Can anybody tell the internal procedure of the below code
<? $temp = 0; echo ~$temp; ?>
//instead of 1 it displays -1
Can anybody tell the internal procedure of the below code <? $temp = 0;
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Can anybody tell the internal procedure of the below code
<? $temp = 0; echo ~$temp; ?>
//instead of 1 it displays -1
Bitwise-not (~):
This inverts each bit of its operand. If the operand is a floating point value, it is truncated to an integer prior to the calculation. If the operand is between 0 and 4294967295 (0xffffffff), it will be treated as an unsigned 32-bit value. Otherwise, it is treated as a signed 64-bit value
Its because you’re actually dealing with a full 32-bit unsigned integer with NOT. What that means is you’re not simply inverting 0001 but inverting 00000000000000000000000000000001
which becomes 11111111111111111111111111111110
essentially this is the number + 1 and negated. so 1 becomes -(num+1) which is -1 or
1111111111111111111111111111110
in binary (unsigned)
for example:-
$temp=1; echo~$temp; print -2 //-(n++)