Reversing a number (integer) in C?

Question

input: 2761263
output: 36,216,72 (inclusion of , in the reverse number)

Answer 1

int main()
{
int in = 2761263;
int out = 0;
while(in){
out = 10*out + in%10;
in /=10;
}
printf("output %d\n",out);
}
just it will reverse the number..

Comments

I think its half answer only he is asking "," comma insertion also in the output number :).

Answer 2

Check the following code should help (however it is only for the US based numbering (you can modify the code for the other system i.e. change the position of the comma (,)

int numdigits(int number)
{
 int digits = 0;
 while (number != 0) { number /= 10; digits++; }
 return digits;
}

reverse(int x)
{
  if (x<10)
  {
    printf("%d", x);
    return;
  }

  reverse(x%10);

  if (numdigits(x)%3 == 1)
    printf(",");

  reverse(x/10);
}

main()
{
  int i=1234567;
  reverse(i);
}