ISRO-DEC2017-74

Question

Consider the function

int func(int num)
{
    int count=0;
    while(num)
    {
        count++;
        num>>=1;
    }
    return(count);
}

For $func(435)$ the value returned is

• A. $9$
• B. $8$
• C. $0$
• D. $10$

Comments

9 no of bit to represent 435

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https://gateoverflow.in/1964/gate2014-2-10

Answer 1

num>>1 is equivalent to num/2

in while loop , value of num will change as follows:

1.  435 /2 =217  
2.  217 /2 =108  
3.  108 /2 =54 
4.  54 /2 =27
5.  27 /2 =13 
6. 13 /2 =6 
7. 6 /2 =3
8. 3 /2 =1
9. 1 /2 =0 

Since it looped 9 times value of count will be 9

Answer is A

Answer 2

plz refer here: https://gateoverflow.in/1964/gate2014-2-10