Binary Search

I am writing a binary search that the user can input data that should be on a text file. Then I need to test the function using the sorted arrays by testing on these following numbers
12 30 33 81 99 85 28 24 25
24 26 27 9 41 32 35 23 39
43 41 46 56 62 8 20 22 18
or
generate a rand() at least 25

#include <stdio.h> #define DESIRED_VAL 44 #define ARR_SIZE 50 int binsrch (int *arr, int lb, int up); main() { int arr [ARR_SIZE], i,j, lower, upper, index; for (i=0;i<ARR_SIZE; i=i+1) arr[i]= 2*i; printf ("Desired Value = %d\n", DESIRED_VAL); lower = 0; upper = ARR_SIZE-1; index = binsrch (arr, lower, upper); if (index > 0) printf ("the number %d was found at index %d\n", DESIRED_VAL, index); else printf ("the number %d was not found\n", DESIRED_VAL); } int binsrch (int *arr, int lb, int up) { int mid; int index; mid = (up+lb)/2; if (lb>up) return (-1); printf ("looking in position %d\n", mid); if (arr[mid]==DESIRED_VAL) return (mid); if (arr[mid]<DESIRED_VAL) { return (binsrch (arr, mid+1, up)); } else { index = binsrch(arr, lb, mid-1); return (index); } }