IndiaBIX

C Programming - Bitwise Operators - Discussion

Discussion Forum : Bitwise Operators - Point Out Correct Statements (Q.No. 2)
Bitwise Operators
2.
Which of the following statements are correct about the program? 
#include<stdio.h>

int main()
{
    unsigned int num;
    int c=0;
    scanf("%u", &num);
    for(;num;num>>=1)
    {
        if(num & 1)
            c++;
    }
    printf("%d", c);
    return 0;
}
It counts the number of bits that are ON (1) in the number num.
It counts the number of bits that are OFF (0) in the number num.
It sets all bits in the number num to 1
Error
Answer: Option
Explanation:

If we give input 4, it will print 1.
Binary-4 == 00000000 00000100 ; Total number of bits = 1.

If we give input 3, it will print 2.
Binary-3 == 00000000 00000011 ; Total number of bits = 2.

If we give input 511, it will print 9.
Binary-511 == 00000001 11111111 ; Total number of bits = 9.

Discussion:
12 comments Page 2 of 2.
Vijay said:   1 decade ago
If num>>1 means right shift one bit, but what is mean by num>>=1 ?
Saurabh said:   1 decade ago
The answer is A. Let binary value of num is 10101 then the loop checks each bit on by 'if(num & 1)' and num>>=1 right shifts the num bits by 1bit
Post your comments here:

Your comments will be displayed after verification.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers