Fibonacci Search using CPP

C++/FibonacciSearch.cpp

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+
+#include<iostream>
+
+using namespace std;
+
+void FibonacciSearch(int *a, int start, int end, int *fab, int index, int item)
+{
+	int i, mid;
+
+	// Assigning middle of the array using Fibonacci element.
+	mid = start+fab[index-2];
+
+	// Return if item found at mid index.
+	if(item == a[mid])
+	{
+		cout<<"\n item found at "<<mid<<" index.";
+		return;
+	}
+	// Return if item found at start index.
+	else if(item == a[start])
+	{
+		cout<<"\n item found at "<<start<<" index.";
+		return;
+	}
+	// Return if item found at end index.
+	else if(item == a[end])
+	{
+		cout<<"\n item found at "<<end<<" index.";
+		return;
+	}
+	// If mid becomes start or end of the sub-array then element not found.
+	else if(mid == start || mid == end)
+	{
+		cout<<"\nElement not found";
+		return;
+	}
+	// According to the item value choose the partion to proceed further.
+	else if(item > a[mid])
+		FibonacciSearch(a, mid, end, fab, index-1, item);
+	else
+		FibonacciSearch(a, start, mid, fab, index-2, item);
+}
+
+int main()
+{
+	int n, i, biter, fab[20], a[20]={1, 9, 18, 24, 27, 35, 38, 41, 49, 53, 55, 66, 67, 72, 75, 77, 81, 89, 90, 97};
+	char ch;
+
+	fab[0] = 0;
+	fab[1] = 1;
+	i = 1;
+	while(fab[i] < 20)
+	{
+		i++;
+		fab[i] = fab[i-1]+fab[i-2];
+	}
+
+	up:
+	cout<<"\nEnter the Element to be searched: ";
+	cin>>n;
+
+	// Implement Fibonacci search.
+	FibonacciSearch(a, 0, 19, fab, i, n);
+
+	// Ask user to enter choice for further searching.
+	cout<<"\n\n	Do you want to search more...enter choice(y/n)?";
+	cin>>ch;
+	if(ch == 'y' || ch == 'Y')
+		goto up;
+
+	return 0;
+}