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Zoho Interview | Set 2 Question 3

Form a number system with only 3 and 4. Find the nth number of the number system.

Eg.) The numbers are: 3, 4, 33, 34, 43, 44, 333, 334, 343, 344, 433, 434, 443, 444, 3333, 3334, 3343, 3344, 3433, 3434, 3443, 3444 ….


My Solution::

#include<stdio.h>
#include<conio.h>

void bin(int n){
 if(n>1)
 bin(n/2);
 printf("%d",(n%2)?3:4);
}


int main(){
int num,i;
clrscr();
scanf("%d",&num);
i = 1;
do{
  num -= 1<<i;
  i++;
}while(num);
--i;
--i;
num += 1<<i;
bin(num);
getch();
return 0;
}

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