C++顺序链表

#include <iostream>
#include <cstdio>
using namespace std;
struct InitList
{
    char ch[20];
    int length;
};
int main()
{
    int i=0;
    InitList *L=new InitList;
    cout<<"请输入一段字符串：\n";
    while((L->ch[i]=getchar())&&(L->ch[i]!='\n'))
    {
        ++i;
    }
    L->length=i+1;
    cout<<"采用尾插法依次插入a,b,c,d,；\n";
    char a[5]={'a','b','c','d','e'};
    for(int n=0;n<5;++n)
    {
        L->ch[n+L->length-1]=a[n];
    }
    L->length+=5;
    cout<<"顺序链表L为：\n";
    for(int n=0;n<L->length;++n)
    {
        cout<<L->ch[n]<<' ';
    }
    cout<<endl;
    cout<<"顺序链表L长度为：";
    cout<<L->length<<endl;
    cout<<"在第4个元素上插入元素f；";
    for(int n=++L->length-1;n>3;n--)
    {
        L->ch[n]=L->ch[n-1];
    }
    L->ch[3]='f';
    cout<<"顺序链表L为：\n";
    for(int n=0;n<L->length;++n)
    {
        cout<<L->ch[n]<<' ';
    }
    cout<<endl;
    return 0;
}