Please explain the flow friends

Question

while running the code the output comes as 6..
I don"t know how the 6 comes.
#include <stdio.h>

int main() {

int a=-3;
a=-a-a+!a;
printf ("%d\n",a);
return 0;
}
Can anyone say how it comes???

Answer 1

a is -3
-a is 3
3 - (-3) = 6

then comes the confusing part, "+!a"

in C, anything other than 0 is considered true, so "!a" equates to 0

6 + 0 = 6

thus the final result is 6

Answer 2

hinanawi thank you so much😊😊😊