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conduct a binary search to find the element. Return the index upon successful search, else return -1.
- funtoosh May 27, 2013java code:
static int search_sortedarr(int num, int [] arr, int start_index,int end_index){
int mid = start_index + (end_index-start_index)/2;
if(end_index<=start_index && num!=arr[mid]) return -1;
if(num == arr[mid]) return mid;
else if(num>arr[mid]) return search_sortedarr(num, arr, mid+1, end_index);
else return search_sortedarr(num, arr, start_index, mid);
}
now, make a call to search_sortedarr(k,arr,0,arr.length-1) in the main.