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cpp课后代码部分

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清华大学郑莉第五版cpp课后代码部分

第二章

2-10

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#include<iostream>
using namespace std;
int main() {
	//for循环
	int n = 100;
	for (; n <= 200; n += 2);

	//while循环
	int n = 100;
	while (n <= 200)
		n += 2;

	//do while循环
	int n = 100;
	do {
		n += 2;
	} while (n <= 200);
}

2-15

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#include<iostream>
using namespace std;
int main() {
	int a;
	cout << "请输入一个数字：";
	cin >>a;
	cout << "输入的数字是：" << a;
}

2-16

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#include<iostream>
using namespace std;
int main() {
	cout << "int:" << sizeof(int) << endl;
	cout << "int:" << sizeof(long) << endl;
	cout << "int:" << sizeof(short) << endl;
	cout << "int:" << sizeof(float) << endl;
	cout << "int:" << sizeof(double) << endl;
	return 0;
}

2-17

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#include<iostream>
using namespace std;
int main() {
	for (int i = 32; i <= 127; i++) {
		cout << char(i) << endl;
		//第二种方法
		//cout << (char)i << endl;
	}
	return 0;
}

2-18

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#include<iostream>
using namespace std;
int main() {
	unsigned int x;
	unsigned int y = 100;
	unsigned int z = 50;
	x = y - z;
	cout << "Difference is: " << x;
	x = z - y;
	cout << "\nNow difference is: " << x << endl;

	return 0;
}

第二部分产生下溢，变成2^32-50

2-24

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#include<iostream>
using namespace std;
int main() {
	while (1) {
		char a;
		cout << "现在下雨吗(Y or N):";
		cin >> a;
		if (a == 'Y') {
			cout << "正在下雨" << endl;
			break;
		}
		else if (a == 'N') {
			cout << "现在没有下雨" << endl;
			break;
		}
		else
			continue;
	}

	return 0;
}

2-25

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#include<iostream>
using namespace std;
int main() {
	cout << "你考了多少分：";
	int grade;
	cin >> grade;
	if (grade >= 90 && grade <= 100)
		cout << "优";
	else if(grade >= 80 && grade <90)
		cout << "良";
	else if (grade >= 60 && grade <80)
		cout << "中";
	else if (grade >= 0 && grade <100)
		cout << "差";
}

2-26

switch语句

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#include<iostream>
using namespace std;
int main() {
	cout << "Menu: A(dd) D(elete) S(ort) Q(uit)， Select one:";
	char a;
	cin >> a;
	switch (a) {
		case 'A':
			cout << "数据已经增加. " << endl;
			break;
		case 'D':
			cout << "数据已经删除. " << endl;
			break;
		case 'S':
			cout << "数据已经排序. " << endl;
			break;
		case 'Q':
			return 0;
		default:
			break;
	}
	return 0;
}

2-27

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#include<iostream>
using namespace std;
int main() {

	for (int n = 2; n <= 100; n++) {
		int j = 2;
		for (; j < n; j++) {
			if (n % j == 0)
				break;
		}
		if(j==n)
			cout << n<<endl;
	}
	return 0;
}

2-29

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#include<iostream>
using namespace std;
int main() {
	int a = 26;
	while (1) {
		int b;
		cin >> b;
		if (b > a)
			cout << "猜大了" << endl;
		else if (b < a)
			cout << "猜小了" << endl;
		else {
			cout << "猜对了";
			break;
		}
	}
}

2-31

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#include<iostream>
using namespace std;
int main() {
	for (int i = 1; i <= 9; i++) {
		for (int j = 1; j <= i; j++) {
			cout << j << "*" << i << "=" << i * j << " ";
		}
		cout << endl;
	}
}

第三章

课前

例3-2

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//八位二进制转化成十进制
#include<iostream>
using namespace std;

double calculate(double x, int n);
int main() {
	int count = 0;
	cout << "输入对应二进制：";
	for (int i = 0; i < 8; i++) {
		char temp;
		cin >> temp;
		if (temp == '1')
			count += static_cast<int>(calculate(2, 7 - i));
	}
	cout << count;
}

double calculate(double x, int n) {
	double value=1;
	for (int i = 1; i <= n; i++) {
		value *= x;
	}
	return value;
}

