Question about strstr()

I want to find the occurances of a list of words(eg: MTR, UK, USA, MAC, MS, DHL) in an array, thus, I make use of a strstr() function. However, the function can only accept matching one element a time, how can I match a list of word by using strstr()?

Here's my code

Code:

#include <iostream>
#include <cstring>
#include <cstdio>
#include <stdlib.h>

using std::cin;
using std::cout;
using std::endl;

int main()
{

   char str[] = "Making Simple Things Simple. With todays programming languages, most people find it very difficult to do even simple things.";
   char *pch;
   char *abc;
   pch = &str[0];

   while ( pch != NULL )
   {
      pch = strstr (pch,"simple");   // for instance: How can I match "simple" and "difficult" by using only one strstr expression at a time?
      if ( pch != NULL )
      {
         cout << pch;
         pch = &pch[0+6];
      }
   }

   system("PAUSE");
   return 0;
}

> How can I match "simple" and "difficult" by using only one strstr expression at a time?
You can't - so you need to call strstr() twice, once for each string

Code:

char *a = strstr( pch, "simple" );
char *b = strstr( pch, "difficult" );
if ( a != NULL && b != NULL ) {
  if ( a < b ) {
    // found simple first
  } else {
    // found difficult first
  }
} else {
  // either (or both) are NULL - handle cases
}

...oh, ic...I think I would rather use "switch" to handle the cases...
by the way, great thx to Salem...