Binary search program in c recursively

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I think I have it, but when I try to compile, I get the error "expected primary-expression before ']' token" for both recursive calls. Does anyone know why this is occurring? Where a[] is the sorted array, size is the size of the array, and val is the value being searched for. Your code has a critical bug. When writing such algorithms, you should spend some time to list test cases.

To test comprehensively, I'd write a couple loops that would check all the following combinations:. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more.

Recursive binary search program in C Ask Question. Asked 9 years, 8 months ago. Active 8 years, 5 months ago. Viewed 3k times. Improve this question. Mat k 39 39 gold badges silver badges bronze badges. Joshpho Joshpho 75 4 4 silver badges 13 13 bronze badges.

Repeatedly check until the value is found or the interval is empty. Example : The idea of binary search is to use the information that the array is sorted and reduce the time complexity to O Log n. We basically ignore half of the elements just after one comparison. WriteLine "Element not present" ; else Console.

Idea: Every number can be represented as a sum of the powers of the number 2. Initialize an index as 0. Loop while the computed power is greater than 0 and each time divide it by 2. If so the target element is present in the array, else not. Skip to content. Change Language. Related Articles. Table of Contents. Improve Article.