#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int o=0;
void menue()
{
  printf("*******welcome!!********");
  printf("===============================================================================\n");
  printf("                  1:input the strings \n");
  printf("                  2:sort the strings from the smallest to biggest\n");
  printf("                  3:Judge whether have huiwen strings\n");
  printf("                  4:close this program\n");
  printf("===============================================================================\n");
  printf("\n");
  printf(" please input the operator you want  : ");
}
int input(const int n,char *str[])
{
  int i;
  printf("please input the strings \n");
  for(i=0;i<n;++i)
   {
      printf("zhe shi di %d ge zi fu chuan          ",i);
      scanf("%s",str[i]);
   }
   printf(" you have inputed %d strings, do the next you want \n", i);
    return 0;
}
int sort(const int n,char *str[])
{
  int i,j;
  char *t;
  if(o==0)
  printf("You have not inputed any strings \n");
  else
 {
  for(i=0;i<n-1;++i)
    for(j=1;j<n;++j)
      {
        if(strcmp(str[i],str[j])>0)
          {
            t=str[i];
            str[i]=str[j];
            str[j]=t;
          }
      }
     printf(" the strings are sorted in the order, and they are \n");
    return 0;
}
int sort(const int n,char *str[])
{
  int i,j;
  char *t;
  if(o==0)
  printf("You have not inputed any strings \n");
  else
 {
  for(i=0;i<n-1;++i)
    for(j=1;j<n;++j)
      {
        if(strcmp(str[i],str[j])>0)
          {
            t=str[i];
            str[i]=str[j];
            str[j]=t;
          }
      }
     printf(" the strings are sorted in the order, and they are \n");
   for(i=0;i<n;++i)
    {
       puts(str[i]);
       printf("\n");
    }

  }
 return 0;
}
int  huiwen(const int n,char *str[])
{
   int i,t=1,num=0;
   if(o==0)
   printf("You have not inputed any strings \n");
   else
  {
   for(i=0;i<n;++i)
   {
     size_t len=strlen(str[i]);
      size_t j=0;
      for(j=0;j<len/2;++j)
      {if(str[i][j]!=str[i][len-j-1])
        t=0;
      }
if(t==1)
      {printf("%s is hui wen string\n",str[i]);
       num++;
      }
      t=1;
   }
   if(num==0)
   printf("there are no huiwen string inside \n");
  }
  return 0;
}
int main(void)
{
   int num,op,g;
   printf("how many strings you want to input \n");
   scanf("%d",&num);
   const int Num=num;
   char *str[Num];
   char p[Num][100000];
   for(g=0;g<Num;++g)
   {
     str[g]=p[g];
   }
   menue();
 while(1)
 {
   scanf("%d",&op);
    switch(op)
  {
     case 1:
     input(Num,str);
     o++;
     break;
     case 2:
     sort(Num,str);
     break;
     case 3:
     huiwen(Num,str);
     break;
     case 4:
     exit(0);
     break;
     default:
     printf("you input wrong opeartor \n");
     break;
   }
 }
  return 0;
}
这个是用C写的。