• C++试卷(程序设计题)


    • 单元综合测试一(1-5章)
      已有复数Complex类 ,编写一个类Root实现求解一元二次方程组的程序。

      #include 
      #include 
      #include 
      using namespace std;
      
      class Complex {
      public:
      	Complex() {}
      	void setC(double i, double j) { real = i; image = j; }
      	void show();
      protected:
      	double real, image;
      };
      void Complex::show() {
      	cout << "(" << real << "," << image << "i)" << endl;
      }
      
      class Root {
      public:
      	Root(double i, double j, double k) {
      		a = i; b = j; c = k;
      	}
      	void show();
      	void solve();
      	void solve2();
      protected:
      	double a, b, c;
      };
      
      void Root::show() {
      	cout << "方程 " << a << setiosflags(ios::showpos) << "*x*x" << b << "*x" << c << "=0 " << resetiosflags(ios::showpos) << "的解是:" << endl;
      }
      
      /*
      求根公式:x = (-b±√b²-4ac)/2a
      
      对于实数系一元二次方程 ax² + bx + c = 0(a≠0),△=b²-4ac称作一元二次方程组根的判别式.根据判别式,根有三种可能的情况:
      
      1.△=0 有两个相等的实根.这两个根为:
      	x1 = x2 = -b/2a
      
      2.△>0 有两个不相同的实根。如果系数都为有理数,且△是一个完全平方根,则两根都是有理数,否则为无理数.
      
      3.△<0 有两个不同的复数根,且为共轭复根。这时根为:
      	x1 = -b/2a + i((√b²-4ac)/2a)
      	x2 = -b/2a - i((√b²-4ac)/2a)
        其中 i² = -1.
      */
      void Root::solve() {
      	show();
      	double x = -b / 2 / a;
      	double dt = b * b - 4 * a * c;
      	Complex c1, c2;
      
      
      	if (dt == 0) {
      		c1.setC(x, 0);
      		c2.setC(x, 0);
      		cout << "\nx1=x2=";
      		c1.show();
      	}
      	else if (dt > 0) {
      		c1.setC(x + sqrt(dt) / (2 * a), 0);
      		c2.setC(x - sqrt(dt) / (2 * a), 0);
      		c1.show();
      		c2.show();
      	}
      	else {
      		c1.setC(x, sqrt(-dt) / (2 * a));
      		c2.setC(x, -sqrt(-dt) / (2 * a));
      		c1.show();
      		c2.show();
      	}
      }
      
      
      void Root::solve2() {
      	show();
      	double dt = b * b - 4 * a * c;
      	double x = -b / 2 / a;
      	if (dt == 0) {
      		cout << "x1=x2=" << x;
      	}
      	else if (dt > 0) {
      		cout << "x1=" << (-b + sqrt(dt)) / 2 / a << endl;
      		cout << "x2=" << (-b - sqrt(dt)) / 2 / a << endl;
      	}
      	else {
      		Complex c1, c2;
      		c1.setC(x, sqrt(-dt) / 2 / a);
      		c2.setC(x, -sqrt(-dt) / 2 / a);
      		cout << "x1=";
      		c1.show();
      		cout << "x2=";
      		c2.show();
      	}
      }
      int main()
      {
      	double a, b, c;
      	cout << "\n输入一元二次方程组的系数a,b,c:";
      	cin >> a >> b >> c;
      	Root root(a, b, c);
      	root.solve();
      	return 0;
      }
      
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    • 单元综合测试二(6-9章)
      定义堆栈类模板Stack(先进后出),栈的大小由使用者决定。要求该类提供如下两种操作:1.push入栈。2.pop出栈,用数组来实现。

      #include   
      using namespace std;
      
      template <class T, int size>
      
      class Stack {
      	T x[size];
      	int current;
      public:
      	Stack() {
      		current = 0;
      	}
      	void push(T);
      	void pop(T);
      
      };
      
      
      template<class T, int size>
      void Stack<T, size>::push(T t) {
      	if (current == size) {
      		cout << "The Stack is full!" << endl;
      		exit(0);
      	}
      	else {
      		x[current] = 1;
      		current++;
      	}
      }
      
      template<class T, int size>
      void Stack<T, size>::pop(T t) {
      	if (current == 0) {
      		cout << "The Stack no object in the Stack!" << endl;
      		exit(0);
      	}
      	else {
      		T a = x[current - 1];
      		current--;
      		return a;
      	}
      }
      
      int main() {
      
      	return 0;
      }
      
      
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    • 全真模拟演练一
      复数类Complex,私有成员变量实部real,虚部image。添加构造函数,并使用友元函数add实现复数加法。

