輸入兩個字符串，從第一字符串中刪除第二個字符串中所有的字符。

在字符串中刪除特定的字符

輸入”They are students.” 和”aeiou”則刪除之后第一個字符串變成　Ｔhy r stdnts。

本題還用到了 “字符串hash”


#include <iostream>
#include <cstring>

char * string_del_characters( char * const src, const char * const dest )
{
   int destLen = strlen( dest );
   int hash_table[256] = { 0 };
   char * p = src;
   int index = 0;
   for( int i = 0; i < destLen; i++ )
   {
      hash_table[ (int)dest[i] ] = 1;
   }
   while( *p != '\0' )
   {
      if( 0 == hash_table[(int)*p] )
      {
         src[index++] = *p;
      }
      p++;
   }
   src[index] = '\0';
   return src;
}

int main( int argc, char ** argv )
{
   char src[] = "They are students.";
   char dest[] = "aeiou";
   char * pResult = string_del_characters( src, dest );
   std::cout << pResult << std::endl;
}