C Program to Convert Decimal number system to Binary number system using array

#include<stdio.h> 
#include<conio.h> 
int main() 
{ 
      int a[20]; 
      int dec,i=0;
      printf("Enter the decimal number to find its binary number\n"); 
      scanf("%d",&dec); 
      while(dec>0) 
      { 
           a[i]=dec%2; 
           i++; 
           dec=dec/2;
      }
      printf("Binary number of %d is = ",dec); 

      for(int j=i-1;j>=0;j--) 
      {
            printf("%d",a[j]);
      }
      getch();
 }