C Program To Perform Binary Search On 10 Elements Rating: 6,6/10 6461 votes

C Program to implement Binary Search Tree Traversal. Get_node() function will allocate memory dynamically and allocate one node. If below condition is satisfied then we can say that we are going to create first node of the tree. (i.e Tree is empty and this created node is very first node). Enter the elements in ascending order: 4 7 8 11 21. Enter the number to be search: 11. The number is found. Write a c program for linear search. Write a c program for binary search. Write a c program for binary search using recursion. Big list of c program examples. Email This BlogThis! Share to Twitter Share to Facebook Share to. Is there a possibility of the program being able to tell the user if he is attempting to perform such a search (of something that's not in the array)? I am assuming it is not possible as it is a basic flaw in the binary search algorithm. Please enlighten me. This C Program accepts the sorted array and does search using Binary search. Binary search is an algorithm for locating the position of an item in a sorted array. A search of sorted data, in which the middle position is examined first. C Program for Binary Search Tree Creation and Traversals. Binary Search Tree is a Tree which has the following properties, 1.The left sub tree of a node contains smaller nodes than a root node. 2.The right sub tree of a node contains greater nodes than a root node. 3.Both the left and right sub trees must also be binary search trees.

  1. Program To Perform Binary Search
  2. Binary Search Java
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C Program to find an Element using Binary Search. C Program to Perform Arithmetic Operations Using Switch. C Program to Print Elements of Array Using Pointers.

I've found the following code online,

My function has a specified prototype(meaning that it has a set number of arguments that cannot be altered) this is what I have so far

Does my implementation look correct so far? I can't seem to figure out how to implement the final else statement.

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7 Answers

high and low represent the bounds of subarray in which continue the research. If you analyze the code you'll notice that if target is smaller that a[middle] you'll have to continue the research in the first half of the array (in fact it calls binary_search passing the same low bound but, as a superior bound, the actual middle-1). On the other side, if target is greater that a[middle] you'll have to continue the research in the second half of the array (from middle+1 to high). Of course, if target is equal to a[middle] you've finished.

ManlioManlio
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The trick to writing a recursive anything:

  1. Figure out how it should end.
  2. Figure out how it should look one step before it ends.
  3. Figure out how it should look two steps before it ends, and how moving from #2 to #1 is exactly the same as moving from #3 to #2.

Step #1:

If the number at the beginning of the search range is the desired number, return true.

If the end of the search range is the same as the beginning of the search range, and the number in the search range is not the desired number, return false.

Step #2:

If the search range has a length of two, split it into two one element search ranges, and search the range that might contain the required number.

Step #3:

If the search range has a length of more than two, split it into two roughly equal search ranges, and search the range that might contain the required number.

(which combining the two would look like)

If the search range has a length of two or more elements, split it into two roughly equal ranges, check the highest (last) number in the 'lower' range, if the number is equal to or less than that number, search the lower range; otherwise, search the higher range.

This technique will not return you an optimum solution unless you select an optimum way to solve the problem; however, it will return you a correct solution (provided you do not make any true blunders).

Now the code

When reading code online, you have a big disadvantage. You don't do any of the above three steps, so you really have to go about solving the problem backwards. It is akin to saying, I have a solution, but now I have to figure out how someone else solved it (assuming that they didn't make any mistakes, and assuming that they had the exact same requirements as you).

Edwin BuckEdwin Buck
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The high and low variables represent the current range you are searching. You usually start with the beginning and end of the array, and then determine if the value is in the first or second half, or exactly in the middle. If it is in the middle, you return that point. If it is below the middle, you search again (recursively), but now only in the lower half. If it is above the middle, you search the upper half. And you repeat this, each time dividing up and narrowing the range. If you find the value, you return, otherwise, if the range is so narrow that it is empty (both low and end high indexes are the same), you didn't find it.

Rudy VelthuisRudy Velthuis
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High and low are upper and lower bounds on the candidate indices of the array. In other words, they define the portion of the subarray in which it is possible for the search target to exist. Since the size of the subarray is cut in half each iteration, it is easy to see that the algorithm is O(log n).

Patrick87Patrick87
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On your current code, first of all, n should not be in parentheses (it doesn't make a difference, but it confuses me).

Next up, if it's meant to be returning the index in the array, your code doesn't do that, it returns 1. Judging by the prototype, you might consider a non-recursive approach, but this can work fine if you add the right values on to each return.

You can figure out the other statement. Just draw a picture, figure out where the pointers should be, and code them up. Here's a start:

Actually, you probably don't want to be including your middle value. Finally, make sure to take in to account lists of length zero, one, two and three. And please write unit tests. This is probably one of the most often incorrectly implemented algorithms.

dougalljdougallj

I have tried to resolve your problem and this below code is really work . But what is the condition to escape recursion if value that want to be searched not lies in array

TheCodeArtist
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Hakun NguyenHakun Nguyen
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Not the answer you're looking for? Browse other questions tagged c or ask your own question.

/* C program for binary search: This code implements binarysearch in */

/* C language. It can only be used for sorted arrays, but it'sfast as */

/* compared to linear search. If you wish to use binary searchon an */

/* array which is not sorted then you must sort it using somesorting */

/* technique say merge sort and then use binary search algorithmto */

/* find the desired element in the list. If the element to besearched */

/* is found then its position is printed. */

#include<stdio.h>

main()

{

int c, first, last, middle, n, search, array[100];

printf('Enter number of elementsn');

scanf('%d',&n);

printf('Enter %d integersn', n);

for ( c = 0 ; c < n ; c++ )

scanf('%d',&array[c]);

printf('Enter value to findn');

scanf('%d',&search);

first = 0;

last = n - 1;

middle = (first+last)/2;

while( first <= last )

{

if ( array[middle] < search )

first = middle + 1;

else if ( array[middle] search )

{

printf('%d found at location %d.n', search, middle+1);

break;

}

else

last = middle - 1;

middle = (first + last)/2;

}

if ( first > last )

printf('Not found! %d is not present in the list.n',search);

return 0;

}

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