Simply use modulo
#include <stdio.h>
int main(){
for (int i = -23;i<23;i++) printf("%d %d\n",i,i%11);
return 0;
}
all modern C variants should work the same way https://en.wikipedia.org/wiki/Modulo_operation (result have same sign as divident):
-23 -1
-22 0
-21 -10
-20 -9
-19 -8
-18 -7
-17 -6
-16 -5
-15 -4
-14 -3
-13 -2
-12 -1
-11 0
-10 -10
-9 -9
-8 -8
-7 -7
-6 -6
-5 -5
-4 -4
-3 -3
-2 -2
-1 -1
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 0
12 1
13 2
14 3
15 4
16 5
17 6
18 7
19 8
20 9
21 10
22 0