      #include   
      using namespace std;
      class Complex {
      private:
      	double real, image;
      public:
      	Complex() {}
      	Complex(double a, double b) {
      		real = a;
      		image = b;
      	}
      	void setRI(double a, double b) {
      		real = a;
      		image = b;
      	}
      	double getReal() {
      		return real;
      	}
      	double getImage() {
      		return image;
      	}
      	void print() {
      		if (image > 0) {
      			cout << "复数:" << real << "+" << image << "i" << endl;
      		}
      		if (image < 0) {
      			cout << "复数:" << real << "-" << image << "i" << endl;
      		}
      	}
      	friend Complex add(Complex, Complex);
      };
      
      Complex add(Complex c1, Complex c2) {
      	return Complex(c1.real + c2.real, c1.image + c2.image);
      }
      int main() {
      	Complex c1(19, 0.864), c2,c3;
      	c2.setRI(90, 125.012);
      	c3 = add(c1, c2);
      	cout << "复数1:"; c1.print();
      	cout << "复数2:"; c2.print();
      	cout << "复数3:"; c3.print();
      	return 0;
      }
      
      
      
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    • 全真模拟演练二
      编写一个函数to_lower,实现将字符串大写转小写

      #include   
      #include   
      using namespace std;
      
      int main() {
      	void to_lower(char a[]);
      	char str[10];
      	cin >> str;
      	to_lower(str);
      	cout << str << endl;
      
      	/*
      	void to_uper(char a[]);
      	char str2[10] = { 'a','b','c','d' };
      	to_uper(str2);
      	cout << str2 << endl;
      	*/
      }
      void to_lower(char a[]) {
      	for (int i = 0; i < 10; i++) {
      		if (a[i] >= 'A' && a[i] <= 'Z') {
      			a[i] += 32;
      		}
      	}
      }
      /*
      void to_uper(char a[]) {
      	for (int i = 0; i < 10 && a[i] != '\0'; i++) {
      		if (a[i] >= 'a' && a[i] <= 'z') {
      			a[i] -= 32;
      		}
      	}
      }
      */
      
      	
      
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    • 全真模拟演练三
      输入10个数,写一个求平均值的函数,并输出结果.

      #include  
      #include
      using namespace std;
      
      void main() {
      	float average(float a[]);
      	float score[10];
      	for (int i = 0; i < 10; i++)
      		cin >> score[i];
      	cout << average(score) << endl;
      }
      
      float average(float a[]) {
      	float sum = 0;
      	for (int i = 0; i < 10; i++)
      		sum += a[i];
      	return (sum / 10);
      }
      
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    • 全真模拟演练四
      在字符串类str中实现一个判断函数,该函数的功能是统计某一字符串类对象(仅单词和空格组成)单词数量,同时保存所有单词在字符串中的起始地址(设改字符串不超过100个单词)

      #include  
      #include
      using namespace std;
      class str {
      
      public:
      	string s;
      	int n, a[100], j, l;
      	str(string& a) {
      		s = a;
      		n = 0;
      		j = 0;
      		l = 0;
      	}
      	int test(str ms);
      	int* geta() { return a; }
      };
      
      int test(str ms) {
      	while (ms.l < ms.s.length()) {
      		if (ms.s[ms.l] != '\0') {
      			if (ms.j == 0) {
      				ms.a[ms.n] = ms.l;
      				ms.j = 1;
      				ms.n++;
      			}
      		}
      		else {
      			if (ms.j == 1) {
      				ms.j = 0;
      			}
      		}
      		ms.l++;
      	}
      	return ms.n;
      }
      int  main() { 
      	return 0;
      }
      
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    • 全真模拟演练五
      定义一个抽象类Shape,由它派生三个类,Square(正方形),Trapezoid(梯形),Triangle(三角形),用虚函数分别计算几种图形面积,并求它们的和。要求用基类指针数组,使它每一个元素指向一个派生类对象。

      #include   
      using namespace std;
      
      class Shape {
      public:
      	virtual double area()const = 0;
      };
      
      class Square :public Shape {
      public:
      	Square(double s) :side(s) {}
      	double area() const { return side * side; }
      private:
      	double side;
      };
      
      class Trapezoid :public Shape {
      public:
      	Trapezoid(double i, double j, double k) :a(i), b(j), h(k) {}
      	double area() const { return (a + b) * h / 2; }
      private:
      	double a, b, h;
      };
      
      
      class Triangle :public Shape {
      public:
      	Triangle(double i, double j) :w(i), h(j) {}
      	double area() const { return w * h / 2; }
      private:
      	double w, h;
      };
      
      void  main() {
      	Shape* p[3];
      	Square se(5);
      	Trapezoid td(2, 5, 4);
      	Triangle te(5, 8);
      	p[0] = &se;
      	p[1] = &td;
      	p[2] = &te;
      	double da = 0;
      	for (int i = 0; i < 3; i++) {
      		da += p[i]->area();
      	}
      	cout << da << endl;
      }
      
