Binary Search

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Binary Search – Creating function

def binary_search(arr, x): 
    low = 0
    high = len(arr) - 1
    mid = 0
    while low <= high: 
        mid = (high + low) // 2
        # Check if x is present at mid 
        if arr[mid] < x: 
            low = mid + 1
        # If x is greater, ignore left half 
        elif arr[mid] > x: 
            high = mid - 1
        # If x is smaller, ignore right half 
        else: 
            return mid 
   # If we reach here, then the element was not present 
    return -1

Binary Search – Calling Function

# Test array 
arr = [ 2, 3, 4, 10, 40 ] 
x = 10

# Function call 
result = binary_search(arr, x) 
if result != -1: 
    print("Element is present at index", str(result)) 
else: 
    print("Element is not present in array")