double
  8 Byte
  2.3E-308 - 1.7E+308
  precision 15

You can use to find it out ;)

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
 
int main(void)
{
   printf("double: %d bytes\n", sizeof(double) );
   return 0;
}