3.3编写各个功能的函数实体

3.3.1添加学生成绩记录add_record()

建立一个链表： bool stuscore::add_record() { int i; int j=1; string Name; string Number; char Sex; double Chengji;

student *newnode,*current,*previous; current=previous=head; cout<<"请输入插入的位置:"; cin>>i;

if(i<=0||i>length()+1) {

cout<<"输入的位置不正确!"; return false; }

cout<<"请输入学号:"; cin>>Number; cout<<"请输入姓名:"; cin>>Name;

cout<<"请输入性别:"; cin>>Sex;

cout<<"请输入成绩:";