divides stuff by 12 to test other stuff

div.c

#include <stdio.h>

void main(void){
  for(int i=-13;i<=13;i++){
    int iresult=i/12;
    float fresult=((float)i)/12.0f;
    printf("%d\t%d\t%d\t%f\n",i,iresult,((int)fresult),fresult);
  }
}

/*
-13	-1	-1	-1.083333
-12	-1	-1	-1.000000
-11	0	0	-0.916667
-10	0	0	-0.833333
-9	0	0	-0.750000
-8	0	0	-0.666667
-7	0	0	-0.583333
-6	0	0	-0.500000
-5	0	0	-0.416667
-4	0	0	-0.333333
-3	0	0	-0.250000
-2	0	0	-0.166667
-1	0	0	-0.083333
0	0	0	0.000000
1	0	0	0.083333
2	0	0	0.166667
3	0	0	0.250000
4	0	0	0.333333
5	0	0	0.416667
6	0	0	0.500000
7	0	0	0.583333
8	0	0	0.666667
9	0	0	0.750000
10	0	0	0.833333
11	0	0	0.916667
12	1	1	1.000000
13	1	1	1.083333
*/

div.lua

local math=require'math'

local function intdiv(a, b) -- Lua actually doesn't do integers until version 5.3 (which you don't wanna use because LuaJIT), so truncating here
    q = a/b
    return (q > 0) and math.floor(q) or math.ceil(q)
end

for i=-13,13 do
  iresult=intdiv(i,12)
  fresult=i/12.0
  print(("%d\t%d\t%d\t%f"):format(i,iresult,intdiv(fresult,1),fresult))
end

--[[
-13     -1      -1      -1.083333
-12     -1      -1      -1.000000
-11     0       0       -0.916667
-10     0       0       -0.833333
-9      0       0       -0.750000
-8      0       0       -0.666667
-7      0       0       -0.583333
-6      0       0       -0.500000
-5      0       0       -0.416667
-4      0       0       -0.333333
-3      0       0       -0.250000
-2      0       0       -0.166667
-1      0       0       -0.083333
0       0       0       0.000000
1       0       0       0.083333
2       0       0       0.166667
3       0       0       0.250000
4       0       0       0.333333
5       0       0       0.416667
6       0       0       0.500000
7       0       0       0.583333
8       0       0       0.666667
9       0       0       0.750000
10      0       0       0.833333
11      0       0       0.916667
12      1       1       1.000000
13      1       1       1.083333
]]

div.py

for i in range(-13,14):
    iresult = i//12
    fresult = i/12
    print('%d\t%d\t%d\t%f' % (i, iresult, int(fresult), fresult)) 

'''
-13     -2      -1      -1.083333
-12     -1      -1      -1.000000
-11     -1      0       -0.916667
-10     -1      0       -0.833333
-9      -1      0       -0.750000
-8      -1      0       -0.666667
-7      -1      0       -0.583333
-6      -1      0       -0.500000
-5      -1      0       -0.416667
-4      -1      0       -0.333333
-3      -1      0       -0.250000
-2      -1      0       -0.166667
-1      -1      0       -0.083333
0       0       0       0.000000
1       0       0       0.083333
2       0       0       0.166667
3       0       0       0.250000
4       0       0       0.333333
5       0       0       0.416667
6       0       0       0.500000
7       0       0       0.583333
8       0       0       0.666667
9       0       0       0.750000
10      0       0       0.833333
11      0       0       0.916667
12      1       1       1.000000
13      1       1       1.083333
'''