      
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    • 全真模拟演练六
      编写一个类模板void change(T &i,T &j),实现整型、实数、字符串的交换。并编写测试主函数。

      #include   
      using namespace std;
      template <class T>
      
      void change(T& i, T& j) {
      	T temp;
      	temp = i;
      	i = j;
      	j = temp;
      }
      
      int  main() {
      
      	int a, b;
      	cout << "输入两个整数a,b:";
      	cin >> a >> b;
      	change(a, b);
      	cout << "交换后为a,b:" << a << " " << b << endl;
      
      	double c, d;
      	cout << "\n输入两个实数c,d:";
      	cin >> c >> d;
      	change(c, d);
      	cout << "交换后为c,d:" << c << " " << d << endl;
      
      	cin.get();
      	char* s1, * s2;
      	char str1[20], str2[20];
      	s1 = str1; s2 = str2; 
      	cout << "\n输入第一个字符串s1:"; 
      	cin.getline(s1, 20); 
      	cout << "输入第二个字符串s2:";
      	cin.getline(s2, 20);
      
      	change(s1, s2);
      	cout << "交换后的为s1,s2:" << s1 << " \t" << s2 << endl;
      	return 0;
      }
      
      
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    • 考前深度密押(一)

      定义一个图形类figure,其中有保护成员:高度(height),宽度(width),和一个公有的构造函数。该图形派生类有矩形类和等腰三角形类。每个派生类中包含一个函数 area() 用来计算面积。

      #include    
      using namespace std;
      
      class figure {
      protected:
      	double height, width;
      public:
      	figure(double h = 0, double w = 0) :height(h), width(w) {}
      };
      
      class triangle :public figure {
      protected:
      	double height, width;
      public:
      	triangle(double h = 0, double w = 0) :height(h), width(w), figure(w, h) { }
      	double area() {
      		return height * width / 2;
      	}
      };
      
      class rectangle :public figure {
      protected:
      	double height, width;
      public:
      	rectangle(double h = 0, double w = 0) :height(h), width(w), figure(w, h) { }
      	double area() {
      		return height * width;
      	}
      };
      
      void main() {
      	triangle tri(2, 3);
      	rectangle rec(2, 3);
      	cout << tri.area() << endl;
      	cout << rec.area() << endl;
      } 
      
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    • 考前深度密押(二)
      定义一个生日类,成员变量有年、月、日。定义一个人员类,成员变量有姓名,性别,生日。
      人员类中的生日是生日类的对象,两个类都有构造函数和显示函数。在主函数中声明一个人员类对象,显示数据。

      #include   
      #include   
      using namespace std;
      
      class birth {
      private:
      	int year, month, day;
      public:
      	birth(int y, int m, int d) :year(y), month(m), day(d) {}
      	void show() {
      		cout << year << "/" << month << "/" << day << endl;
      	}
      };
      
      class person {
      private:
      	char name[10];
      	char sex[10];
      	birth birdy;
      public:
      	person(const char* p, const char* q, int y, int m, int d) :birdy(y, m, d) {
      		strcpy_s(name, strlen(p) + 1, p);
      		strcpy_s(sex, strlen(q) + 1, q);
      	}
      	void show() {
      		cout << name << " " << sex << " ";
      		birdy.show();
      	}
      };
      
      void main() {
      	person pe("Tom", "男", 1994, 11, 16);
      	pe.show();
      } 
      
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    • 2020

      1.编写一个函数模板,实现将n个数据进行由小到大排序.

      #include   
      using namespace std;
      template<class T>
      void Sort(T a[], int n) {
      	for (int i = 1; i < n; i++)
      		for (int j = 0; j < n - i; j++)
      			if (a[j] > a[j + 1]) {
      				T temp;
      				temp = a[j];
      				a[j] = a[j + 1];
      				a[j + 1] = temp;
      			}
      };
      void  main() {
      	int a[5] = { 10,-1,1,3,0 };
      	Sort(a, 5);
      	for (int i = 0; i < 5; i++)
      		cout << a[i] << " "; 
      }
      
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      2.现有学校School类,保护成员Number(编号),Name(姓名)。它的派生类学生Student,数据成员Class_Num(班号),Total(总成绩),用成员函数Display()实现 学生张三,编号2020150601,班级四班,总成绩678 的输出,要求编写派生类的构造函数。

