A: #include

// Test to see if pointer hopping is worthwhile.

// strlen implemented with usual indexing mechanism. int strlen1( const char str[ ] )

{

int i;

for( i = 0; str[ i ] != '\0'; i++ )

;

return i;

}

// strlen implemented with pointer hopping. int strlen2( const char *str )

{

const char *sp = str;

while( *sp++ != '\0' )

;

return sp - str - 1;

}

// Quick and dirty main int main( )

{

char str[ 512 ];

cout << "Enter strings; use EOF-marker to terminate: " << endl;

while( cin >> str )

{

if( strlen1( str ) != strlen2( str ) )

cerr << "Oops!!!" << endl;

}

return 0;

}