实验1
实验任务1：
1 #include<iostream> 2 #include<string> 3 #include<vector> 4 #include<algorithm> 5 6 using namespace std; 7 8 template<typename T> 9 void output(const T &c); 10 11 void test1(); 12 void test2(); 13 void test3(); 14 15 int main(){ 16 cout << "测试1：\n"; 17 test1(); 18 19 cout <<"\n测试2：\n"; 20 test2(); 21 22 cout << "\n测试3：\n"; 23 test3(); 24 } 25 26 template <typename T> 27 void output(const T &c){ 28 for(auto &i: c) 29 cout << i << " "; 30 cout << endl; 31 } 32 33 void test1(){ 34 string s0{"0123456789"}; 35 cout << "s0 = " << s0 << endl; 36 37 string s1{s0}; 38 reverse(s1.begin(),s1.end()); 39 cout << "s1 = " << s1 <<endl; 40 41 string s2{s0}; 42 reverse_copy(s0.begin(),s0.end(),s2.begin()); 43 cout << "s2 = " << s2 <<endl; 44 } 45 46 void test2(){ 47 vector<int> v0{2,0,4,9}; 48 cout << "v0: "; 49 output(v0); 50 51 vector<int> v1{v0}; 52 reverse(v1.begin(),v1.end()); 53 cout<<"v1: "; 54 output(v1); 55 56 vector<int> v2{v0}; 57 reverse_copy(v0.begin(),v0.end(),v2.begin()); 58 cout << "v2: "; 59 output(v2); 60 } 61 62 void test3(){ 63 vector<int> v0{0,1,2,3,4,5,6,7,8,9}; 64 cout << "v0: "; 65 output(v0); 66 67 vector<int> v1{v0}; 68 rotate(v1.begin(),v1.begin()+1,v1.end()); 69 cout << "v1: "; 70 output(v1); 71 72 vector<int> v2{v0}; 73 rotate(v2.begin(),v2.begin()+2,v2.end()); 74 cout << "v2: "; 75 output(v2); 76 77 vector<int> v3{v0}; 78 rotate(v3.begin(),v3.end()-1,v3.end()); 79 cout<< "v3: "; 80 output(v3); 81 82 vector<int> v4{v0}; 83 rotate(v4.begin(),v4.end()-2,v4.end()); 84 cout << "v4: "; 85 output(v4); 86 }
实验任务2：
1 #include<iostream> 2 #include<vector> 3 #include<string> 4 #include<algorithm> 5 #include<numeric> 6 #include<iomanip> 7 8 using namespace std; 9 10 template<typename T> 11 void output(const T &c); 12 13 int ran_int_100(); 14 void test1(); 15 void test2(); 16 17 int main(){ 18 cout << "测试1： \n"; 19 test1(); 20 21 cout << "\n测试2： \n"; 22 test2(); 23 } 24 template <typename T> 25 void output(const T &c){ 26 for(auto &i: c) 27 cout << i << " "; 28 cout << endl; 29 } 30 31 int rand_int_100(){ 32 return rand() % 101; 33 } 34 35 void test1(){ 36 vector<int> v0(10); 37 generate(v0.begin(),v0.end(),rand_int_100); 38 cout << "v0: "; 39 output(v0); 40 41 vector<int> v1{v0}; 42 sort(v1.begin(),v1.end()); 43 44 cout << "v1: "; 45 output(v1); 46 47 vector<int> v2{v0}; 48 sort(v2.begin()+1,v2.end()-1); 49 cout<< "v2: "; 50 output(v2); 51 } 52 53 void test2(){ 54 vector<int> v0(10); 55 generate(v0.begin(),v0.end(),rand_int_100); 56 cout << "v0: "; 57 output(v0); 58 59 auto iter1 = min_element(v0.begin(),v0.end()); 60 cout << "最小值: " << *iter1 <<endl; 61 62 auto iter2 = max_element(v0.begin(),v0.end()); 63 cout << "最大值: " << *iter2 <<endl; 64 65 auto ans = minmax_element(v0.begin(),v0.end()); 66 cout << "最小值: " << *(ans.first) <<endl; 67 cout << "最大值: " << *(ans.second) <<endl; 68 double avgl = accumulate(v0.begin(),v0.end(),0)/v0.size(); 69 cout << "均值：" << fixed <<setprecision(2)<<avgl <<endl; 70 71 cout << endl; 72 73 vector<int> v1{v0}; 74 cout << "v0: "; 75 output(v0); 76 sort(v1.begin(),v1.end()); 77 double avg2 = accumulate(v1.begin()+1,v1.end()-1,0)/(v1.size()-2); 78 cout << "去掉最大值、最小值之后，均值：" << avg2 <<endl; 79 80 }
