نحوه عملکرد توابع strchr و strrchr

کد:
#include <iostream>

#include <string>

using namespace std;

void main(void)

{

   char ch='r';

   char string[] =

"The quick brown dog jumps over the lazy fox";

   char fmt1[] =

"         1         2         3         4         5";

   char fmt2[] =

"12345678901234567890123456789012345678901234567890";

   char* pdest;

   int result;

   cout<<"String to be searched: \n\t\t"<<string<<"\n";

    cout<<"\t\t"<<fmt1<<"\n\t\t"<<fmt2<<"\n\n";

     cout<<"Search char:\t"<<ch<<"\n";

/* Search forward. */

   pdest=strchr(string, ch);

    result=pdest - string + 1;

     if( pdest != NULL )

       cout<<"Result:\tfirst "<<ch

           <<" found at position "<<result<<"\n\n";

    else

       cout<<"Result:\t"<<ch<<" not found\n";

/* Search backward. */

   pdest=strrchr(string, ch);

    result=pdest - string + 1;

     if( pdest != NULL )

       cout<<"Result:\tfirst "<<ch

           <<" found at position "<<result<<"\n\n";

     else

       cout<<"Result:\t"<<ch<<" not found\n";

}



//end