Error in code

Question

Hi friends,
I want to know that i have a some lines code that gave this error were the assignments of 9.0 to g.
  Float g = 9.0;
and
g = 9.0;
float is a floating point number yet the line which assigned the 9 value to f compiles correctly while the assignment of 9.0 to g doesn't! This is definitely counter intuitive! The error is
"Error 1 Literal of type double cannot be implicitly converted to type 'float'; use an 'F' suffix to create a literal of this type".