Why modulo with negative oprands returns first sign of its expression?

Question

Why modulo with negative oprands returns first sign of its expression?

example:
int main() {
string b= "\n";

cout << (25/7);
cout << (-25%-7);
cout << (-25%7);
cout << (25%-7);
return 0;
}
outputs : 4,-4,-4,4;

Answer 1

Expanded version

4 / 3 = 1
4 % 3 = 1

-4 / 3 = -1
-4 % 3 = -1

4 / -3 = -1
4 % -3 = 1

-4 / -3 = 1
-4 % -3 = -1

Answer 2

Do simple division on a paper.

E.g.

____
4 ) -3
3 -1
------
1

Answer 3

+---------------------------+
| m | d | / | % |
+-----+-----+-----+-----+
| 4 | 3 | 1 | 1 |
+-----+-----+-----+-----+
| -4 | 3 | -1 | -1 |
+-----+-----+-----+-----+
| 4 | -3 | -1 | 1 |
+-----+-----+-----+-----+
| -4 | -3 | 1 | -1 |
+---------------------------+

[https://pasteboard.co/GCmp9GQ.jpg]

Answer 4

See the link dear Sakshi.

Answer 5

ohhhhhh Thnk u

Answer 6

@babak sheykahan (PERS) I didn't understood question and answer also

Answer 7

didn't understood can u explain clearly

Answer 8

@babak Thanks a lot for your helpful information.

Answer 9

it is somewhat implementation dependent
like in c++ (-7%3 == -1)
but in python
(-7%3 == 1)
so it varies with the language using...