student@uso:~$ grep search workspace/C/searching/binary_search.c
 * search](https://en.wikipedia.org/wiki/Binary_search_algorithm) of a target
 * \param[in] arr array to search
 * \param l left index of search range
 * \param r right index of search range
 * \param x target value to search for
int binarysearch1(const int *arr, int l, int r, int x)
[...]