学生成绩（链表）

淡淡的烟草味﹌ 2022-06-06 21:19 137阅读 0赞

#include<iostream>
    #include<string>
    using namespace std;
    struct Student{
    	string name;
    	string score;
    	Student *next;//定义了指向Candidate类型变量的指针
    };
    Student * Create(Student * head){
    	Student *p=NULL;
    	Student *node=NULL;
    	int n;//
    	cout<<"请输入学生的总数：";
    	cin>>n;
    	for(int i=1;i<=n;i++){
    		node=new Student;
    		cout<<"请输入第"<<i<<"个同学的姓名:";
    		cin>>node->name;
    		cout<<"请输入第"<<i<<"个同学的成绩:";
    		cin>>node->score;
    		if(head==NULL)
    			head=node;
    		else
    			p->next=node;
    		p=node;
    		if(i==n){
    			p->next=NULL;
    		}
    	}
    	return head;
    }
    void Print(Student * head){
    	Student *p=NULL;
    	p=head;
    	cout<<"链表已经建立!"<<endl;
    	cout<<"\n==========下面输入刚才的数据=============\n"<<endl;
    	int i=1;
    	while(p!=NULL){
    		cout<<"第"<<i<<"个同学==="<<p->name<<"==成绩===="<<p->score<<endl;
    		p=p->next;
    		i++;
    	}
    	cout<<"\n"<<endl;
    }
    void Insert(Student * head,int k){
    	Student *p=NULL;
    	Student *node=NULL;
    	p=head;
    	if(k==1){
    		node=new Student;
    		cout<<"第1位同学的名字：";
    		cin>>node->name;
    		cout<<"第1位同学的成绩：";
    		cin>>node->score;
    		node->next=head->next;
    		head=node;
    	}
    	int i=1;
    	while(p!=NULL){
    		if(i+1==k){
    			node=new Student;
    			cout<<"第"<<k<<"位同学的名字：";
    			cin>>node->name;
    			cout<<"第"<<k<<"位同学的成绩：";
    			cin>>node->score;
    			node->next=p->next;
    			p->next=node;
    		}
    		p=p->next;
    		i++;
    	}
    }
    
    void Destory(Student * head){
    	Student *d;
    	Student *p=NULL;
    	p=head;
    	while(p!=NULL){
    		d=p;
    		p=p->next;
    		delete d;
    	}
    }
    void Alter(Student * head,int k){
    	int i=1;
    	Student *p=head;
    	while(p!=NULL){
    		if(i==k){
    			cout<<"第"<<k<<"位同学的名字：";
    			cin>>p->name;
    			cout<<"第"<<k<<"位同学的成绩：";
    			cin>>p->score;
    		}
    		p=p->next;
    		i++;
    	}
    }
    Student * Delete(Student * head,int k){
    	int i=1;
    	Student *p=head;
    	Student *d=head;
    	if(k==1){
    		head=head->next;
    	}else{
    		while(p!=NULL){
    			if(i+1==k){
    				p->next=p->next->next;
    			}
    			p=p->next;
    			i++;
    		}
    	}
    	return head;
    }
    int main(){
    	Student *head=NULL;
    	//创建链表
    	head=Create(head);
    	//输出链表
    	Print(head);
    	//插入数据
    	int k;
    	cout<<"请输入你要插入的同学的序号：";
    	cin>>k;
    	Insert(head,k);
    	//输出链表
    	Print(head);
    	//修改链表
    	cout<<"请输入你要修改的同学的序号:";
    	cin>>k;
    	Alter(head,k);
    	//输出链表
    	Print(head);
    	//删除其中的一个项
    	cout<<"请输入你要删除的同学的序号:";
    	cin>>k;
    	head=Delete(head,k); 
    	//输出链表
    	Print(head);
    	//销毁链表
    	Destory(head);
    	return 0;
    }

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