how o/p is 1

ramsree · **Posted:** Thu Sep 08, 2011 7:51 am

main()
{
int c;
c=-2&&3&&1;
printf("%d",c);
getch();
}

its o/p is 1 how?

msi_333 · **Posted:** Thu Sep 08, 2011 7:18 pm

First i want to remind you of two things :
First ll and && are logical operators , their results can be 1 (true) or 0 (false) , and you are using it on numbers
http://publib.boulder.ibm.com/infocente ... ogande.htm

Second negative numbers in C++ is represented in 2's complement form.
For example (If we assume for simplicity using 1 byte)
-2 ==>-( 00000010)=11111101+1=11111110

using bit-wise operators like and & and | show different results :

Code:

#include<iostream>
#include<conio.h>
using namespace std;

void main()
{
int c;
c=(-2)&(3)&(1);
printf("%d",c);
getch();
}
 

11111110 AND 00000011 AND 00000001 = 00000000
the results is 0 not 1 .

how o/p is 1

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