[C++知识库]C++小白学习笔记（5）

1、简易学生信息库（结构体）

# include<iostream>
# include<iomanip>
using namespace std;
struct Student
{
	int num;
	float score;
	struct Student *next;//指向自己类型
};// ;容易掉

int main()
{
	struct Student a, b, c, *head, *p;//定义一个头指针和一个移动指针
	
	a.num = 1; 
	a.score = 90;
	b.num = 2; 
	b.score = 80;
	c.num = 3; 
	c.score = 70;
	
	head = &c;
//	a.next = &b;
//	b.next = &c;
	c.next = NULL;//最后一个学生指向空
	p = head;
	
	while(p!=NULL)//等价于while(p)
	{
		cout<<p->num<<"   "<<fixed<<setprecision(1)<<p->score<<endl;
		//printf("%ld%5.1f\n",p->num,p->score);//C
		p=p->next;
	}
	
	return 0;	
} 

2、简易学生信息库（类）

//简易学生信息库（类）
# include<iostream>
using namespace std;
# define MAX 10000

class student{
private:
	int num;
	char name[10];
	char sex;
	float Math;
	float Chinese;	
	float English;
public:
	void input();
	void sum();
	void aval();
};//;容易掉

void student::input(){
	cout<<"请输入学生学号：";
	cin>>num;
	cout<<"请输入学生姓名：";
	cin>>name;
	cout<<"请输入学生性别：";
	cin>>sex;	
	cout<<"请输入数学成绩：";
	cin>>Math;
	cout<<"请输入语文成绩：";
	cin>>Chinese;	
	cout<<"请输英语学成绩：";
	cin>>English;	
}

void student::sum(){
	float S = Math+ Chinese+ English;
	cout<<S<<endl;
}

void student::aval(){
	float S = Math+ Chinese+ English;
	cout<<S/3<<endl;
}

int main()
{	
	student liuyihan[MAX];
	for(int i = 1; i < MAX; i++)
	{	
		cout<<"请输入第"<<i<<"位学生的信息: "<<endl; 
		liuyihan[i].input();
		cout<<endl;	
		cout<<"该学生的总分是: ";
		liuyihan[i].sum();
		cout<<endl;
		cout<<"该学生的平均分是: ";
		liuyihan[i].aval();
		cout<<endl;
	}
	return 0;

}

3、简易职工信息库（类）

# include<iostream>
using namespace std;

class Employee{
	private:
		char name[10];
		char sex;
		int num;//工龄 
		
		float gongzi;
		float jingtie;
		float xiaoyi;
		
	public:
		void input();
		void sum1();
		void sum2();
		void sum3();
};

void Employee::input(){
	cout<<"请输入你的名字：" <<endl; 
	cin>>name;
	cout<<"请输入你的性别：" <<endl; 
	cin>>sex;
	cout<<"请输入你的工号：" <<endl; 
	cin>>num;
	cout<<"请输入你的基础工资：" <<endl; 	
	cin>>gongzi;
	cout<<"请输入你的岗位津贴：" <<endl; 
	cin>>jingtie;
	cout<<"请输入你的效应工资：" <<endl; 	
	cin>>xiaoyi;	
}
	
void Employee::sum1(){
	cout<<endl;
	cout<<"应付工资："<<endl;
	float a = gongzi +jingtie + xiaoyi;
	cout<<a<<endl; 
}	

void Employee::sum2(){
		cout<<endl;
	cout<<"个人所得税："<<endl;
	float a = gongzi +jingtie + xiaoyi;
	if(a <= 3500)
		cout<<0<<endl;
	else 
		cout<<(a - 3500)*0.03<<endl; 
}	

void Employee::sum3(){
	float b;
	cout<<endl;
	cout<<"实发工资："<<endl;
	float a = gongzi +jingtie + xiaoyi;
	if(a <= 3500)
		b = 0; 
	else 
		b = (a - 3500)*0.03; 
	cout<<b<<endl;
	
}	

int main()
{
	Employee liuyihan;
	liuyihan.input();
	liuyihan.sum1();
	liuyihan.sum2();
	liuyihan.sum3();
	
	return 0;
}

4、链表的创建和输出

# include<stdio.h>
# include<iostream>
# include<stdlib.h>//exit
using namespace std;

#define OK 1
#define ERRPR 0 
#define OVERFLOW -2

typedef int Status;
typedef int ElemType;

typedef struct LNode
{
	ElemType data;
	struct LNode *next;
}LNode, *LinkList;
//后插法创建单链表 
void CreateList_R(LinkList &L, int n)//引用 
{
	LinkList p, r;
	int i;
	L = new LNode;
	L->next = NULL;
	r = L;
	for(i = 0; i < n; ++i)
	{
		p = new LNode;//每一次循环都会生成一个新节点*p
		cin>>p->data;
		p->next = NULL; 
		r->next = p;
		r = p;  //p的地址赋给r；相当于让r坐p的凳子上
	}
}

void ShowList(LinkList L)
{
	LinkList p;
	p = L->next;
	while(p)
	{
		printf("%d\t", p->data);
		p = p->next;
	} 
	printf("\n");
}

int main()
{
	LinkList kk;
	int n;
	cin>>n;
	CreateList_R(kk, n);
	ShowList(kk);
	
	return 0;	
}