C++ Programming Code Examples
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C++ Program to Implement Interpolation Search Algorithm
/* C++ Program to Implement Interpolation Search Algorithm
- It is a better approach for uniform data.
- Implement binary search using interpolation approach.
- The time complexity is O(log(n)).
- Implement the binary search on a sorted array.
- Calculate mid value using interpolation formula.
- Exit. */
#include<iostream>
using namespace std;
// A function implementing Interpolation search on a sorted array.
void InterpolationSearch(int a[], int start, int end, int item)
{
int mid;
// Assigning middle of the array.
mid = start+((item-a[start])*(end-start))/(a[end]-a[start]);
if(item == a[mid])
{
cout<<"\nItem found at "<<mid<<" index.";
return;
}
// Return if item found at start index.
else if(item == a[start])
{
cout<<"\nItem found at "<<start<<" index.";
return;
}
// Return if item found at end index.
else if(item == a[end])
{
cout<<"\nItem found at "<<end<<" index.";
return;
}
else if(mid == start || mid == end)
{
cout<<"\nElement not found";
return;
}
// According to the item value choose the partition to proceed further.
else if(item > a[mid])
InterpolationSearch(a, mid, 19, item);
else
InterpolationSearch(a, start, mid, item);
}
int main()
{
int n, i, biter, a[20]={1, 4, 28, 44, 88, 76, 47, 99, 33, 62, 24, 13, 74, 84, 19, 86, 63, 77, 48, 23};
char ch;
up:
cout<<"\nEnter the Element to be searched: ";
cin>>n;
// Implement Interpolation search.
InterpolationSearch(a, 0, 19, n);
// Ask user to enter choice for further searching.
cout<<"\n\n\tDo you want to search more...enter choice(y/n)?";
cin>>ch;
if(ch == 'y' || ch == 'Y')
goto up;
return 0;
}
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