实验1 现代C++编程初体验

任务一

#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()); 
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);
}

任务二

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <numeric>
#include <iomanip>
using namespace std;

template<typename T>
void output(const T &c);
int rand_int_100();
void test1();
void test2();
int main() {
cout << "测试1: \n";
test1();
cout << "\n测试2: \n";
test2();
}
template <typename T>
void output(const T &c) {
for(auto &i: c)
cout << i << " ";
cout << endl;
}

int rand_int_100() {
return rand() % 101;
}

void test1() {
vector<int> v0(10);
generate(v0.begin(), v0.end(), rand_int_100); 
cout << "v0: ";
output(v0);
vector<int> v1{v0};
sort(v1.begin(), v1.end());
cout << "v1: ";
output(v1);
vector<int> v2{v0};
sort(v2.begin()+1, v2.end()-1);
cout << "v2: ";
output(v2);
}

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;
}

任务三

#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 s1{s};
	reverse(s1.begin(),s1.end());
	if(s1==s){
		return true;
	}
	else{
		return false;
	}
} 

任务四

#include <iostream>
#include <string>
#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;
}
}
// 函数dec2n定义
// 待补足
std::string dec2n(int x,int n){
	std::string s1;
	if(x==0){
		s1.push_back('0');
	}
	else{
		while(x){
			char c;
			int a;
			a=x%n;
			x/=n;
			if(a<10){
				c='0'+a;
				s1.push_back(c);
			}
			else{
				switch(a){
					case 10:c='A';break;
					case 11:c='B';break;
					case 12:c='C';break;
					case 13:c='D';break;
					case 14:c='E';break;
					case 15:c='F';break;
				}
				s1.push_back(c);
			}
			
		}
		reverse(s1.begin(),s1.end());
	}
	return s1;
}

任务五

#include<iostream>
#include<iomanip>
#include<string>

using namespace std;

int main(){
	string s("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
	for(int i=0;i<27;i++){
		for(int j=0;j<26;j++){
			if(j==0){
				if(i==0){
					cout<<setw(2)<<" ";
				}
				else{
					cout<<setw(2)<<i;
				}
			}
			else{
				if(i==0){
					cout<<setw(2)<<char(s[j-1]+32);
				}
				else{
					cout<<setw(2)<<s[(j+i-1)%26];
				}
			}
		}
		cout<<endl;
	}
}

任务六

#include<iostream>
#include<iomanip>
#include<stdlib.h>
#include<time.h>
#include<map>

using namespace std;

int main(){
	int a,b,c,d,res,count=0;
	float e;
	char x;
	map<int,char>mp={{1,'+'},{2,'-'},{3,'*'},{4,'/'}};
	srand(time(NULL));
	
	for(int i=0;i<10;i++){
		
		a=rand()%10+1;
		b=rand()%10+1;
		c=rand()%4+1;
		if(c==2){
			while(a<b){
				a=rand()%10+1;
			}
		}
		else if(c==4){
			while(a%b!=0){
				a=rand()%10+1;
				
			}
		}
		switch(c){
			case 1:res=a+b;break;
			case 2:res=a-b;break;
			case 3:res=a*b;break;
			case 4:res=a/b;break;
		}
		cout<<setw(2)<<a<<setw(2)<<mp[c]<<setw(2)<<b<<setw(2)<<"=";
		cin>>d;
		if(d==res){
			count++;
		}
	}
	e=count*10;
	cout<<fixed<<setprecision(2)<<e<<"%"<<endl;
	
}