A program to find the binary equivalent of the decimal number using function

I have written a program to find out the binary equivalent of the decimal number using function. Last time I had written the same program without using function. To have clear idea have a look for the source code and the output below:
The output of the above program is:

The main source code of the above output is:

	#include<stdio.h>
	#include<conio.h>
	int i,num, base=1,sum=0,rem,a;
	int binary_equivalent(int num);
	int main()
	{
	printf("enter the decimal no whose binary equivalent is to be found\n");
	scanf("%d",&num);
	a= binary_equivalent(num);
	printf("the binary equivalent of the above entered decimal no is \n%d",a);
	getch();
	}
	int binary_equivalent(int num)
	{
	i=num;
	while(num!=0)
	{
	rem=num%2;
	sum=sum+rem*base;
	base=base*10;
	num=num/2;
	}
	return sum;
	}

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