2016程序设计实习实验班免修考试(C++)

2017年2月22日6,6540

1:编程填空：计算数列平方和

#include <iostream>
using namespace std;
int sqr(int n);
int sum(int *a, int n, int f(int))
{
    int ans = 0;
    for(int i = 0; i < n; i++)
        ans += f(a[i]);
    return ans;
}
int sqr(int n) {
    return n * n;
}
int main() {
    int t, n, a[0x100];
    cin >> t;
    for (int c = 0; c < t; ++c) {
        cin >> n;
        for (int i = 0; i < n; ++i) cin >> a[i];
        cout << sum(a, n, sqr) << endl;
    }
    return 0;
}

#include <iostream>

using namespace std;

int sqr(int n);

int sum(int *a, int n, int f(int))

{

int ans = 0;

for(int i = 0; i < n; i++)

ans += f(a[i]);

return ans;

}

int sqr(int n) {

return n * n;

}

int main() {

int t, n, a[0x100];

cin >> t;

for (int c = 0; c < t; ++c) {

cin >> n;

for (int i = 0; i < n; ++i) cin >> a[i];

cout << sum(a, n, sqr) << endl;

}

return 0;

}

2:编程填空：MyString

#include <cstring>
#include <cstdlib>
#include <string>
#include <iostream>
using namespace std;
struct MyString{
    string str;
    MyString(){}
    MyString(string _str):str(_str){}
    MyString(char *c){
        int l = strlen(c);
        str = "";
        for(int i = 0; i < l; i++)
            str += c[i];
    }
    char& operator[](int x){
        return str[x];
    }
    string operator()(int x, int y){
        string ans = "";
        for(int i = 0; i < y; i++)
            ans += str[i + x];
        return ans;
    }
    string operator+=(MyString a){
        return str += a.str;
    }
    friend string operator+(MyString a, MyString b){
        return a.str + b.str;
    }
    friend bool operator<(MyString a, MyString b){
        return a.str < b.str;
    }
    friend bool operator>(MyString a, MyString b){
        return a.str > b.str;
    }
    friend bool operator==(MyString a, MyString b){
        return a.str == b.str;
    }
    friend ostream& operator <<(ostream& os, MyString a){
        os << a.str;
        return os;
    }
};
int CompareString( const void * e1, const void * e2)
{
	MyString * s1 = (MyString * ) e1;
	MyString * s2 = (MyString * ) e2;
	if( * s1 < *s2 )
		return -1;
	else if( *s1 == *s2)
		return 0;
	else if( *s1 > *s2 )
		return 1;
}
int main()
{
	MyString s1("abcd-"),s2,s3("efgh-"),s4(s1);
	MyString SArray[4] = {"big","me","about","take"};
	cout << "1. " << s1 << s2 << s3<< s4<< endl;
	s4 = s3;
	s3 = s1 + s3;
	cout << "2. " << s1 << endl;
	cout << "3. " << s2 << endl;
	cout << "4. " << s3 << endl;
	cout << "5. " << s4 << endl;
	cout << "6. " << s1[2] << endl;
	s2 = s1;
	s1 = "ijkl-";
	s1[2] = 'A' ;
	cout << "7. " << s2 << endl;
	cout << "8. " << s1 << endl;
	s1 += "mnop";
	cout << "9. " << s1 << endl;
	s4 = "qrst-" + s2;
	cout << "10. " << s4 << endl;
	s1 = s2 + s4 + " uvw " + "xyz";
	cout << "11. " << s1 << endl;
	qsort(SArray,4,sizeof(MyString),CompareString);
	for( int i = 0;i < 4;i ++ )
	cout << SArray[i] << endl;
	//s1的从下标0开始长度为4的子串
	cout << s1(0,4) << endl;
	//s1的从下标5开始长度为10的子串
	cout << s1(5,10) << endl;
	return 0;
}

#include <cstring>

#include <cstdlib>

#include <string>

#include <iostream>

using namespace std;

struct MyString{

string str;

MyString(){}

MyString(string _str):str(_str){}

MyString(char *c){

int l = strlen(c);

str = "";

for(int i = 0; i < l; i++)

str += c[i];

