#include <stdio.h>
#define maxsize 100
int list[maxsize];
int n;
/*insert in a seqlist*/
int sq_insert(int list[],int *p_n,int i,int x)
{
  int j;
  if(i<0||i>*p_n)
  return 1;
  if(*p_n>=maxsize)
  return 2;
  for(j=*p_n;j>=i;j--)
  list[j+1]=list[j];
  list[i]=x;
  (*p_n)++;
  return 0;
}

/*delete in a seqlist*/
int sq_delete( int list[],int *p_n,int i)
{
  int j;
  if(i<0||i>*p_n)
  return 1;
  for(j=i+1;j<=*p_n;j++)
  list[j-1]=list[j];
  (*p_n)-- ;
  return 0;
}



void main()
{
  int i,x,temp;
  printf("please input the number for n\n");
  printf("n=");
  scanf("%d",&n);
  for(i=0;i<=n;i++)
  {
    printf("list[%d]=",i);
    scanf("%d",&list[i]);
  }
  printf("the list before insertion is\n");
  for (i=0;i<=n;i++)
  printf("%d",list[i]);
  printf("\n");
  printf("please input the position where you want to insert a value\n position=");
  scanf("%d",&i);
  printf("please input the value you want to insert.\n x=");
  scanf("%d",&x);
  temp=sq_insert(list, &n, i, x);
  switch(temp)
  {
    case 0:printf("the insertion is  successful!\n");
           printf("the list after insertion is\n");
           for(i=0;i<=n;i++)
           printf("%d",list[i]);
           printf("\n");
           printf("the list's length is %d",n);
           break;
    case 1:
    case 2:printf("the insertion is not successful!\n");
           break;
   }
  temp=sq_delete( list,&n, i);
  switch(temp)
  {
    case 0:printf("the deletion is successful!\n");
           printf("the list after deletion is\n");
           for(i=0;i<=n;i++)
           printf("%d",list[i]);
           printf("the list's length is %d",n);
           break;
    case 1:printf("the deletion is not successful!\n");
           break;
  }
}

运行时，输入数组，长度和插入的数后，就结束了。这是怎么回事？

我发现了，是我的编译器有问题。不过删除操作那里的i确实有点问题，应该增加一个scanf("%d",&i).否则删除操作的时候，i永远为n+1。