What is -(-128) for signed single byte char in C?

Question

My little program:

#include 

int main() {
    signed char c = -128;
    c = -c;
    printf(\"%d\", c);
    return 0;
}

prin

Answer 1

because a byte(char) can't hold 128

-128 = 0x80

what neg do is reverse it and plus 1

-(-128) = (~0x80) + 1 = 0x7F + 1 = 0x80

daha, you got 0x80 again