}

char& operator[](int x){

return str[x];

}

string operator()(int x, int y){

string ans = "";

for(int i = 0; i < y; i++)

ans += str[i + x];

return ans;

}

string operator+=(MyString a){

return str += a.str;

}

friend string operator+(MyString a, MyString b){

return a.str + b.str;

}

friend bool operator<(MyString a, MyString b){

return a.str < b.str;

}

friend bool operator>(MyString a, MyString b){

return a.str > b.str;

}

friend bool operator==(MyString a, MyString b){

return a.str == b.str;

}

friend ostream& operator <<(ostream& os, MyString a){

os << a.str;

return os;

}

};

int CompareString( const void * e1, const void * e2)

{

MyString * s1 = (MyString * ) e1;

MyString * s2 = (MyString * ) e2;

if( * s1 < *s2 )

return -1;

else if( *s1 == *s2)

return 0;

else if( *s1 > *s2 )

return 1;

}

int main()

{

MyString s1("abcd-"),s2,s3("efgh-"),s4(s1);

MyString SArray[4] = {"big","me","about","take"};

cout << "1. " << s1 << s2 << s3<< s4<< endl;

s4 = s3;

s3 = s1 + s3;

cout << "2. " << s1 << endl;

cout << "3. " << s2 << endl;

cout << "4. " << s3 << endl;

cout << "5. " << s4 << endl;

cout << "6. " << s1[2] << endl;

s2 = s1;

s1 = "ijkl-";

s1[2] = 'A' ;

cout << "7. " << s2 << endl;

cout << "8. " << s1 << endl;

s1 += "mnop";

cout << "9. " << s1 << endl;

s4 = "qrst-" + s2;

cout << "10. " << s4 << endl;

s1 = s2 + s4 + " uvw " + "xyz";

cout << "11. " << s1 << endl;

qsort(SArray,4,sizeof(MyString),CompareString);

for( int i = 0;i < 4;i ++ )

cout << SArray[i] << endl;

//s1的从下标0开始长度为4的子串

cout << s1(0,4) << endl;

//s1的从下标5开始长度为10的子串

cout << s1(5,10) << endl;

return 0;

}

3:编程填空：字符串排序

#include <iostream>
#include <string>
#include <list>
using namespace std;

class A{
private:
	string name;
public:
	A(string n) :name(n){}
	friend bool operator < (const class A& a1, const class A &a2);
	friend bool operator == (const class A &a1, const class A &a2){
		if (a1.name.size() == a2.name.size())
			return true;
		else
			return false;
	}
	friend ostream & operator << (ostream &o, const A &a){
		o << a.name;
		return o;
	}
	string get_name() const{
		return name;
	}
	int get_size() const{
		return name.size();
	}
};
bool operator<(const A &a, const A &b){
    return a.get_size() < b.get_size();
}
template <class T>
class MyLarge{
public:
    bool operator()(const T &a, const T &b){
        return a.get_name()[0] < b.get_name()[0];
    }
};
class Print{
public:
    void operator()(const string &x){
        cout << x << ' ';
    }
};
template <class T>
void Show(T l, T r, Print f)
{
    while(l != r){
        f((*l).get_name());
        l++;
    }
}
int main(int argc, char* argv[])
{
	list<A> lst;
	int ncase, n, i = 1;
	string s;
	cin >> ncase;
	while (ncase--){
		cout << "Case: "<<i++ << endl;
		cin >> n;
		for (int i = 0; i < n; i++){
			cin >> s;
			lst.push_back(A(s));
		}
		lst.sort();
		Show(lst.begin(), lst.end(), Print());

		cout << endl;
		lst.sort(MyLarge<A>());
		Show(lst.begin(), lst.end(), Print());
		cout << endl;
		lst.clear();

	}
	return 0;
}

#include <iostream>

#include <string>

#include <list>

using namespace std;

class A{

private:

string name;

public:

A(string n) :name(n){}

friend bool operator < (const class A& a1, const class A &a2);

friend bool operator == (const class A &a1, const class A &a2){

if (a1.name.size() == a2.name.size())

return true;

else

return false;