      #include   
      using namespace std;
      
      class School {
      public:
      	School(int nu, const char* s) :Number(nu) {
      		strcpy_s(Name, strlen(s) + 1, s);
      	}
      protected:
      	int Number;
      	char Name[10];
      };
      
      class Student :public School {
      public:
      	Student(int nu, const char* na, const char* cn, double t) :Total(t), School(nu, na) {
      		strcpy_s(Class_Num, strlen(cn) + 1, cn); 
      	}
      	void Display() {
      		cout << Number << " " << Name << " " << Class_Num << " " << Total << endl;
      	}
      protected:
      	char Class_Num[10];
      	double Total;
      };
      
      int  main() {
      	Student stu(2020150601, "张三", "四班", 678);
      	stu.Display();
      	return 0;
      }
      
      
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      dev c++

      #include   
      #include   
      using namespace std;
      
      class School {
      public:
      	School(int nu = 0, const char* s = "") {
      		Number = nu;
      		strcpy(Name, s);
      	}
      protected:
      	int Number;
      	char Name[10];
      };
      
      class Student :public School {
      public:
      	Student(int nu = 0, const char* na = "", const char* cn = "", double t = 0) :School(nu, na) {
      		strcpy(Class_Num, cn);
      		Total = t;
      	}
      	void Display() {
      		cout << Number << " " << Name << " " << Class_Num << " " << Total << endl;
      	}
      protected:
      	char Class_Num[10];
      	double Total;
      };
      
      int  main() {
      	Student stu(2020150601, "张三", "四班", 678);
      	stu.Display();
      	return 0;
      }
      
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    • 2021
      1.从键盘输入学号,姓名,成绩,存入score.txt,学号10字节,姓名20字节,成绩整型.

      #include   
      #include   
      using namespace std;
      
      int main() {
      	char number[10], name[20];
      	int score; 
      	ofstream outf("score.txt", ios::out);
      	if (!outf) {
      		cout << "打开文件失败";
      		return 0;	
      	}
      	cout << "输入学号,姓名,成绩:\n";
      	while(cin >> number >> name >> score)
      		outf << number << " " << name << " " << score<<endl;
      	outf.close();
      	return 0;
      }
      
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      2.创建Employee类,保护数据成员:姓名,街道地址,市,省,邮政编码;函数:构造函数,ChangeName函数改变姓名,Display函数打印完整数据 ,定义在类外.

      #include   
      using namespace std;
      
      class Employee {
      protected:
      	char name[10], address[50], city[10], province[10];
      	int code;
      public:
      	Employee(const char*, const char*, const char*, const char*, int cd);
      	void ChangeName(const char*);
      	void Display();
      };
      
      Employee::Employee(const char* n, const char* ad, const char* ct, const char* pve, int cd = 0) :code(cd) {
      	strcpy_s(name, strlen(n) + 1, n);
      	strcpy_s(address, strlen(ad) + 1, ad);
      	strcpy_s(city, strlen(ct) + 1, ct);
      	strcpy_s(province, strlen(pve) + 1, pve);
      
      }
      
      void Employee::ChangeName(const char* n) {
      	strcpy_s(name, strlen(n) + 1, n);
      }
      
      void Employee::Display() {
      	cout << name << " " << province << " " << city << " " << address << " " << code << endl;
      }
      
      int main() {
      	Employee emp("张三", "某某区某街道某号", "长沙市", "湖南省", 435600);
      	emp.Display();
      	return 0;
      }
      
      
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      dev c++

      #include   
      #include   
      using namespace std;
      
      class Employee {
      protected:
      	char name[10], address[50], city[10], province[10];
      	int code;
      public:
      	Employee(const char*, const char*, const char*, const char*, int cd);
      	void ChangeName(const char*);
      	void Display();
      };
      
      Employee::Employee(const char* n = "", const char* ad = "", const char* ct = "", const char* pve = "", int cd = 0) {
      	strcpy(name, n);
      	strcpy(address, ad);
      	strcpy(city, ct);
      	strcpy(province, pve);
      	code = cd;
      }
      
      void Employee::ChangeName(const char* n) {
      	strcpy(name, n); 
      }
      
      void Employee::Display() {
      	cout << name << " " << province << " " << city << " " << address << " " << code << endl;
      }
      
      int main() {
      	Employee emp("张三", "某某区某街道某号", "长沙市", "湖南省", 435600);
      	emp.Display();
      	return 0;
      }
      
      
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  • 原文地址:https://blog.csdn.net/qq_39251267/article/details/127287129