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2019-11-15 12:59:38 +01:00
parent 40a414d210
commit b880c3ccde
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+Fig10_40.cpp - Algorithms to compute Fibonacci numbers
+	
+	#include <iostream.h>
+
+/* START: Fig10_40.txt */
+        /**
+         * Compute Fibonacci numbers as described in Chapter 1.
+         */
+        int fib( int n )
+        {
+            if( n <= 1 )
+                return 1;
+            else
+                return fib( n - 1 ) + fib( n - 2 );
+        }
+/* END */
+
+/* START: Fig10_41.txt */
+        /**
+         * Compute Fibonacci numbers as described in Chapter 1.
+         */
+        int fibonacci( int n )
+        {
+            if( n <= 1 )
+                return 1;
+
+            int last = 1;
+            int nextToLast = 1;
+            int answer = 1;
+            for( int i = 2; i <= n; i++ )
+            {
+                answer = last + nextToLast;
+                nextToLast = last;
+                last = answer;
+            }
+            return answer;
+        }
+/* END */
+
+        int main( )
+        {
+            cout << "fib( 7 ) = " << fib( 7 ) << endl;
+            cout << "fibonacci( 7 ) = " << fibonacci( 7 ) << endl;
+            return 0;
+        }