例3-3

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//计算pai值
#include<iostream>
using namespace std;

double arctan(double x);

int main() {
	double m = 1.0 / 5.0;
	double n = 1.0 / 239.0;
	cout << 16 * arctan(m) - 4 * arctan(n);

	return 0;
}

double arctan(double x) {
	double count = 0;
	double temp = x;
	int i=1,j = 1;
	while (temp/i > 1e-15) {
		if (j%2 == 1) {
			count += temp/i;
			j++;
		}
		else {
			count -= temp/i;
			j++;
		}
		temp = temp * x * x;
		i += 2;
	}
	return count;
}

例3-4

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//回文数判断
#include<iostream>
using namespace std;
bool symm(int n);
int main() {
	for (int i = 11; i <= 999; i++) {
		if (symm(i) && symm(i * i) && symm(i * i * i))
			cout << i << endl;
	}
	return 0;
}
bool symm(int n) {
	int temp = n;
	int head = 0;
	int tail = 0;
	int fake_n = 0;
	while (n) {
		fake_n =fake_n*10+ n % 10;
		n /= 10;
	}
	if (fake_n == temp)
		return 1;
	else
		return 0;
}

课后

3-7

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//无符号除法
#include<iostream>
using namespace std;
int calculate(unsigned short int x, unsigned short int y);
int main() {
	unsigned short int x, y;
	cin >> x >> y;
	cout<<calculate(x, y);
	return 0;
}
int calculate(unsigned short int x, unsigned short int y) {
	if (y == 0)
		return -1;
	else
		return x / y;
}

3-8

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//温度转换
#include<iostream>
using namespace std;
int main() {
	cout << "输入华氏温度：";
	int F;
	cin >> F;
	cout << 5.0 / 9 * (F - 32);

	return 0;
}

3-9

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//质数判断
#include<iostream>
using namespace std;
int main() {
	cout << "输入一个数：";
	int a;
	cin >> a;
	int i = 2;
	for (; i < a; i++) {
		if (a % i == 0)
			break;
	}
	if (i == a)
		cout << a << "是质数" << endl;
	else {
		cout << a << "不是质数" << endl;
	}

	return 0;
}

3-10

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//最大公因数，最小公倍数
#include<iostream>
using namespace std;
int main() {
	int a;
	int b;
	cout << "请输入第一个值：";
	cin >> a;
	cout << "请输入第二个值：";
	cin >> b;
	int temp = a > b ? a : b;
	for (; temp >= 1; temp--) {
		if ((a % temp == 0) && (b % temp == 0)) {
			cout << a << "与" << b << "最大公因数是：" << temp << endl;
			cout << a << "与" << b << "最小公倍数是：" << a * b / temp;
			break;
		}
	}
	return 0;
}

3-12

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//基础递归
#include<iostream>
using namespace std;

int Recusion(int n);
int main() {
	cout << "请输入一个值：";
	int a;
	cin >> a;
	cout << a + Recusion(a - 1);
	return 0;
}

int Recusion(int n) {
	if (n < 1)
		return 0;
	else
		return n + Recusion(n - 1);
}

3-13

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//斐波那契数列
#include<iostream>
using namespace std;

int Recusion(int n);
int main() {
	cout << "请输入一个值：";
	int a;
	cin >> a;
	cout <<Recusion(a - 1)+ Recusion(a-2);
	return 0;
}

int Recusion(int n) {
	if (n ==1||n==2)
		return 1;
	else
		return Recusion(n - 1)+ Recusion(n-2);
}

