// List.cpp : 定义控制台应用程序的入口点。
//


#include "stdio.h"
#include "string.h"
#define DataType int
#define MAXSIZE  100  //初始量

struct SList{
    char  name[20];
    char grade[20];                              
};
struct sum{
    struct SList record[MAXSIZE];
    int len;
};
struct sum InitSList()
{  //初始化线性表
    struct sum L;
    L.len=-1;
    return L;
}
int  InsertSList(struct sum &L,int i,char* x,char* y)
{  //在第i个元素之前插入一个新结点
    int j;
    if (L.len==MAXSIZE-1)
        return (-1);
    if (i<1||i>L.len+2)
        return (0);
    for (j=L.len;j>=i-1;j--)  
        L.record[j+1]=L.record[j];
    //    L.record[j+1].grade=L.record[j].grade;
       L.record[i-1].name= *x;
        L.record[i-1].grade= *y;
        L.len++;
    return 1;
}
int DeleteSList(struct sum &L,int i)
{  //删除第i个元素
    int j;
    if (L.len==-1)      
        return (-1);
    if (i<1||i>L.len+2)  
        return (0);
    for (j=i;j<=L.len;j++)  
        L.record[j-1]=L.record[j];
    L.len--;
    return 1;
}
void printSList(struct sum &L)
{
    printf("The elements in the SList are:\n");
    for(int i=0;i<=L.len;i++)
        printf("%s %s",L.record[i].name,L.record[i].grade);
    printf("\n");

}

int main()
{
    struct sum L=InitSList();
    printf("please input the name and grade of math into the L:\n");
    char tem[20], q[20];
    int p;
    scanf("%s %s",tem,q);
    while(strcmp(tem,"-1")==0)
    {
        InsertSList(L,L.len+2,tem,q);
        scanf("%s %s",tem,q);
    }
    printSList(L);

    printf("please input the name and grade and its position you want to  insert into the L:\n");
    scanf("%s %s %d",tem,q,&p);
    InsertSList(L,p,tem,q);
    printSList(L);


    printf("please input the element's position you want to  delete from the L:\n");
    scanf("%d",&p);
    DeleteSList(L,p);
    printSList(L);

    return 0;
}

问题解决了非常感谢你了