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CBSE Class 12 Computer Science Question 77 of 101

Functions — Question 45

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45
Question

Question 38

Predict the output of the following code:

def express (x, n) :
    if n == 0:
        return 1
    elif n % 2 == 0:
        return express (x*x, n/2) 
    else:
        return x * express (x, n-1) 
express (2, 5)
Answer

The code will not print anything because it doesn't include a print statement. Instead, it returns a value without displaying it.

Explanation

The code defines a recursive function express(x, n) that takes two arguments x, n. Inside the function, it checks for three conditions: if n is 0, it returns 1; if n is even (checked using the modulo operator), it recursively calls itself with x*x and n/2; and if n is odd, it recursively calls itself with x and n-1, then multiplies the result by x. When express(2, 5) is called, it eventually evaluates to 32 but does not print or display anything.