}

friend ostream & operator << (ostream &o, const A &a){

o << a.name;

return o;

}

string get_name() const{

return name;

}

int get_size() const{

return name.size();

}

};

bool operator<(const A &a, const A &b){

return a.get_size() < b.get_size();

}

template <class T>

class MyLarge{

public:

bool operator()(const T &a, const T &b){

return a.get_name()[0] < b.get_name()[0];

}

};

class Print{

public:

void operator()(const string &x){

cout << x << ' ';

}

};

template <class T>

void Show(T l, T r, Print f)

{

while(l != r){

f((*l).get_name());

l++;

}

int main(int argc, char* argv[])

{

list<A> lst;

int ncase, n, i = 1;

string s;

cin >> ncase;

while (ncase--){

cout << "Case: "<<i++ << endl;

cin >> n;

for (int i = 0; i < n; i++){

cin >> s;

lst.push_back(A(s));

}

lst.sort();

Show(lst.begin(), lst.end(), Print());

cout << endl;

lst.sort(MyLarge<A>());

Show(lst.begin(), lst.end(), Print());

cout << endl;

lst.clear();

}

return 0;

}

4:编程填空：人群的排序和分类

#include <iostream>
#include <set>
#include <iterator>
#include <algorithm>
using namespace std;
class A{
public:
    int k;
    A(){}
    A(int _k):k(_k){}
    virtual void print(){
        cout << 'A' << ' ' << k << endl;
    }
};
class B:public A{
public:
    B(int _k):A(_k){}
    void print(){
        cout << 'B' << ' ' << k << endl;
    }
};
class Comp{
public:
    bool operator()(const A* a, const A* b){
        return a->k < b->k;
    }
};
void Print(A* a)
{
    a->print();
}
int main()
{

	int t;
	cin >> t;
	set<A*,Comp> ct;
    while( t -- ) {
        int n;
        cin >> n;
        ct.clear();
        for( int i = 0;i < n; ++i)	{
            char c; int k;
            cin >> c >> k;
			
            if( c == 'A')
                ct.insert(new A(k));
            else
                ct.insert(new B(k));
        }	
        for_each(ct.begin(),ct.end(),Print);
        cout << "****" << endl;
    }
}

#include <iostream>

#include <set>

#include <iterator>

#include <algorithm>

using namespace std;

class A{

public:

int k;

A(){}

A(int _k):k(_k){}

virtual void print(){

cout << 'A' << ' ' << k << endl;

}

};

class B:public A{

public:

B(int _k):A(_k){}

void print(){

cout << 'B' << ' ' << k << endl;

}

};

class Comp{

public:

bool operator()(const A* a, const A* b){

return a->k < b->k;

}

};

void Print(A* a)

{

a->print();

}

int main()

{

int t;

cin >> t;

set<A*,Comp> ct;

while( t -- ) {

int n;

cin >> n;

ct.clear();

for( int i = 0;i < n; ++i) {

char c; int k;

cin >> c >> k;

if( c == 'A')

ct.insert(new A(k));

else

ct.insert(new B(k));

}

for_each(ct.begin(),ct.end(),Print);

cout << "****" << endl;

}

5:编程填空：数据库内的学生信息

#include <iostream>
#include <string>
#include <map>
#include <iterator>
#include <algorithm>
using namespace std;
// 在此处补充你的代码
template <class T1, class T2, class T3 = greater<T1> >
class MyMultimap: public multimap<T1, T2, T3>{
public:
    void Set(T1 a, T2 b){
        for(auto it = this->find(a); it->first == a; it++)
            it->second = b;
    }
};
template <typename T1,typename T2>
ostream& operator <<(ostream& os, pair<T1, T2> p){
    os << '(' << p.first << ',' << p.second << ')';
    return os;
}
struct Student 
{
	string name;
	int score;
};
template <class T>
void Print(T first,T last) {
	for(;first!= last; ++ first)
		cout << * first << ",";
	cout << endl;
}
int main()
{
	
    Student s[] = { {"Tom",80},{"Jack",70},
                    {"Jone",90},{"Tom",70},{"Alice",100} };
	
