Decimal to Binary Conversion

#include <stdio.h>
#include <math.h>
int convert(int n)
{
    static long int bin;
    static int j;
    int r;
    if(n)
    {
        r = n%2;
        bin += r*pow(10,j++);
        convert(n/2);
    }
    return bin;
}
int main()
{
    int decimal;
    printf("Enter the decimal: ");
    scanf("%d",&decimal);
    printf("The binary form is %ld",convert(decimal));
    fflush(stdin);
    getchar();
    return 0;
}