Decimal output parameter rounded to integer in EF5.0

extension String{
    func toDouble() ->Double{
        return (self as NSString).doubleValue
    }
}

labelPassedData.text.toDouble() //Your text as Double

x/y = z = (floor(100*x/y)/100)+d

d=(x/y)-(floor(100*x/y)/100)

x/y = z = (floor(100*x/y)/100)+(x/y)-(floor(100*x/y)/100)

D=d*y=d(0)+d(1)+d(2)+...+d(y-1)

D=x-((floor(100*x/y)/100)*y)
d(i)=         floor(100*D/y)/100    i = { 1,2,3,...,y-1 }
d(0)=D-(y-1)*(floor(100*D/y)/100)

{ 0.01, 0.02, 0.03, ... , 0.11 }

D=x-((floor(100*x/y)/100)*y)
d(i)=         floor(100*D/y)/100+0.01    i = <0 , y-1> AND i <  100*(D%y)
d(i)=         floor(100*D/y)/100         i = <0 , y-1> AND i >= 100*(D%y)   

int i,n,y=12; double x=10000.00,fy=y,z,D,d,s;
z=floor((100.0*x)/fy)*0.01;         // cell value rounded
D=x-(z*fy);                         // global correction
n=floor((100.0*D)+0.5);             // iregular remainder
for (s=0.0,i=0;i<y;i++)
    {
    d=0.01*floor(100.0*D/y);        // regular local correction
    if (i<n) d+=0.01;               // iregular local correction
    // z+d is the new cell value and s is the sum for check ...
    s+=z+d;
    mm_log->Lines->Add(AnsiString().sprintf("%3i: %5.2f",i,z+d));
    }
mm_log->Lines->Add("--------------");
mm_log->Lines->Add(AnsiString().sprintf("sum: %5.2f",s));

  0: 833.34
  1: 833.34
  2: 833.34
  3: 833.34
  4: 833.33
  5: 833.33
  6: 833.33
  7: 833.33
  8: 833.33
  9: 833.33
 10: 833.33
 11: 833.33
--------------
sum: 10000.00

$ echo "scale=5; 12/7" | bc
1.71428

sum=12
n=7
output=$(echo "scale=5;$sum/$n" | bc)
echo "$output"

$ "scale=5;sum/n"|bc
bash: scale=5;sum/n: No such file or directory

$ sum=3345699
$ n=1000000
$ echo "scale=5;($sum/$n)" | bc
3.34569

$ printf "%.5f" "$(echo "scale=10;$sum/$n" | bc)"
3.34570