Random generation c++ program

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#include<iostream>   // based on the principle of prime,odd,even  numbers
using namespace std;
#include<conio.h>
#include<math.h>
int j=0,s=1;bool prime(int num);
int random(int k);
int main()
{ int d=100,i,num;
cout<<"Enter any  number  :";
cin>>num;
cout<<"random numbers generated\n";
for( i=num;i<d;)
   { cout <<abs(i)<<" ";i=random (i);}
getch();
}
int random(int k)
{
    if (prime(k))
  return (k- ++j);
  else if (k%2!=0){
  return (k+ ++s);}
  else
  return k+ ++j;
}
bool prime(int num)
{int c=1;for(int i=2;i<=num;i++)
         if(num%i==0)
         ++c;
         if (c==2)
         return 1;
         else
         return 0;
}