Tell me how conditions are working?

Question

#include <stdio.h>

int main() {
if(7&8)
printf ("Honesty");
if((~7&0x00f)==8);
printf ("is the best policy \n");

return 0;
}

Answer 1

Learn about bitwise operations and you'll figure out the answer to your question. Keep in mind any non-zero result evaluates to true while zero evaluates to false.

https://www.sololearn.com/learn/4070/?ref=app

Answer 2

NonStop Coding
It's mentioned in the bitwise operations and Simba knows this I'm pretty sure

BABLU TAUNWAL there is also a semicolon immediately after the closing parenthesis for the if condition, making it pointless, so that the last printf() should always run regardless of the evaluated result of the condition.

Answer 3

ChaoticDawg

Ooh thanks I got it

I did not notice the the semicolon

so for the first if condition

binary of 7 is 0111
binary of 8 is 1000

0111 & 1000 will be 0000

so the first condition will be false

Answer 4

Also, The general formula to calculate the tilde operation ~i is ~i=-i-1
So, ~7 will return -8

Answer 5

For the second if

Binary of 7 is 00000111

~7 will be one's complement

~7 = 11111000 which is -8 ( in decimal)

0x00f = 15 ( in decimal )

So,

-8 & 15 will be equal to 8

Second if condition is true

If(( ~7 & 0x00f) == 8) will be true

/**********************************/

and for the first if condition

binary of 7 is 0111
binary of 8 is 1000

0111 & 1000 will be 0000

so the first condition will be false

Answer 6

And 0x00f is a hex number(base 16) which is 15 in decimal for those wondering

Answer 7

NonStop CODING examples of one's complement should include the remaining bits of the byte or word. Consider all 8 bits of a signed char:

7 = 00000111
~7 = 11111000
= 0xf8

Compare with -8 (two's complement):

8 = 00001000
-8 = ~8+1 = 11110111+1
= 11111000
= 0xf8

~7 == -8

Answer 8

Brian

Yeah thanks for correction
All the 8 bits

~7 & 15 will be 8
Not ~7
👍

Answer 9

great answer is here :

https://www.sololearn.com/Discuss/2994377

Answer 10

Simba

~ is one's complement

one's complement of 7 is 0

but from where to solve ?

left to right
or
right to left

I think it's left to right

Answer 11

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