code_gen.cpp

/* 1. Randomly generate any code of four digit no with 
        unit as a fibboniccai no & prime no
        tenth & hundred place difference as 2
        hundred & thousand place difference as 2
 */
#include <bits/stdc++.h>
using namespace std;

int arr[]={2,3,5};

int code_gen(){
    srand(time(NULL));
    int i = rand()%3;
    int code;
    int unit = arr[i];
    int ten = rand()%(6);{
    while(ten==unit || unit==ten+2 || unit==ten+4){
            ten = rand()%(6);
        }
    }
    code = (ten+4)*1000 + (ten+2)*100 + ten*10 + unit;
    return code;
}

int main(){
    int code = code_gen();
    cout<<code;
    return 0;
}