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实验1

时间：2024-10-15 22:21:17浏览次数：5  
标签：begin end cout int v0 实验 include

task1:

include

include

include

include

using namespace std;

// 声明
// 模板函数声明
template
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
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 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 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

include

include

include

include

include

using namespace std;

// 函数声明
// 模板函数声明
template
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
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 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 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

include

include

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)

{

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

include

include

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;  
  

if (x == 0) {  
    return "0";  
}  
  

bool isNegative = x < 0;  
if (isNegative) {  
    x = -x;  
}  
  
while (x > 0) {  
    result += digits[x % n];  
    x /= n;  
}  
  
if (isNegative) {  
    result += "-";  
}  
  

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

include

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

include

include

include

using namespace std;

int randomInRange(int min, int max) {
return rand() % (max - min + 1) + min;
}

pair<int, int> generateDivisiblePair() {
int divisor = randomInRange(1, 10);
int dividend = divisor * randomInRange(1, 10);
return {dividend, divisor};
}

pair<int, int> generateSubtractPair() {
int minuend = randomInRange(2, 10);
int subtrahend = randomInRange(1, minuend - 1);
return {minuend, subtrahend};
}

double generateAndEvaluateQuestions() {
srand(static_cast(time(0)));
int correctAnswers = 0;

for (int i = 0; i < 10; ++i) {  
    int operation = randomInRange(0, 3);
    pair<int, int> operands;  
      
    switch (operation) {  
        case 0:   
            operands = {randomInRange(1, 10), randomInRange(1, 10)};  
            cout << operands.first << " + " << operands.second << " = ";  
            break;  
        case 1:  
            operands = generateSubtractPair();  
            cout << operands.first << " - " << operands.second << " = ";  
            break;  
        case 2: 
            operands = {randomInRange(1, 10), randomInRange(1, 10)};  
            cout << operands.first << " * " << operands.second << " = ";  
            break;  
        case 3:  
            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;
}
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标签：begin,end,cout,int,v0,实验,include
From： https://www.cnblogs.com/karis/p/18468669

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