C Programming - Bitwise Operators
Exercise "You cannot shake hands with a clenched fist."
- Indira Gandhi
1.
Assunming, integer is 2 byte, What will be the output of the program?
#include<stdio.h>
int main()
{
printf("%x\n", -1>>1);
return 0;
}
Answer: B
Explanation:
Negative numbers are treated with 2's complement method.
Binary of 1(2byte) : 0000 0000 0000 0001
Representing -1:
1s complement of 1(2byte) : 1111 1111 1111 1110
Adding 1 to 1's comp. result : 1111 1111 1111 1111
Right shift 1bit(-1>>1): 1111 1111 1111 1111 (carry out 1)
Hexadecimal : f f f f
(Filled with 1s in the left side in the above step)
Note:
1. Fill with 1s in the left side for right shift for negative numbers.
2.
If an unsigned int is 2 bytes wide then, What will be the output of the program ?
#include<stdio.h>
int main()
{
unsigned int m = 32;
printf("%x\n", ~m);
return 0;
}
Answer: A
Explanation:
No answer description available for this question. Let us discuss
3.
Assuming a integer 2-bytes, What will be the output of the program?
#include<stdio.h>
int main()
{
printf("%x\n", -1<<3);
return 0;
}
Answer: D
Explanation:
The system will treat negative numbers in 2's complement method.Example: FF F8 . (Required Answer)Note: How is the negative number obtained from 2's complement value? Example:
4.
If an unsigned int is 2 bytes wide then, What will be the output of the program ?
#include<stdio.h>
int main()
{
unsigned int a=0xffff;
~a;
printf("%x\n", a);
return 0;
}
Answer: D
Explanation:
No answer description available for this question. Let us discuss
5.
What will be the output of the program?
#include<stdio.h>
int main()
{
unsigned char i = 0x80;
printf("%d\n", i<<1);
return 0;
}
Answer: E
Explanation:
No answer description available for this question. Let us discuss
