why is this result not valid? what's wrong?

[MiraaNovita]

#include<stdio.h>
#include<conio.h>
#include<iostream.h>
main()
{
int a,b;
char d,i;
atas:
clrscr();
printf("first input :");scanf("%i",&a);
printf("second input   :");scanf("%i",&b);
printf("select 1 for Bil. Ganjil and 0 for Bil. Genap [ 1 / 0] : ");scanf("%c",&i);
i=getche();
if (i=='1')
    {
     if(a%2==0)
      {
        a=a+1;
      }
    }
  cout<<"\n";
  while(a<=b)
    {
     cout<<a<<",";
     a=a+2;
     }
 
if(i=='0')
    {
     if (a%2!=0)
      {
        a=a+1;
      }
     }
  cout<<"\n";
  while(a<=b)
     {
      cout<<a<<",";
      a=a+2;
     }
printf("Input again? [Y/T] : ");scanf("%c",&d);
if(d=='Y'||d=='y')
    {
     goto atas;
    }
 {
  getch();
 }
}

[weaknessforcats]

Maybe you could tell me what's not working?