    MyMultimap<string,int> mp;
    for(int i = 0; i<5; ++ i)
        mp.insert(make_pair(s[i].name,s[i].score));
    Print(mp.begin(),mp.end()); //按姓名从大到小输出

    mp.Set("Tom",78); //把所有名为"Tom"的学生的成绩都设置为78
    Print(mp.begin(),mp.end());
	
	
	
    MyMultimap<int,string,less<int> > mp2;
    for(int i = 0; i<5; ++ i) 
        mp2.insert(make_pair(s[i].score,s[i].name));
	
    Print(mp2.begin(),mp2.end()); //按成绩从小到大输出
    mp2.Set(70,"Error");          //把所有成绩为70的学生，名字都改为"Error"
    Print(mp2.begin(),mp2.end());
    cout << "******" << endl;
	
    mp.clear();
	
    string name;
    string cmd;
    int score;		
    while(cin >> cmd ) {
        if( cmd == "A") {
            cin >> name >> score;
            if(mp.find(name) != mp.end() ) {
                cout << "erroe" << endl;
            }
            mp.insert(make_pair(name,score));
        }
        else if(cmd == "Q") {
            cin >> name;
            MyMultimap<string,int>::iterator p = mp.find(name);
            if( p!= mp.end()) {
                cout << p->second << endl;
            }
            else {
                cout << "Not Found" << endl; 
            }		
        }
    }
    return 0;
}

#include <iostream>

#include <string>

#include <map>

#include <iterator>

#include <algorithm>

using namespace std;

// 在此处补充你的代码

template <class T1, class T2, class T3 = greater<T1> >

class MyMultimap: public multimap<T1, T2, T3>{

public:

void Set(T1 a, T2 b){

for(auto it = this->find(a); it->first == a; it++)

it->second = b;

}

};

template <typename T1,typename T2>

ostream& operator <<(ostream& os, pair<T1, T2> p){

os << '(' << p.first << ',' << p.second << ')';

return os;

}

struct Student

{

string name;

int score;

};

template <class T>

void Print(T first,T last) {

for(;first!= last; ++ first)

cout << * first << ",";

cout << endl;

}

int main()

{

Student s[] = { {"Tom",80},{"Jack",70},

{"Jone",90},{"Tom",70},{"Alice",100} };

MyMultimap<string,int> mp;

for(int i = 0; i<5; ++ i)

mp.insert(make_pair(s[i].name,s[i].score));

Print(mp.begin(),mp.end()); //按姓名从大到小输出

mp.Set("Tom",78); //把所有名为"Tom"的学生的成绩都设置为78

Print(mp.begin(),mp.end());

MyMultimap<int,string,less<int> > mp2;

for(int i = 0; i<5; ++ i)

mp2.insert(make_pair(s[i].score,s[i].name));

Print(mp2.begin(),mp2.end()); //按成绩从小到大输出

mp2.Set(70,"Error"); //把所有成绩为70的学生，名字都改为"Error"

Print(mp2.begin(),mp2.end());

cout << "******" << endl;

mp.clear();

string name;

string cmd;

int score;

while(cin >> cmd ) {

if( cmd == "A") {

cin >> name >> score;

if(mp.find(name) != mp.end() ) {

cout << "erroe" << endl;

}

mp.insert(make_pair(name,score));

}

else if(cmd == "Q") {

cin >> name;

MyMultimap<string,int>::iterator p = mp.find(name);

if( p!= mp.end()) {

cout << p->second << endl;

}

else {

cout << "Not Found" << endl;

}

return 0;

}

6:编程填空：输出指定结果二

#include <iostream>
#include <map>
using namespace std;
class A{
public:
    static int count;
    int x;
    A(){
        count++;
    }
    virtual ~A(){
        puts("A::destructor");
        count--;
    }
    A(int _x):x(_x){
        count++;
    }    
};
class B: public A{
public:
    B(int _x):A(_x){
    }
    B(const B &a){        
    }
    ~B(){
        puts("B::destructor");
    }
};
int A::count = 0;
void func(B b) {  }
int main()
{
	A a1(5),a2;
	cout << A::count << endl;
	B b1(4);
	cout << A::count << endl;
	func(b1);
	cout << A::count << endl;
	A * pa = new B(4);
	cout << A::count << endl;
	delete pa;
	cout << A::count << endl;
	return 0;
}

