C Programming - Expressions - Discussion
Discussion Forum : Expressions - Find Output of Program (Q.No. 2)
2.
Assuming, integer is 2 byte, What will be the output of the program?
#include<stdio.h>
int main()
{
printf("%x\n", -2<<2);
return 0;
}
Answer: Option
Explanation:
The integer value 2 is represented as 00000000 00000010 in binary system.
Negative numbers are represented in 2's complement method.
1's complement of 00000000 00000010 is 11111111 11111101 (Change all 0s to 1 and 1s to 0).
2's complement of 00000000 00000010 is 11111111 11111110 (Add 1 to 1's complement to obtain the 2's complement value).
Therefore, in binary we represent -2 as: 11111111 11111110.
After left shifting it by 2 bits we obtain: 11111111 11111000, and it is equal to "fff8" in hexadecimal system.
Negative numbers are represented in 2's complement method.
1's complement of 00000000 00000010 is 11111111 11111101 (Change all 0s to 1 and 1s to 0).
2's complement of 00000000 00000010 is 11111111 11111110 (Add 1 to 1's complement to obtain the 2's complement value).
Therefore, in binary we represent -2 as: 11111111 11111110.
After left shifting it by 2 bits we obtain: 11111111 11111000, and it is equal to "fff8" in hexadecimal system.
Discussion:
33 comments Page 4 of 4.
Nitesh said:
5 years ago
@Gokulram.
It's a hexadecimal form of Binary.
like,
0000 = 0,
0001 = 1,
0011 = 3.................
1001 = 9,
1010 = A
1011 = B .till 15 means 1111 = F. Thats it.
It's a hexadecimal form of Binary.
like,
0000 = 0,
0001 = 1,
0011 = 3.................
1001 = 9,
1010 = A
1011 = B .till 15 means 1111 = F. Thats it.
Nitesh said:
5 years ago
For 2 byte Means, 2 * 8 = 16 bits.
NOTE: When we have negative value at that time we have to find 1's and 2's complement of the number.
0000 0000 0000 0010 // 2
1111 1111 1111 1101 // 1's complement
+ 1 // 2's complement.
---------------------
1111 1111 1111 1110 // -2
-2 << 2
1111 1111 1111 1110 << 0000 0000 0000 0010
1111 1111 1111 1100 ---Step 1
1111 1111 1111 1000 ---Step 2 // Final Answer.
HexaDecimal form Of Final Answer: f f f 8.
NOTE: When we have negative value at that time we have to find 1's and 2's complement of the number.
0000 0000 0000 0010 // 2
1111 1111 1111 1101 // 1's complement
+ 1 // 2's complement.
---------------------
1111 1111 1111 1110 // -2
-2 << 2
1111 1111 1111 1110 << 0000 0000 0000 0010
1111 1111 1111 1100 ---Step 1
1111 1111 1111 1000 ---Step 2 // Final Answer.
HexaDecimal form Of Final Answer: f f f 8.
Thrinesh said:
2 months ago
@All.
- %X → Prints uppercase hexadecimal (A-F instead of a-f).
- %#x → Adds "0x" prefix (0xff).
- %#X → Adds "0X" prefix (0XFF).
- %X → Prints uppercase hexadecimal (A-F instead of a-f).
- %#x → Adds "0x" prefix (0xff).
- %#X → Adds "0X" prefix (0XFF).
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