if(x==0)return "0";string str;string i="0123456789ABCDEF";while(x>0){int j=x%n;x=x/n;str=str+i[j];}reverse(str.begin(),str.end());return str; }
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task5
代码:
#include<iostream> #include<string> #include<vector> #include<algorithm> #include<iomanip> using namespace std;int main(){cout<<" ";for(int i=0;i<26;i++)cout<<(char)(i+97)<<" ";cout<<endl;vector<char> v0{'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};for(int i=1;i<27;i++){vector<char> v1{v0};rotate(v1.begin(),v1.begin()+i,v1.end());cout<<setw(2)<<i<<" ";for(int j=0;j<26;j++){cout<<" "<<v1[j];}cout<<endl;} }
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task6
代码:
#include<iostream> #include<stdlib.h> #include<time.h> #include<iomanip> using namespace std;int main(){int a,b,c,d,t;double score=0;srand(time(NULL));for(int i=0;i<10;i++){a=rand()%10;b=rand()%10;t=rand()%4;if(t==1&&a<b)t=0;if(t==3&&a%b!=0)t=2;switch(t){case 0:cout<<a<<"+"<<b<<"=";c=a+b;break;case 1:cout<<a<<"-"<<b<<"=";c=a-b;break;case 2:cout<<a<<"*"<<b<<"=";c=a*b;break;case 3:cout<<a<<"/"<<b<<"=";c=a/b;break;}cin>>d;if(c==d)score=score+10;}cout<<fixed<<setprecision(2)<<score<<"%"<<endl; }
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