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Output of C++ programs | Set 48 (Bit Manipulation)

  • Difficulty Level : Easy
  • Last Updated : 22 Sep, 2017

Q.1 What Is The Output Of this program ?




#include <iostream>
using namespace std;
int main()
{
    int a = 35;
    int b = 12;
    printf("%d ", ~a);
    printf("%d ", ~ - b);
    return 0;
}

Option
a) -36 11
b) -35 -12
c) 220 11
d) 36 11

ans :-a

Explanation:- For any integer n, bitwise complement of n always will be -(n+1). so here -(35+1) and-(-12+1).

Q.2 What Is The Output Of this program ?




#include <iostream>
using namespace std;
int main()
{
    int a = 12;
    int b = 25;
    int c = 1;
    printf("%d", a ^ b && c);
    return 0;
}

Option
a) 300
b) 1
c) 25
d) 212



ans :-b

Explanation:- In This program, we simple perform a XOR operation between 12(1010) and 25(11001) so result is(10011) equal to the 21, then perform and operation.

Q.3 What Is The Output Of this program ?




#include <iostream>
using namespace std;
int main()
{
    unsigned char a = -8;
    unsigned char b = a >> 1;
    printf("%d\n", b);
}

Option
a) 128
b) -8
c) -4
d) 124

ans :-d

Explanation:- We know that Negative numbers are represented using 2’s complement of its positive equivalent. So the 2’s complement of 8 is (11111000) and we shifted its 1 so its (01111100) is 124.

Q.4 What Is The Output Of this program ?




#include <iostream>
using namespace std;
int main()
{
    signed char a = -128;
    signed char b = a >> 1;
    printf("%d\n", b);
    return 0;
}

Option c
a) 128
b) 256
c) -64
d) 64

ans :- -64

Explanation:- In this code, we are right shifting -128 by 1. The result will be “-64”, binary shift is applied since the operand is a signed value are printed.

Q.5 What Is The Output Of this program ?




#include <iostream>
using namespace std;
int main()
{
    unsigned int x = 3;
    x = x | (x << x);
    cout << x;
    return 0;
}

Option
a) 27
b) 24
c) 1
d) 0

ans :-a

Explanation:- In this program integer a is 3 its binary (011) shifted 3 its(011000) equal to the 24 and add 3 so its equal to the 27.

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