Decimal to Octal

Input A decimal number  
Output An octal number  
complexity O(d)where d is the number of digits in the number  
  
Decimal_to_octal(num)  
1   while (num>0) then  
2   a[i] =num%8;  
3   num= num/8;  
4   i=i+1;  
5   Print a[i] in reverse order  

//converting from decimal to octal number system  
//Input Any positive integer upto 32767  
  
#include< stdio.h>  
#include< conio.h>  
int main()  
{  
    int num,i,a[20],n;  
    printf("Enter a decimal number ");  
    scanf("%d",&num);  
    printf("Octal equivalent of %d is ",num);  
    i=0;  
    while(num> 0)  
    {  
        a[i]=num%8;  
        num=num/8;  
        i++;  
    }  
    for(n=i-1;n> =0;n--)  
    printf("%d",a[n]);  
}