C Program To Convert Decimal to Binary Decimal to Octal

#include<stdio.h>
#include<conio.h>
void main()
{
int bin[10],n,num,i,dig,j,opt;
char c;
clrscr();
do
{
 printf("***Menu***\n1.Decimal to Binary\n2.Decimal to Octal\n3.Exit");
 printf("\nEnter Ur choice: ");
 scanf("%d",&opt);
 switch(opt)
 {
 case 1: printf("Enter Decimal number: ");
 scanf("%d",&n);
 num=n;
 i=0;
 while(n>0)
 {
 dig=n%2;
 bin[i]=dig;
 n=n/2;
 i++;
 }   printf("Equivalent Binary of Decimal %d is :",num);
  for(j=i-1;j>=0;j--)
  printf(" %d",bin[j]);

break;
case 2: printf("Enter Decimal number: ");
 scanf("%d",&n);
 i=0;
 num=n;
 while(n>0)
 {
 dig=n%8;
 bin[i]=dig;
 n=n/8;
 i++;
 }   printf("Equivalent Octal of Decimal %d is :",num);
  for(j=i-1;j>=0;j--)
  printf(" %d",bin[j]);

break;
case 3: exit(0);
 break;
default: printf("*****Invalid Choice*****");
}
printf("\nDo U want to Continue (y/n): ");
fflush(stdin);
c=getchar();
}while(c=='Y'||c=='y');
getch();
}