**fig10_41.txt**

/* 1*/	int
/* 2*/	Fibonacci( const unsigned int N )
/* 3*/	{
/* 4*/	    unsigned int Last = 1, Next_To_Last = 1, Answer;

/* 5*/	    if( N <= 1 )
/* 6*/	        return 1;

/* 7*/	    for( int i = 2; i <= N; i++ )
/* 8*/	    {
/* 9*/	        Answer = Last + Next_To_Last;
/*10*/	        Next_To_Last = Last;
/*11*/	        Last = Answer;
/*12*/	    }

/*13*/	    return Answer;
/*14*/	}