3-14

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//勒让德多项式
#include<iostream>
using namespace std;
float Recusion(float x, float n);
int main() {
	cout << "输入正整数n：";
	float n;
	cin >> n;
	cout << "输入正整数x：";
	float x;
	cin >> x;
	if (n == 0)
		cout << 1;
	else if (n == 1)
		cout << x;
	else
		cout << ((2 * n - 1) * x * Recusion(x, n - 1) - (n - 1) * Recusion(x, n - 2)) / n;
	return 0;
}
float Recusion(float x, float n) {
	if(n==0)
		return 1;
	else if (n == 1)
		return x;
	else
		return ((2 * n - 1) * x * Recusion(x, n - 1) - (n - 1) * Recusion(x, n - 2)) / n;
}

3-15

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//函数重载，递归实现指数计算
#include<iostream>
using namespace std;

int getPower(int x, int y);
double getPower(double x, int y);
int main() {
	int a, m;
	double b;
	cout << "请输入整数a：";
	cin >> a;
	cout << "请输入实数b：";
	cin >> b;
	cout << "请输入整数m：";
	cin >> m;
	cout << "整数结果：" << getPower(a, m) << endl;
	cout << "实数结果：" << getPower(b, m) << endl;
	return 0;
}

int getPower(int x, int y) {
	int temp = 1;
	if (y < 0)
		return 0;
	else if (y == 1)
		return x;
	else {
		return x * getPower(x, y - 1);
	}
}
double getPower(double x, int y) {
	double temp = 1;
	if (y < 0)
		return 0;
	else if (y == 1)
		return x;
	else {
		return x * getPower(x, y - 1);
	}
}

第四章

课后

4-9

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#include<iostream>

class Rectangle {
private:
	//横轴与纵轴坐标
	int x;
	int y;
public:
	Rectangle(int x, int y);
	//计算面积
	void calculate(Rectangle a, Rectangle b);
};

Rectangle::Rectangle(int x, int y) :x(x), y(y) {}

void Rectangle::calculate(Rectangle a, Rectangle b) {
	std::cout << "面积是：" << abs((a.x - b.x) * (a.y - b.y)) << std::endl;
}

int main() {
	Rectangle A(5, 10);
	Rectangle B(6, 18);
	A.calculate(A, B);
	return 0;
}

4-10

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//粗糙版
#include<iostream>
#include<string>
class Date {
private:
	int year;
	int month;
	int day;
public:
	Date() {}
	Date(int year,int month,int day);
	~Date(){}
	std::string showd()const;
};

Date::Date(int year,int month,int day):year(year),month(month),day(day){}
std::string Date::showd()const{
	return std::to_string(year) + "-" +
		std::to_string(month) + "-" +
		std::to_string(day);
}
class People {
private:
	int number;
	Date d;
	int id;
public:
	enum sex { 男, 女 }s;
	People(){}
	//构造函数,隐式内联函数
	People(int number, sex s, Date d, int id) :number(number), s(s), d(d), id(id) {}
	~People();
	//拷贝构造函数
	People(const People& p);
	//人员信息录入
	void record();
	//人员信息显式
	void show();
};
People::People(const People& p) {
	this->number = p.number;
	this->s = p.s;
	this->d = p.d;
	this->id = p.id;
}
People::~People() {
	std::cout << number << "已经录入" << std::endl;
}
void People::record() {
	int y, m, day;
	int sexInput;
	std::cout << "输入编号：";
	std::cin >> number;
	std::cout << std::endl;

	std::cout << "输入性别：";
	std::cin >> sexInput;
	s = (sexInput == 0) ? 女 : 男;
	std::cout << std::endl;

	std::cout << "输入出生日期：";
	std::cin >> y >> m >> day;
	d = Date(y, m, day);
	std::cout << std::endl;

	std::cout << "输入id：";
	std::cin >> id;
	std::cout << std::endl;
}
void People::show() {
	std::cout << "编号：" << number <<std::endl<< "性别：" <<(s == 男 ? "男" : "女") <<std::endl<< "出生日期："<< d.showd() <<std::endl<< "id：" << id << std::endl;
}
int main() {
	People p;
	p.record();
	p.show();
	return 0;
}