i am getting bunch of zeros as output , no result , i am using mingw as my compiler ,please find error and show me correct way t

Question

here is my source code
/*************************************************
converting decimal to octal number's
**************************************************/
#include <stdio.h>
double a[6];
double b;
double c[6];
double d[6];
double result;
int e;
int i;
int main()
{
printf("\n Enter the number to be converted : ");
scanf("%d",&a);
b = a[0]+a[1]/10+a[2]/100+a[3]/1000+a[4]/10000+a[5]/100000;
for ( i = 0; i < 6 ; i++)
{
d[i] = a[i]/8 ;
}
for (e = 0; e < 6; e++)
{
if (e==0)
{
c[e] = b%8 ;
}
if (e>0)
{
c[e] = d[e]%8;
}
result = c[5]+c[4]/10+c[3]/100+c[2]/1000+c[1]/10000+c[0]/100000;
printf("%d",result);
getchar();
}
return 0;
}