#include <iostream>

#include <map>

using namespace std;

class A{

public:

static int count;

int x;

A(){

count++;

}

virtual ~A(){

puts("A::destructor");

count--;

}

A(int _x):x(_x){

count++;

}

};

class B: public A{

public:

B(int _x):A(_x){

}

B(const B &a){

}

~B(){

puts("B::destructor");

}

};

int A::count = 0;

void func(B b) { }

int main()

{

A a1(5),a2;

cout << A::count << endl;

B b1(4);

cout << A::count << endl;

func(b1);

cout << A::count << endl;

A * pa = new B(4);

cout << A::count << endl;

delete pa;

cout << A::count << endl;

return 0;

}

7:MyOstream_iterator

#include <iostream>
#include <vector>
#include <list>
using namespace std;
template <class T>
class MyOstream_iterator{
public:
    int p;
    int& operator*(){
        return p;
    }
    void operator++(int x){
        cout << p << ',';
    }
};
template <class T1, class T2>
void MyCopy(T1 l, T1 r, T2 f)
{
    while(l != r)
    {
        *f = *l;
        f++;
        l++;
    }
}
int main()
{
	int n;
	int a[100];
	while( cin >> n) {
		MyOstream_iterator<int> o;
		vector<int> v(n);
		for(int i = 0;i < n; ++i) 
			cin >> a[i];
		MyCopy(a,a+n,v.begin());
		MyCopy(a,a+n,v.begin());
		
		MyCopy(v.begin(),v.end(),o);
		cout << endl;
		list<int> ls(n);
		MyCopy(v.begin(),v.end(),ls.begin());
		MyCopy(v.begin(),v.end(),ls.begin());
		MyCopy(ls.begin(),ls.end(),o);
		cout << endl;
	}
	return 0;
}

#include <iostream>

#include <vector>

#include <list>

using namespace std;

template <class T>

class MyOstream_iterator{

public:

int p;

int& operator*(){

return p;

}

void operator++(int x){

cout << p << ',';

}

};

template <class T1, class T2>

void MyCopy(T1 l, T1 r, T2 f)

{

while(l != r)

{

*f = *l;

f++;

l++;

}

int main()

{

int n;

int a[100];

while( cin >> n) {

MyOstream_iterator<int> o;

vector<int> v(n);

for(int i = 0;i < n; ++i)

cin >> a[i];

MyCopy(a,a+n,v.begin());

MyCopy(v.begin(),v.end(),o);

cout << endl;

list<int> ls(n);

MyCopy(v.begin(),v.end(),ls.begin());

MyCopy(ls.begin(),ls.end(),o);

cout << endl;

}

return 0;

}

8:奇怪的输出

#include <iostream>
#include <string>
#include <cstdlib>
#include <cstring>
#include <cstdio>
using namespace std;

class A {
public:
    int v;
    A(int n):v(n) { }
    operator string(){
        string ans = "A:v=";
        ans += char(v + '0');
        return ans;
    }
    friend ostream& operator <<(ostream& os, A a){
        os << a.v;
        return os;
    }
};
int main()
{
    A a(5),b(6);
    cout << (string)a <<  endl;
    cout <<  b <<  endl;
    return 0;
}

#include <iostream>

#include <string>

#include <cstdlib>

#include <cstring>

#include <cstdio>

using namespace std;

class A {

public:

int v;

A(int n):v(n) { }

operator string(){

string ans = "A:v=";

ans += char(v + '0');

return ans;

}

friend ostream& operator <<(ostream& os, A a){

os << a.v;

return os;

}

};

int main()

{

A a(5),b(6);

cout << (string)a << endl;

cout << b << endl;

return 0;

}

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2016程序设计实习实验班免修考试(C++)

1:编程填空：计算数列平方和

2:编程填空：MyString

3:编程填空：字符串排序

4:编程填空：人群的排序和分类

5:编程填空：数据库内的学生信息

6:编程填空：输出指定结果二

7:MyOstream_iterator

8:奇怪的输出

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