Floating Point Data Types Overview
A floating-point literal is of type float if it ends with the letter F or f, otherwise it is of type double and can optionally end with the letter D or d.
Double Type Literal
Let's declare a double floating point
double averageScore = 550.50; double totalScore = 975.05;
We could also have optionally prefixed the literal with the D or d, but this is usually omitted since its the default.
double averageScore = 550.50D; double totalScore = 975.05d;
Float Type Literal
The letter F or f is required when assigning literal values of the float type. If you miss the letter F or f, this will result in a syntax error.
float averageScore = 550.50F; //Here the letter F is required float totalScore = 975.05f; //Also here the letter f is required.
You can also use scientific notation for the literal value of the float.
float averageScore = 0.5505E3F; float totalScore = 0.97505e3f;
We can also use scientific notation in declaring literal values of type double.
double averageScore = 0.5505E3; //We left the D or d since its optional double totalScore = 0.97505e3;