[C++] 厦大C语言上机 1425 字符串的增添

#include <stdio.h>
#include <string.h>
void add(char *s, int x, char q)
{
  int len_s = (int)strlen(s);
  int i;
  s[len_s + 1] = '\0';
  for (i = len_s; i >= 0; --i)
  {
    if (i == x)
    {
      s[i] = q;
      return;
    }
    s[i] = s[i-1];
  }
}
void delete(char *s, int x)
{
  int len_s = (int)strlen(s);
  int i;
  for (i = x; i < len_s - 1; ++i)
    s[i] = s[i+1];
  s[len_s - 1] = '\0';
}
int main()
{
  char s[2005] = { 0 };
  int n;
  char operator[10] = { 0 };
  int x;
  char q;
  scanf("%s", s);
  scanf("%d", &n);
  while (n--)
  {
    scanf("%s", operator);
    if (!strcmp(operator, "add"))
    {
      scanf("%d %c", &x, &q);
      add(s, x-1, q);
    }
    else
    {
      scanf("%d", &x);
      delete(s, x-1);
    }
  }
  printf("%s\n", s);
  return 0;
}