实验任务3：
1 #include <iostream> 2 #include <string> 3 #include <algorithm> 4 bool is_palindrome(std::string s); 5 6 int main() { 7 using namespace std; 8 string s; 9 while(cin >> s) 10 cout << boolalpha << is_palindrome(s) << endl; 11 } 12 13 bool is_palindrome(std::string a){ 14 int len = a.size(); 15 std::string b = a; 16 char t; 17 int i; 18 for(i=0;i<len/2;i++){ 19 t = a[i]; 20 a[i] = a[len-1-i]; 21 a[len-i-1] = t; 22 } 23 if(b == a){ 24 return true; 25 }else{ 26 return false; 27 } 28 }
实验任务4：
1 #include <iostream> 2 #include <string> 3 #include <algorithm> 4 std::string dec2n(int x, int n = 2); 5 int main() { 6 using namespace std; 7 int x; 8 while(cin >> x) { 9 cout << "十进制: " << x << endl; 10 cout << "二进制: " << dec2n(x) << endl; 11 cout << "八进制: " << dec2n(x, 8) << endl; 12 cout << "十六进制: " << dec2n(x, 16) << endl << endl; 13 } 14 } 15 16 std::string dec2n(int x,int n){ 17 using namespace std; 18 int i; 19 int y = x; 20 string j; 21 string res = "0123456789ABCDEF"; 22 while(y != 0){ 23 i = y % n; 24 j = res[i] + j; 25 y/=n; 26 } 27 if(x == 0){ 28 return "0"; 29 }else{ 30 return j; 31 } 32 }
实验任务5：
1 #include<iostream> 2 #include<string> 3 #include<vector> 4 #include<algorithm> 5 #include<iomanip> 6 7 using namespace std; 8 9 template<typename T> 10 void output(const T &c); 11 12 void fun(); 13 14 int main(){ 15 cout << " 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" << endl; 16 int i; 17 for(i=1;i<=26;i++){ 18 fun(); 19 } 20 } 21 22 template <typename T> 23 void output(const T &c){ 24 for(auto &i: c) 25 cout << i << " "; 26 cout << endl; 27 } 28 int j=1; 29 void fun(){ 30 string s0={"ABCDEFGHIJKLMNOPQRSTUVWXYZ"}; 31 rotate(s0.begin(),s0.begin()+j,s0.end()); 32 cout << setw(2) << j << " "; 33 output(s0); 34 j++; 35 }
实验任务6：
1 #include <iostream> 2 #include <cstdlib> 3 #include <ctime> 4 #include <iomanip> 5 6 using namespace std; 7 8 int ran_int_10(); 9 10 int rand_int_10(){ 11 return rand() % 10; 12 } 13 14 int main() { 15 srand(static_cast<unsigned int>(time(nullptr))); 16 int sum = 0; 17 for (int i = 0; i < 10; ++i) { 18 int num1 = rand_int_10() % 10 + 1; 19 int num2 = rand_int_10() % 10 + 1; 20 int operators = rand() % 4; 21 int res; 22 string operation; 23 switch (operators) { 24 int t; 25 case 0: 26 operation = "*"; 27 res = num1 * num2; 28 break; 29 case 1: 30 if (num1 % num2!= 0) { 31 if (num1 < num2) { 32 t = num1; 33 num1 = num2; 34 num2 = t; 35 } 36 num1 = num1 % num2 == 0? num1 : num2 * (rand() % (num1 / num2) + 1); 37 } 38 operation = "/"; 39 res = num1 / num2; 40 break; 41 case 2: 42 operation = "+"; 43 res = num1 + num2; 44 break; 45 case 3: 46 if (num1 < num2) { 47 t = num1; 48 num1 = num2; 49 num2 = t; 50 } 51 operation = "-"; 52 res = num1 - num2; 53 break; 54 } 55 int answer; 56 cout << num1 << " " << operation << " " << num2 << " = "; 57 cin >> answer; 58 if (answer == res) { 59 sum++; 60 } 61 } 62 double accuracy = (double)sum / 10 * 100; 63 cout << "正确率为：" << accuracy << "%"; 64 return 0; 65 }
实验总结：
1.学习了rotate、reverse的用法；
2.运用C++语言来编写程序，逐步将思维从C语言向C++语言转换；
3.学习运用vector来存储数据、对数据进行处理
