Fibonacci program in C

#include<stdio.h>
int main()
{
 double a=0,b=0,c=0;
 double n;
 scanf("%dd", n);
 printf("%dd %dd",a,b);
 for(int i=0;i<n;i++)
 {
  c=a+b;
  printf("%dd",c);
  a=b;
  b=c;
 }
return 0;
}